View source for Patent Cooperation Treaty

{{EngvarB|date=October 2013}}
{{Use dmy dates|date=October 2013}}
{{Infobox treaty
| name                = Patent Cooperation Treaty
| long_name           = 
| image               = 
| image_width         = 
| caption             = 
| type                =
| date_drafted        =
| date_signed         = {{Start date|1970|06|19|df=y}}
| location_signed     = Washington, DC, US
| date_sealed         =
| date_effective      = 24 January 1978
| condition_effective = ratification by 8 States, 4 of which have significant patenting activity<ref>{{PCT Article|63}}</ref>
| date_expiration     =
| negotiators         = 
| signatories         = 36
| parties             = 152
| depositor           = Director-General of the [[World Intellectual Property Organization]] (WIPO)<ref>{{PCT Article|68}}</ref>
| languages           = English and French<ref>{{PCT Article|67}}</ref>
| wikisource          = 
}}
{{Patent Cooperation Treaty}}
The '''Patent Cooperation Treaty''' ('''PCT''') is an international patent law [[treaty]], concluded in 1970. It provides a unified procedure for filing [[patent application]]s to protect [[invention]]s in each of its contracting states. A patent application filed under the PCT is called an '''international application''', or '''PCT application'''.

A single filing of a PCT application is made with a Receiving Office (RO) in one language. It then results in a [[prior art|search]] performed by an International Searching Authority (ISA), accompanied by a written opinion regarding the [[patentability]] of the invention, which is the subject of the application. It is optionally followed by a '''preliminary examination''', performed by an International Preliminary Examining Authority (IPEA).<ref>{{PCT Article|32}}</ref> Finally, the relevant national or regional authorities administer matters related to the examination of application (if provided by national law) and issuance of patent.

A PCT application does not itself result in the grant of a patent, since there is no such thing as an "international patent", and the grant of patent is a prerogative of each national or regional authority.<ref name="Oxonica45">[http://www.bailii.org/ew/cases/EWHC/Patents/2008/2127.html ''Oxonica Energy Ltd v Neuftec Ltd (2008) EWHC 2127 (Pat)''], item 45.</ref> In other words, a PCT application, which establishes a filing date in all contracting states, must be followed up with the step of entering into national or regional phases to proceed towards grant of one or more patents. The PCT procedure essentially leads to a standard national or regional patent application, which may be granted or rejected according to applicable law, in each jurisdiction in which a patent is desired.

The contracting states,<ref name="ART1">{{PCT Article|1|1}}</ref> the states which are parties to the PCT, constitute the '''International Patent Cooperation Union'''.<ref name="ART1"/>

==History==
The Washington Diplomatic Conference on the Patent Cooperation Treaty was held in [[Washington, DC|Washington]] from 25 May to 19 June 1970. The Patent Cooperation Treaty was signed on the last day of the conference on 19 June 1970. The Treaty entered into force on 24 January 1978, initially with 18 contracting states.<ref name="25years">World Intellectual Property Organization, ''The First Twenty-five Years of the Patent Cooperation Treaty (PCT) 1970–1995'', 1995, ISBN 92-805-0601-3, page 141.</ref> The first international applications were filed on 1 June 1978.<ref name="25years"/> The Treaty was subsequently amended in 1979, and modified in 1984 and 2001.

==Accession==
[[File:Patent Cooperation Treaty.png|thumb|right|400px|Patent Cooperation Treaty members{{update after|2013|5|16}}<!--Saudi Arabia is missing-->]]
{{main|List of parties to the Patent Cooperation Treaty}}
Any contracting state to the [[Paris Convention for the Protection of Industrial Property]] can become a member of the PCT.<ref>{{PCT Article|62|1}}</ref>

A majority of the world's countries are parties to the PCT, including all of the major industrialised countries (with a few exceptions, including [[Argentina]], and [[Republic of China|Taiwan]]). As of 16 March 2017, there were 152 contracting states to the PCT. [[Jordan]] became the 152nd contracting state on 9 March 2017.<ref name="jordan">{{cite web|url=http://www.wipo.int/pct/en/pct_contracting_states.html|title=The PCT now has 152 Contracting States|publisher=WIPO|accessdate=16 March 2017}}</ref><ref name="PCT Newsletter No. 03/2017">{{cite web|url=http://www.wipo.int/pct/en/newslett/2017/article_0001.html|title=New PCT Contracting State; Jordan (country code: JO)|date=March 2017|work=PCT Newsletter No. 03/2017|publisher=WIPO|accessdate=19 March 2017}}</ref> The PCT will enter into force for Jordan on 9 June 2017.<ref name="jordan"/><ref name="PCT Newsletter No. 03/2017"/>

==Procedure==
The main advantages of the PCT procedure, also referred to as the international procedure, are the possibility to maximally delay: (a) the national or regional procedures; (b) the respective fees and translation costs; and, (c) the unified filing procedure.  From a practical standpoint, this could allow new ventures more time to locate strategic partnerships, funding, and markets, before their technology becomes public.

