What is an unintentionally delayed priority claim?

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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. An unintentionally delayed priority claim occurs when a claim for foreign priority under 35 U.S.C. 119(a) through (d) or (f), 365(a) or (b), or 386(a) or 386(b) is not presented within the time period provided by 37 CFR 1.55(d) . In such cases, the claim is considered to have been waived but may be accepted if the delay was unintentional. As stated in the MPEP: “If a claim for priority is considered to have been waived under this section, the claim may be accepted if the priority claim was unintentionally delayed.” Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Claim for Foreign Priority Must Be Filed Within Twelve Months MPEP 214 Claim for Foreign Priority Must Be Filed Before Patent Grant MPEP 214 Petition for Unintentionally Delayed Foreign Priority in Design Applications MPEP 214.02 Permitted Claim for Priority May Be Made in Continuing Application MPEP 214 Permitted Unintentionally Delayed Foreign Priority Petition Allowed After Grant MPEP 214.02 Permitted Late Foreign Priority Claim Without Petition MPEP 214.03 Permitted Time Period for Priority Claim Not Extendable MPEP 213 Required Priority Claim for Foreign Application Not Required for Restoration Petition MPEP 213 Priority Claim Must Comply With Formal Requirements MPEP 214 Required Priority Claim Must Be Filed Before Patent Grant MPEP 214 Required Other Related FAQs 5 FAQs Collapse How do I properly identify a foreign application when claiming priority? How does the USPTO determine if a delay in claiming priority was unintentional? How does the USPTO define &#8216;unintentional delay&#8217; for priority claims? What is the deadline for filing an unintentionally delayed priority claim? Can a petition ...