26bis.1

a)   The applicant may correct a priority claim or add a priority claim to the request by a notice submitted to the receiving Office or the International Bureau within a time limit of 16 months from the priority date or, where the correction or addition would cause a change in the priority date, 16 months from the priority date as so changed, whichever 16-month period expires first, provided that such a notice may be submitted until the expiration of four months from the international filing date. The correction of a priority claim may include the addition of any indication referred to in Rule 4.10.

b)   Any notice referred to in paragraph a) received by the receiving Office or the International Bureau after the applicant has made a request for early publication under Article 21(2)b) shall be considered not to have been submitted, unless that request is withdrawn before the technical preparations for international publication have been completed.

c)   Where the correction or addition of a priority claim causes a change in the priority date, any time limit which is computed from the previously applicable priority date and which has not already expired shall be computed from the priority date as so changed.