A PCT application (also called "international patent application") has two phases.<ref name=2013-part1>{{cite video |people=Matthias Reischle |date=19 August 2013 |title=Learn the PCT: Episode 1 - Introduction to the PCT System |url=https://www.youtube.com/watch?v=88Kpu4aL7Fs |publisher=WIPO |accessdate=13 February 2014 |minutes=13:13 to 14:20}}</ref> The first phase is the international phase in which patent protection is pending under a single patent application filed with the patent office of a contracting state of the PCT. The second phase is the national and regional phase which follows the international phase in which rights are continued by filing necessary documents with the patent offices of separate contracting states of the PCT.<ref name=2013-part1/><ref>[http://www.wipo.int/pct/guide/en/ "PCT Applicant's Guide"]</ref> A PCT application, as such, is not an actual request that a patent be granted, and it is not converted into one unless and until it enters the "national phase".<ref>[http://www.bailii.org/ew/cases/EWHC/Patents/2008/2127.html ''Oxonica Energy Ltd v Neuftec Ltd (2008) EWHC 2127 (Pat)''], item 19.</ref>

===Filing===
The first step of the procedure consists in filing an ''international (patent) application'' with a competent patent office, called a ''Receiving Office'' (RO). This application is called an ''international application'' or simply a ''PCT application'' since it does not result in an international patent nor in a PCT patent (neither of which exists). The PCT application needs to be filed in one language only, although translations may still be required for international search and international publication, depending on the language of filing and the International Searching Authority to be used. 

At least one applicant (either a [[person|physical]] or [[Juristic person|legal person]]) must be a national or [[dwelling|resident]] of a contracting state to the PCT; otherwise, no PCT filing date is accorded.<ref>{{PCT Article|9}}, {{PCT Rule|18|3}}</ref> If a PCT filing date is erroneously accorded, the Receiving Office may, within four months from the filing date, declare that the application should be considered withdrawn.<ref>{{PCT Article|14|4}} and {{PCT Rule|30}}; [http://www.wipo.int/edocs/pctndocs/en/2009/pct_news_2009_06.pdf Practical Advice: PCT application considered withdrawn by receiving Office after having been accorded a PCT filing date], [[PCT Newsletter]], June 2009, pp. 10–11.</ref> The requirement that at least one applicant must be a national or resident of a contracting state to the PCT needs, however, "only to be complied with at the time of filing the international application. Later changes in the applicant’s country of residence (or nationality) (...) have no consequence on the validity of the international application itself."<ref>{{cite web|url=http://www.wipo.int/pct/en/newslett/2016/article_0006.html |title=Practical Advice - Situation where the sole applicant, who is not a national of a PCT Contracting State, is no longer resident in a PCT Contracting State|date=February 2016|work=PCT NEWSLETTER No. 02/2016|publisher=WIPO|accessdate=21 February 2016}}</ref>

In most member states, the applicant or at least one of the applicants of the application is required to be a national or resident of the state of the receiving office where the application is filed. Applicants from any contracting state may file a PCT application at the International Bureau in Geneva,<ref>{{PCT Rule|19}}</ref> subject to national security provisions.<ref>{{PCT Article|27|8}}; {{cite web|url=http://www.wipo.int/pct/en/newslett/2014/article_0011.html|title=Practical Advice: The need to take into account national security provisions when filing a PCT application|date=June 2014|work=PCT Newsletter, No. 06/2014|publisher=WIPO|accessdate=28 June 2014}}</ref>

