The holder of an international registration with a request for an extension of protection to the United States shall be entitled to claim a date of priority based on a right of priority within the meaning of Article 4 of the Paris Convention for the Protection of Industrial Property if-
(1) the request for extension of protection contains a claim of priority; and
(2) the date of international registration or the date of the recordal of the request for extension of protection to the United States is not later than 6 months after the date of the first regular national filing (within the meaning of Article 4(A)(3) of the Paris Convention for the Protection of Industrial Property) or a subsequent application (within the meaning of Article 4(C)(4) of the Paris Convention for the Protection of Industrial Property).
(July 5, 1946, ch. 540, title XII, §67, as added