Can a Certificate of Correction be used to extend the scope of a patent claim?

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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. No, a Certificate of Correction cannot be used to extend the scope of a patent claim. The purpose of a Certificate of Correction is to correct minor errors or mistakes, not to substantively change the patent’s scope or add new matter. According to MPEP 1481 : “A mistake in a patent may be corrected by certificate of correction only if the mistake is of a clerical or typographical nature, or of minor character, and was not the fault of the Office.” Extending the scope of a claim would be considered a substantial change and is not permitted through a Certificate of Correction. Such changes might be possible through other processes, such as reissue, but these involve more extensive procedures and requirements. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Certificate of Correction Mistakes Must Be Minor MPEP 1481 Required Requirements for Certificate of Correction of Applicant’s Mistake MPEP 1481 Required Criteria for Certificate of Correction Under 35 U.S.C. 255 MPEP 1481 Patentee Can Request Certificate of Correction MPEP 1481 Permitted Mistakes Broadening Claims Cannot Be Minor MPEP 1481 Prohibited Mistake Affecting Claim Scope Must Be Corrected by Reissue MPEP 1481 Required Correction Must Not Add New Matter or Require Reexamination MPEP 1481 Prohibited Mistake of Minor Character Excludes Claim Broadening MPEP 1481 Correction Must Not Add New Matter or Require Reexamination MPEP 1481 Claims Cannot Be Broadered via Correction MPEP 1481 Other Related FAQs 5 FAQs Collapse What happens if a new inventor is identified in a CPA without filing a proper request? Can an inventor&#8217;s oath or declaration be corrected or withdrawn after submission? What should I do i...