Upon filing of the PCT application, all contracting states are automatically designated.{{#tag:ref|Applicable as from 1 January 2004.|group=notes}}{{#tag:ref|Germany, Japan, and the [[South Korea|Republic of Korea]] can be excluded from this all inclusive designation, if priority is claimed from an earlier national filing in the state concerned. See {{PCT Rule|4|9|b}} notifications of incompatibility in {{cite web|url=http://www.wipo.int/pct/en/texts/reservations/res_incomp.html|title=PCT Reservations, Declarations, Notifications and Incompatibilities (status on 18 September 2015)|publisher=WIPO|accessdate=10 June 2016}}|group=notes}} Subject to reservations made by any contracting state, a PCT application fulfilling the requirements of the treaty and accorded a PCT filing date has the effect of a regular national application in each designated state as of the PCT filing date, which date is considered to be the actual filing date in each designated State.<ref>{{PCT Article|11|3}}.</ref> However, in some countries, the prior effect of a PCT application filed outside such countries may be different from the prior effect of a domestic application.
{| style="float:right; margin:1em 1em 1em 1em; width:22em; border: 1px solid #a0a0a0; padding: 10px; background-color: #F5F5F5; text-align:left;"
|- style="text-align:center;"
|'''International Searching Authorities (ISA) and International Preliminary Examining Authorities (IPEA)'''<ref>[[World Intellectual Property Organization]], [http://www.wipo.int/pct/guide/en/ ''The PCT Applicant's Guide (Last updated 22 March 2013)'']</ref>
|- style="text-align:left; font-size:x-small;"
|1. '''Austrian Patent Office''' (AT).
|- style="text-align:left; font-size:x-small;"
|2. '''[[IP Australia|Australian Patent Office]]''' (AU).
|- style="text-align:left; font-size:x-small;"
|3. '''National Institute of Industrial Property''' (BR).<ref name="BR-ISA-and-IPEA">It began functioning as an ISA and IPEA with effect from 7 August 2009, in [[World Intellectual Property Organization]], [http://www.wipo.int/edocs/pctndocs/en/2009/pct_news_2009_07.pdf ''National Institute of Industrial Property (Brazil) to Begin Functioning as International Searching and Preliminary Examining Authority''], [[PCT Newsletter]], 07-08/2009</ref>
|- style="text-align:left; font-size:x-small;"
|4. '''[[Canadian Intellectual Property Office]]''' (CA).
|- style="text-align:left; font-size:x-small;"
|5. '''National Institute of Industrial Property of Chile''' (CL)<ref>{{cite web|url=http://www.wipo.int/pct/en/newslett/2014/article_0002.html|title=National Institute of Industrial Property (Chile) to Begin Operating as an International Searching and Preliminary Examining Authority|date=June 2014|work=PCT Newsletter No. 06/2014|publisher=WIPO|accessdate=28 June 2014}}</ref><ref name=PCT-Newsletter-10-2014-p1/>
|- style="text-align:left; font-size:x-small;"
|6. '''[[State Intellectual Property Office of the People's Republic of China]]''' (CN).
|- style="text-align:left; font-size:x-small;"
|7. '''Egyptian Patent Office''' (EG).<ref>[http://www.wipo.int/edocs/pctndocs/en/2013/pct_news_2013_03.pdf Egyptian Patent Office to Begin Operating as an International Searching and Preliminary Examining Authority], [[PCT Newsletter]], March 2013, p. 4.</ref>
|- style="text-align:left; font-size:x-small;"
|8. '''[[European Patent Office]]''' (EP).
|- style="text-align:left; font-size:x-small;"
|9. '''[[Spanish Patent and Trademark Office]]''' (ES).
|- style="text-align:left; font-size:x-small;"
|10. '''National Board of Patents and Registration of Finland''' (FI).
|- style="text-align:left; font-size:x-small;"
|11. '''[[Indian Patent Office]]''' (IN).<ref>{{cite web |url=http://www.wipo.int/pct/guide/en/gdvol1/annexes/annexc/ax_c_in.pdf |title=PCT Applicant's Guide – International Phase – Annex C, Receiving Offices, Indian Patent Office |date=1 October 2013 |website=WIPO |accessdate=8 October 2013}}</ref><ref name=PCT-Newsletter-10-2013-p2>[http://www.wipo.int/edocs/pctndocs/en/2012/pct_news_2012_04.pdf Indian Patent Office to Begin Operating as an International Searching and Preliminary Examining Authority], [[PCT Newsletter]], October 2013, p. 2.</ref>
|- style="text-align:left; font-size:x-small;"
|12. '''[[Israel Patent Office]]''' (IL).<ref>[http://www.wipo.int/edocs/pctndocs/en/2012/pct_news_2012_04.pdf Israel Patent Office to Begin Operating as an International Searching and Preliminary Examining Authority], [[PCT Newsletter]], April 2012, p. 3.</ref>
|- style="text-align:left; font-size:x-small;"
|13. '''[[Japan Patent Office]]''' (JP).
|- style="text-align:left; font-size:x-small;"
|14. '''[[Korean Intellectual Property Office]]''' (KR).
|- style="text-align:left; font-size:x-small;"
|15. '''[[Rospatent|Federal Service for Intellectual Property (Rospatent) (Russian Federation)]]''' (RU).
|- style="text-align:left; font-size:x-small;"
|16. '''[[Swedish Patent and Registration Office]]''' (SE).
|- style="text-align:left; font-size:x-small;"
|17. '''[[Intellectual Property Office of Singapore]]''' (SG)<ref name=PCT-Newsletter-10-2014-p1>[http://www.wipo.int/edocs/pctndocs/en/2014/pct_news_2014_10.pdf Assembly of the PCT Union], [[PCT Newsletter]], October 2014, p. 1.</ref><ref>{{cite journal|date=July 2015|title=Intellectual Property Office of Singapore to Begin Operating as ISA, SISA and IPEA|journal=[[PCT Newsletter]]|publisher=WIPO|issue=07-08/2015|url=http://www.wipo.int/pct/en/newslett/2015/article_0001.html}}</ref>
|- style="text-align:left; font-size:x-small;"
|18. '''''[[Turkish Patent Institute]]''''' (TPI)<ref>{{cite journal|date=October 2016|title=Assembly of the PCT Union|journal=[[PCT Newsletter]]|publisher=WIPO|volume=2016|issue=10|page=1|url=http://www.wipo.int/edocs/pctndocs/en/2016/pct_news_2016_10.pdf}}</ref> (will begin operating as ISA and IPEA with effect from 8 March 2017)<ref>{{cite journal|date=February 2017|title=Turkish Patent and Trademark Office (Turkpatent) to Begin Operating as an International Searching and Preliminary Examining Authority|journal=PCT Newsletter|publisher=WIPO|volume=2017|issue=02|url=http://www.wipo.int/edocs/pctndocs/en/2017/pct_news_2017_2.pdf}}</ref>
|- style="text-align:left; font-size:x-small;"
|19. '''State Intellectual Property Service of Ukraine''' (UA).<ref name=PCT-Newsletter-10-2013-p1>[http://www.wipo.int/edocs/pctndocs/en/2013/pct_news_2013_10.pdf Assembly of the PCT Union], [[PCT Newsletter]], October 2013, p. 1.</ref><ref>{{cite journal|date=January 2016|title=State Intellectual Property Service of Ukraine (SIPSU) to Begin Operating as an International Searching and Preliminary Examining Authority|journal=[[PCT Newsletter]]|publisher=WIPO|volume=2016|issue=01|page=1|url=http://www.wipo.int/edocs/pctndocs/en/2016/pct_news_2016_1.pdf}}</ref>
|- style="text-align:left; font-size:x-small;"
|20. '''[[United States Patent and Trademark Office]]''' (US).
|- style="text-align:left; font-size:x-small;"
|21. '''[[Nordic Patent Institute]]''' (XN).
|- style="text-align:left; font-size:x-small;"
|22. '''[[Visegrad Patent Institute]]''' (XV).<ref>{{cite web|url=http://www.wipo.int/edocs/pctndocs/en/2016/pct_news_2016_5.pdf|title=Visegrad Patent Institute to Begin Operating as an International Searching and Preliminary Examining Authority|publisher=WIPO|page=4|accessdate=11 June 2016}}</ref>
|- style="text-align:left; font-size:x-small;"
|Note 1: All International Searching Authorities are also International Preliminary Examining Authorities.
|- style="text-align:left; font-size:x-small;"
|}

