What is a reissue patent?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-27 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. A reissue patent is a mechanism to correct errors in an existing patent. According to 35 U.S.C. 251 , a reissue patent can be granted “ Whenever any patent is, through error, deemed wholly or partly inoperative or invalid, by reason of a defective specification or drawing, or by reason of the patentee claiming more or less than he had a right to claim in the patent “. The reissue process allows the patent owner to surrender the original patent and request a new one with corrections, provided certain conditions are met. It’s important to note that “ No new matter shall be introduced into the application for reissue “. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Reissue Patent for Inoperative or Invalid Claims MPEP 1401 Required No New Matter in Reissue Application MPEP 1401 Required No New Matter in Reissue Application MPEP 1401 Required Reissue Patent for Inoperative Error MPEP 1401 Required Reissue Claims Must Not Enlarge Original Patent Scope MPEP 1401 Reissue Patent Must Enlarge Claims Within Two Years MPEP 1401 Required Multiple Reissued Patents Allowed Upon Request MPEP 1401 Multiple Parts of Invention Can Be Reissued MPEP 1401 Required Reissue Application by Assignee Without Scope Enlargement MPEP 1401 Required No Extension of Claim Scope After Two Years MPEP 1401 Other Related FAQs 5 FAQs Collapse What are reissue applications according to MPEP 201.01? How can I request a corrected patent with a perfected foreign priority claim? How can I correct the priority claim in a patent after it has been issued? Can I add a priority claim to a patent after it has been issued? What is a reissue application and when is it used?