Can I claim priority to a foreign application after my U.S. patent has been issued?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-09 10 Rules 5 Related FAQs This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice. Yes, it is possible to claim priority to a foreign application after your U.S. patent has been issued. According to MPEP 216.01 , a claim for priority under 35 U.S.C. 119(a)-(d) or (f) can be made after the patent is granted, subject to certain conditions: The claim must be made within the time period set forth in 37 CFR 1.55(g). A petition to accept an unintentionally delayed claim for priority must be filed. The required fee must be paid. A certified copy of the foreign application must be submitted. The MPEP states: ‘A claim for priority under 35 U.S.C. 119(a)-(d) or (f) for the benefit of a prior foreign application may be made after the patent issues if the claim is accompanied by a grantable petition to accept an unintentionally delayed claim for priority.’ Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Claim to Foreign Priority After Patent Issuance MPEP 216.01 Requirement for Certified Copy of Foreign Application MPEP 216.01 Permitted Petition for Unintentionally Delayed Foreign Priority Claim MPEP 216.01 Permitted Priority Claim and Certified Copy Must Be Filed During Pendency MPEP 216.01 Required Requirement for Perfecting Foreign Priority Claim After Patent Issuance MPEP 216.01 Permitted Examiner Must Study Certified Copy for Priority Date MPEP 216 Examiner Reviews Certified Copy for Priority Date MPEP 216 Permitted Claim to Foreign Priority in Continuing Application Constitutes Affirmation of Prior Expression for Subject Matter Commonality MPEP 216.01 Claim to Foreign Priority Benefits Through Reissue MPEP 216.01 Permitted Claim to Foreign Priority Benefits Must Be Perfected by Reissue Application MPEP 216.01 Prohibited Other Related FAQs 5 FAQs Col...