===Search and written opinion===
A search or ''international search'' is then made by an authorised ''International Searching Authority'' (ISA) to find the most relevant [[prior art]] documents regarding the claimed subject matter. The search results in an ''International Search Report'' (ISR), together with a written opinion regarding [[patentability]].<ref>The written opinion is established by the International Searching Authority (ISA) for international applications filed on or after 1 January 2004 only.</ref> The ISA(s) that the applicant can choose depends on the receiving Office with which the applicant filed the international application.<ref name="Practical advice 06/2013">{{cite journal |title=Practical advice: Filing a demand with an International Authority which is not the Authority which carried out the international search |journal=PCT Newsletter |issue=06/2013 |pages=9–11 |publisher=WIPO |url=http://www.wipo.int/edocs/pctndocs/en/2013/pct_news_2013_6.pdf |accessdate=14 June 2013}}</ref> In 2013, the most selected ISAs were the [[European Patent Office]] (EPO) (with 37.7% of all ISRs issued), followed by the [[Japan Patent Office]] (JPO) (20.7%) and the [[Korean Intellectual Property Office]] (KIPO) (14.8%).<ref>{{cite web|url=http://www.wipo.int/export/sites/www/freepublications/en/patents/901/wipo_pub_901_2014.pdf|title=Patent Cooperation Treaty Yearly Review - The International Patent System|year=2014|publisher=World Intellectual Property Organization|page=68|isbn=978-92-805-2499-4|accessdate=13 July 2014}}</ref>

The ISR is supposed to be provided by the ISA to the applicant 9 months after filing of the application in the event of a first filing and 16 months after the [[priority right|priority date]] in the event of a subsequent filing (i.e., claiming the priority of a first filing). However, long delays may occur,{{vague|Under which circumstances? For which International Searching Authorities?|date=May 2012}} even to the point where the ISR is not received by the 30/31-month national phase deadline.{{citation needed|date=May 2012}}

The ISR is published together with the PCT application (or as soon as possible afterwards). The written opinion is initially confidential, but unless it is superseded by an ''International Preliminary Examination Report'' (see optional examination, below), it is made available in the form of an ''International Preliminary Report on Patentability'' (Chapter I of the Patent Cooperation Treaty, or IPRP Chapter I), within 30 months of the filing date or a priority date, if any.<ref>{{PCT Rule|44bis|1|b}}</ref> If the ISR is not in English, it is translated into English for publication.<ref>{{PCT Rule|45|1}}</ref> A designated Office may require a translation of the IPRP Chapter I into English.<ref>{{PCT Rule|44bis|3}}</ref>

The international search report can help the applicant decide whether it would be worthwhile seeking national protection, and if so, in how many countries, as fees and other expenses, including translation costs, must be paid to enter the national phase in each country. Yet another advantage of filing a PCT application under the PCT is that many national patent authorities will rely on the international search report (although the PCT does not obligate them to do so) instead of performing a prior art search themselves, and the applicant may thus be able to save search fees.<ref name="Oxonica46">[http://www.bailii.org/ew/cases/EWHC/Patents/2008/2127.html ''Oxonica Energy Ltd v Neuftec Ltd (2008) EWHC 2127 (Pat)''], item 46.</ref>

In addition to the compulsory international search, at least one optional supplementary international search may also be carried out by participating International Searching Authorities,<ref>namely, an International Searching Authority which is competent to do so under {{PCT Rule|45bis|9}}</ref> upon request by the applicant<ref>{{PCT Rule|45bis|1|a}}</ref> and payment of corresponding fees.<ref>{{PCT Rule|45bis|2 and 3}}</ref> The purpose is to reduce the likelihood of seeing new prior art being cited in the subsequent national phases.<ref name="sis">WIPO web site, [http://www.wipo.int/pct/en/texts/ppt/2009changes.ppt ''Amendments to the PCT Regulations as from 1 January 2009''], undated. Consulted on 17 October 2009. See also [http://www.wipo.int/edocs/pctndocs/en/2012/pct_news_2012_01.pdf Practical Advice: The benefits of requesting supplementary international search], [[PCT Newsletter]], No. 01/2012 (January 2012), pp. 10–11.</ref> A supplementary international search is said to allow applicants to obtain an additional search report "taking into account the growing linguistic diversity of the prior art being found".<ref name="sis"/> In 2009 and 2010, the demand for supplementary international searches was relatively low.<ref>[http://www.wipo.int/meetings/en/doc_details.jsp?doc_id=157837 Supplementary International Search], PCT/MIA/18/10, 24 February 2011 (Document prepared by WIPO's International Bureau). Consulted on 15 April 2011.</ref>

