PCT AG-IP 5.060 What are the principles governing the right of priority for international applications?

Article 8(1)
and (2)(a)
Rule 4.10

5.060.   What are the principles governing the right of priority for international applications?  The PCT makes no change to the provisions which govern the right of priority and are contained in Article 4 of the Paris Convention for the Protection of Industrial Property;  WTO members are required to apply Paris Convention Article 4 in accordance with Article 2.1 of the Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS Agreement).  Since an international application has the effect in each designated State of a regular national application, it may claim priority from another application, and be used as the basis for a priority claim in a later application, just like any regular national application.  So far as PCT procedures are concerned, the priority claim is particularly important because it establishes a priority date for the purposes of computing time limits under the PCT.  The validity of a priority claim is not determined during the international phase (although the matter is taken into consideration for the purposes of establishing international preliminary reports on patentability (Chapter I or II of the PCT)).  Also, a priority claim would, subject to the possibility of correction (see paragraphs 6.038 to 6.044), for the purposes of the procedure under the PCT, be considered not to have been made if the application, the priority of which is claimed, was not filed either in a country party to the Paris Convention or in a member of the WTO, if the international application were filed more than two months after the expiration of the priority period (see paragraphs 5.062 and 6.038) or if the priority claim did not include the required details concerning the date on which and the country and/or Office, as the case may be, where the earlier application was filed. 

Source: http://www.wipo.int/pct/en/appguide/text.jsp?page=ip05.html

Date retrieved: 02 November 2015

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PCT Applicant's Guide - International Phase