Can priority be claimed based on applications filed in regional patent offices?

Yes, applicants can claim priority under 35 U.S.C. 119(a)-(d) based on applications filed in certain foreign regional patent offices. The MPEP states: “In addition to the list of recognized countries set forth in subsection I, above, applicants may claim priority under 35 U.S.C. 119(a)-(d) to applications filed in foreign regional patent offices having member states…

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