===Publication===
The PCT application is published by the International Bureau at the [[WIPO]], based in [[Geneva]], [[Switzerland]], in one of the ten "languages of publication": [[Arabic language|Arabic]], Chinese, English, French, German, Japanese, [[Korean language|Korean]], [[Portuguese language|Portuguese]], Russian, and Spanish.<ref>{{PCT Rule|48|3}}</ref> The publication normally takes place promptly after 18 months from the filing date or, if a priority is claimed, from the earliest priority date.<ref>{{PCT Article|21|2|a}}</ref><ref name="PCT Newsletter 2016-10">{{cite journal|date=October 2016|title=Practical Advice - Requesting early publication of an international application|journal=[[PCT Newsletter]]|publisher=WIPO|volume=2016|issue=10|pages=8-11|url=http://www.wipo.int/edocs/pctndocs/en/2016/pct_news_2016_10.pdf}}</ref> There are two exceptions to this rule, however. First, a PCT application may be published earlier if the applicant requests early publication.<ref name="PCT Newsletter 2016-10"/><ref>{{PCT Article|21|2|b}}</ref> Secondly, if 18 months after the priority date, the PCT application designates only the United States, then the application is not automatically published.<ref>{{PCT Article|64|3}}, [http://www.wipo.int/pct/en/texts/reservations/res_incomp.pdf PCT Reservations, Declarations, Notifications and Incompatibilities]</ref>

From the publication of the PCT application until 28 months after the priority date, any third party may file observations regarding the novelty and inventive step of the invention. The observations may be submitted anonymously, and no fee is due for filing such observations.<ref>{{cite mailing list |url=http://www.wipo.int/wilma/pct-general/201207/msg00000.html |title=PCT Newsletter Update |date=4 July 2012  |accessdate=29 July 2012 |mailinglist=PCT Newsletter mailing list}}</ref><ref>{{cite web |url=http://www.wipo.int/pct/en/texts/ai/s801.html |title=Administrative Instructions under the Patent Cooperation Treaty, Part 8: Instructions Relating to Observations by Third Parties, Section 801: Third Party Observation System |work=Administrative Instructions under the Patent Cooperation Treaty, as in force from July 1, 2012 |publisher=WIPO |accessdate=29 July 2012}}</ref><ref>[http://www.wipo.int/edocs/pctndocs/en/2012/pct_news_2012_08.pdf Practical Advice, Making third party observations], [[PCT Newsletter]], July–August 2012, No. 07-08/2012, pp. 17–19.</ref>

===Optional examination===
An ''international preliminary examination'' may optionally be requested ("demanded").<ref>The international preliminary examination may start before the publication of the PCT application if the applicant has expressly requested an earlier start. See WIPO, [http://www.wipo.int/export/sites/www/pct/en/texts/pdf/ispe.pdf ''PCT International Search and Preliminary Examination Guidelines (Guidelines for the Processing by International Searching and Preliminary Examining Authorities of International Applications Under the Patent Cooperation Treaty) as in force from March 25, 2004''], Page 25, "''Commencement of International Preliminary Examination: ... The International Preliminary Examining Authority normally starts the international preliminary examination when: ... (b) the time limit within which the applicant was permitted to file the demand ... has expired, or earlier if the applicant has expressly requested an earlier start''".</ref><ref name="Practical-Advice-04/2010"> [http://www.wipo.int/edocs/pctndocs/en/2010/pct_news_2010_04.pdf "Factors to be considered when deciding whether or not to file a demand for international preliminary examination" (Views of David Reed), Practical Advice, PCT Newsletter No. 04/2010], page 8ff.</ref> The international preliminary examination is conducted by an authorised ''International Preliminary Examination Authority'' (IPEA) and its objective is "to formulate a preliminary and non-binding opinion on the questions whether the claimed invention appears to be novel, to involve an inventive step (to be non-obvious), and to be industrially applicable".<ref>{{PCT Article|33|1}}</ref> This results in an ''International Preliminary Examination Report'' (IPER). Since 2004, the IPER bears the title "''international preliminary report on patentability (Chapter II of the Patent Cooperation Treaty)''" (commonly abbreviated "''IPRP Chapter II''").<ref>{{PCT Rule|70|15|b}}</ref> The filing of a demand for international preliminary examination, which must be done within a time limit,<ref>{{PCT Article|31|5}} and {{PCT Rule|54bis}}</ref> is subject to the payment of a "handling fee" for the benefit of the International Bureau<ref>{{PCT Rule|57}}</ref> and a "preliminary examination fee" for the benefit of the IPEA.<ref>{{PCT Rule|58}}</ref> The cost of filing a demand varies depending on the IPEA used by the applicant.<ref name="Practical advice 06/2013"/><ref name="Practical-Advice-04/2010"/> The IPEA(s) that the applicant can choose however depends on the receiving Office with which the applicant filed the PCT application (the same applies to ISAs).<ref name="Practical advice 06/2013"/>

If the written opinion established by the International Searching Authority (ISA) is positive, "there is little value to be obtained from filing a demand".<ref name="Practical-Advice-04/2010"/> However, "[for] cases where the written opinion of the ISA contains negative findings, the savings in the applicant's/agent's time and, where applicable, agent's fees, required by multiple responses to national offices may well justify the use of the Chapter II procedure."<ref name="Practical-Advice-05/2010"> [http://www.wipo.int/edocs/pctndocs/en/2010/pct_news_2010_05.pdf "Factors to be considered when deciding whether or not to file a demand for international preliminary examination – Part 2" (Views of David Reed), Practical Advice, PCT Newsletter No. 05/2010], page 8ff.</ref> There are many advantages, such as cost and effort savings ("as well as possibly shortened pendency/faster grants"<ref name="Practical-Advice-05/2010"/>), in receiving a favourable IPRP Chapter II, i.e. a favourable report following an international preliminary examination.<ref name="Practical-Advice-05/2010"/> For instance, national offices "with a smaller examining staff and those without examiners tend to rely more heavily on the results in the IPRP Chapter II".<ref name="Practical-Advice-05/2010"/>

When an examination is demanded, the contracting states for which the examination is demanded are called ''Elected Offices'' (under ''Chapter II''), otherwise they are called ''Designated Offices'' (under ''Chapter I''). The ''election'' of a contracting state correspondingly means electing it when demanding (requesting) the examination.

An alternative to the filing of a demand for international preliminary examination is to file informal comments in response to the written opinion established by the ISA. These informal comments are not published. The informal comments should be submitted to the International Bureau (IB), and not to the ISA or the IPEA.<ref name="Practical-Advice-10/2004">[http://www.wipo.int/pct/en/newslett/practical_advice/pa_102004.html ''PCT Newsletter'' 10/2004: Practical Advice]. Consulted on 25 April 2010.</ref> They are kept in the file of the PCT application and, in the case where no demand is filed, forwarded to the designated offices,<ref name="Practical-Advice-04/2010"/><ref name="Practical-Advice-10/2004"/> which are free to require a translation of the informal comments.<ref name="Practical-Advice-10/2004"/>

===Subject matter===
The PCT does not make any specific provision concerning the types of invention which may be the subject of an international application. Rules 39 and 67 permit International Searching and Preliminary Examining Authorities not to carry out search and examination on certain types of subject matter, such as scientific and mathematical theories, methods of doing business and computer programs to the extent that the Authority is not equipped to carry out a search or international preliminary examination concerning such programs. However, while a lack of international search may make national processing more difficult, {{PCT Article|27|5}} makes clear that this does not affect the issue of whether the invention is patentable under the laws of the designated States:
:"Nothing in this Treaty and the Regulations is intended to be construed as prescribing anything that would limit the freedom of each contracting state to prescribe such substantive conditions of patentability as it desires. (...)"

===National and regional phase===
Finally, at 30 months<ref>The 30-month time limit to enter the national phase is not applicable to all countries. A small number of countries still request the entering of the national phase under Chapter I (i.e., if the preliminary examination is not demanded or not demanded in time) at 20 months. Consult this [http://www.wipo.int/pct/en/texts/pdf/time_limits.pdf chart] for national phase entry deadlines for specific countries or regions.</ref> from the filing date of the PCT application or from the earliest priority date of the application if a priority is claimed, the international phase ends and the PCT application enters in national and regional phase. However, any national law may fix time limits which expire later than 30 months. For instance, it is possible to enter the European regional phase at 31 months from the earliest priority date. National and regional phases can also be started earlier on the express request of the applicant, even before publication of the international application.<ref>{{PCT Article|20|3}} or {{PCT Article|40|2}}; [http://www.wipo.int/edocs/pctndocs/en/2011/pct_news_2011_10.pdf Entering the national phase early where the PCT application has not yet been published], Practical Advice, [[PCT Newsletter]] No. 10/2011, page 15ff.</ref>

If the entry into national or regional phase is not performed within the prescribed time limit, the PCT application generally ceases to have the effect of a national or regional application.<ref>{{PCT Article|24|1|iii}}</ref>

==Statistics==
The millionth PCT application was filed at the end of 2004,<ref>WIPO web site, [http://www.wipo.int/pct/en/million/ PCT One Million and Counting]</ref> whereas the two millionth application was filed in 2011.<ref>[http://www.wipo.int/edocs/pctndocs/en/2011/pct_news_2011_04.pdf Two Millionth PCT Application Filed], [[PCT Newsletter]], April 2011, No. 04/2011, p. 1.</ref> The first ever decline in the number of filed PCT applications in over 30 years occurred in 2009, with a 4.5 percent drop compared to 2008.<ref>Kaitlin Mara, [http://www.ip-watch.org/weblog/2010/02/08/first-ever-drop-in-filings-under-patent-cooperation-treaty-in-2009/ ''First-Ever Drop In Filings Under Patent Cooperation Treaty Seen In 2009 ''], [[Intellectual Property Watch]], 8 February 2010. Consulted on 18 February 2010.</ref> In 2013, about 205,000 international applications were filed, making 2013 the first year during which more than 200,000 PCT applications were filed in one year.<ref>{{cite web|url=http://www.wipo.int/export/sites/www/freepublications/en/patents/901/wipo_pub_901_2014.pdf|title=Patent Cooperation Treaty Yearly Review - The International Patent System|year=2014|publisher=World Intellectual Property Organization|page=29|isbn=978-92-805-2499-4|accessdate=13 July 2014}}</ref> The 3 millionth PCT application was published on 2 February 2017.<ref>{{cite web|url=http://www.wipo.int/pct/en/newslett/2017/article_0001.html|title=Three Million PCT Applications Published|date=February 2017|work=PCT Newsletter 02/2017|publisher=WIPO|accessdate=17 February 2017}}</ref> WIPO provides regular updated statistics on its website.

==See also==
* [[European Patent Organisation]] (EPO)
* [[Eurasian Patent Organization]] (EAPO)
* [[Patent Law Treaty]] (PLT)
* [[Substantive Patent Law Treaty]] (SPLT)

==Notes==
{{reflist|group=notes}}

== References==
{{Reflist|30em}}

==Further reading==
* Cees Mulder, ''The Cross-Referenced Patent Cooperation Treaty'', updated yearly, Helze Publisher. [http://www.helze.com]
* Peter Watchorn and Andrea Veronese, ''PCT Procedures and Passage into the European Phase'', Kastner AG, 2nd Edition, 2010, ISBN 978-3-941951-11-2 [http://www.pct-compass.com].

==External links==
* The full text of the [http://www.wipo.int/wipolex/en/treaties/text.jsp?file_id=288637 Patent Cooperation Treaty] {{ref-en}} in the [[WIPO Lex]] database — official website of [[WIPO]].
* [http://www.wipo.int/pct/en/ Patent Cooperation Treaty resources] on the [[WIPO]] web site.

[[Category:Patent law treaties]]
[[Category:Patent Cooperation Treaty|*]]
[[Category:World Intellectual Property Organization treaties]]
[[Category:Treaties concluded in 1970]]
[[Category:Treaties entered into force in 1978]]
[[Category:Treaties of Albania]]
[[Category:Treaties of Algeria]]
[[Category:Treaties of Antigua and Barbuda]]
[[Category:Treaties of Armenia]]
[[Category:Treaties of Australia]]
[[Category:Treaties of Austria]]
[[Category:Treaties of Azerbaijan]]
[[Category:Treaties of Barbados]]
[[Category:Treaties of Belarus]]
[[Category:Treaties of Belgium]]
[[Category:Treaties of Belize]]
[[Category:Treaties of the People's Republic of Benin]]
[[Category:Treaties of Bosnia and Herzegovina]]
[[Category:Treaties of Botswana]]
[[Category:Treaties of the Brazilian military government]]
[[Category:Treaties of the People's Republic of Bulgaria]]
[[Category:Treaties of Burkina Faso]]
[[Category:Treaties of Cameroon]]
[[Category:Treaties of Canada]]
[[Category:Treaties of the Central African Republic]]
[[Category:Treaties of Chad]]
[[Category:Treaties of the People's Republic of China]]
[[Category:Treaties of Colombia]]
[[Category:Treaties of the Comoros]]
[[Category:Treaties of the Republic of the Congo]]
[[Category:Treaties of Costa Rica]]
[[Category:Treaties of Ivory Coast]]
[[Category:Treaties of Croatia]]
[[Category:Treaties of Cuba]]
[[Category:Treaties of Cyprus]]
[[Category:Treaties of Czechoslovakia]]
[[Category:Treaties of the Czech Republic]]
[[Category:Treaties of Denmark]]
[[Category:Treaties of Djibouti]]
[[Category:Treaties of Dominica]]
[[Category:Treaties of Ecuador]]
[[Category:Treaties of Egypt]]
[[Category:Treaties of El Salvador]]
[[Category:Treaties of Equatorial Guinea]]
[[Category:Treaties of Estonia]]
[[Category:Treaties of Finland]]
[[Category:Treaties of France]]
[[Category:Treaties of Gabon]]
[[Category:Treaties of the Gambia]]
[[Category:Treaties of Georgia (country)]]
[[Category:Treaties of West Germany]]
[[Category:Treaties of Ghana]]
[[Category:Treaties of Greece]]
[[Category:Treaties of Grenada]]
[[Category:Treaties of Guatemala]]
[[Category:Treaties of Guinea]]
[[Category:Treaties of Guinea-Bissau]]
[[Category:Treaties of Honduras]]
[[Category:Treaties extended to Hong Kong]]
[[Category:Treaties of the Hungarian People's Republic]]
[[Category:Treaties of Iceland]]
[[Category:Treaties of India]]
[[Category:Treaties of Indonesia]]
[[Category:Treaties of Ireland]]
[[Category:Treaties of Israel]]
[[Category:Treaties of Italy]]
[[Category:Treaties of Japan]]
[[Category:Treaties of Kazakhstan]]
[[Category:Treaties of Kenya]]
[[Category:Treaties of North Korea]]
[[Category:Treaties of South Korea]]
[[Category:Treaties of Kuwait]]
[[Category:Treaties of Kyrgyzstan]]
[[Category:Treaties of Laos]]
[[Category:Treaties of Latvia]]
[[Category:Treaties of Lesotho]]
[[Category:Treaties of Liberia]]
[[Category:Treaties of the Libyan Arab Jamahiriya]]
[[Category:Treaties of Liechtenstein]]
[[Category:Treaties of Lithuania]]
[[Category:Treaties of Luxembourg]]
[[Category:Treaties of the Republic of Macedonia]]
[[Category:Treaties of Madagascar]]
[[Category:Treaties of Malawi]]
[[Category:Treaties of Malaysia]]
[[Category:Treaties of Mali]]
[[Category:Treaties of Mauritania]]
[[Category:Treaties of Mexico]]
[[Category:Treaties of Moldova]]
[[Category:Treaties of Monaco]]
[[Category:Treaties of the Mongolian People's Republic]]
[[Category:Treaties of Montenegro]]
[[Category:Treaties of Morocco]]
[[Category:Treaties of Mozambique]]
[[Category:Treaties of Namibia]]
[[Category:Treaties of the Netherlands]]
[[Category:Treaties of New Zealand]]
[[Category:Treaties of Nicaragua]]
[[Category:Treaties of Niger]]
[[Category:Treaties of Nigeria]]
[[Category:Treaties of Norway]]
[[Category:Treaties of Oman]]
[[Category:Treaties of Papua New Guinea]]
[[Category:Treaties of the Philippines]]
[[Category:Treaties of Poland]]
[[Category:Treaties of Portugal]]
[[Category:Treaties of the Socialist Republic of Romania]]
[[Category:Treaties of the Soviet Union]]
[[Category:Treaties of Saint Kitts and Nevis]]
[[Category:Treaties of Saint Lucia]]
[[Category:Treaties of Saint Vincent and the Grenadines]]
[[Category:Treaties of San Marino]]
[[Category:Treaties of Senegal]]
[[Category:Treaties of Serbia and Montenegro]]
[[Category:Treaties of Yugoslavia]]
[[Category:Treaties of Saudi Arabia]]
[[Category:Treaties of Seychelles]]
[[Category:Treaties of Sierra Leone]]
[[Category:Treaties of Singapore]]
[[Category:Treaties of Slovakia]]
[[Category:Treaties of Slovenia]]
[[Category:Treaties of South Africa]]
[[Category:Treaties of Spain]]
[[Category:Treaties of Sri Lanka]]
[[Category:Treaties of the Democratic Republic of the Sudan]]
[[Category:Treaties of Swaziland]]
[[Category:Treaties of Sweden]]
[[Category:Treaties of Switzerland]]
[[Category:Treaties of Syria]]
[[Category:Treaties of Tajikistan]]
[[Category:Treaties of Tanzania]]
[[Category:Treaties of Thailand]]
[[Category:Treaties of Togo]]
[[Category:Treaties of Trinidad and Tobago]]
[[Category:Treaties of Tunisia]]
[[Category:Treaties of Turkey]]
[[Category:Treaties of Turkmenistan]]
[[Category:Treaties of Uganda]]
[[Category:Treaties of Ukraine]]
[[Category:Treaties of the United Arab Emirates]]
[[Category:Treaties of the United Kingdom]]
[[Category:Treaties of the United States]]
[[Category:Treaties of Uzbekistan]]
[[Category:Treaties of Vietnam]]
[[Category:Treaties of Zambia]]
[[Category:Treaties of Zimbabwe]]
[[Category:1970 in Washington, D.C.]]
[[Category:Treaties extended to Greenland]]
[[Category:Treaties extended to the Faroe Islands]]
[[Category:Treaties extended to American Samoa]]
[[Category:Treaties extended to Baker Island]]
[[Category:Treaties extended to Guam]]
[[Category:Treaties extended to Howland Island]]
[[Category:Treaties extended to Jarvis Island]]
[[Category:Treaties extended to Johnston Atoll]]
[[Category:Treaties extended to Kingman Reef]]
[[Category:Treaties extended to Midway Atoll]]
[[Category:Treaties extended to Navassa Island]]
[[Category:Treaties extended to the Trust Territory of the Pacific Islands]]
[[Category:Treaties extended to Palmyra Atoll]]
[[Category:Treaties extended to Puerto Rico]]
[[Category:Treaties extended to the United States Virgin Islands]]
[[Category:Treaties extended to Wake Island]]
[[Category:Treaties extended to the Netherlands Antilles]]
[[Category:Treaties extended to Aruba]]
[[Category:Treaties extended to the Panama Canal Zone]]
[[Category:Treaties extended to the Isle of Man]]
[[Category:Treaties extended to British Hong Kong]]
[[Category:Treaties extended to French Guiana]]
[[Category:Treaties extended to French Polynesia]]
[[Category:Treaties extended to the French Southern and Antarctic Lands]]
[[Category:Treaties extended to Guadeloupe]]
[[Category:Treaties extended to Martinique]]
[[Category:Treaties extended to Mayotte]]
[[Category:Treaties extended to New Caledonia]]
[[Category:Treaties extended to Réunion]]
[[Category:Treaties extended to Saint Pierre and Miquelon]]
[[Category:Treaties extended to Wallis and Futuna]]