Can I perfect a claim for foreign priority after my patent has been issued?

Yes, you can perfect a claim for foreign priority after your patent has been issued. There are two main methods:

1. Certificate of Correction: This is generally the preferred method if the requirements of 37 CFR 1.55 are met and no further examination is required. As stated in the MPEP, Except in certain situations, a certificate of correction can generally be used to perfect a claim to foreign priority where a petition under 37 CFR 1.55(e) to accept an unintentionally delayed priority claim is filed with a request for a certificate of correction in an issued patent.
2. Reissue Application: This method is necessary in situations where further examination would be required or when the requirements of 35 U.S.C. 119(a)-(d) or (f) were not satisfied in the patented application or its parent prior to issuance.

To learn more:

• foreign priority
• patent correction
• certificate of correction
• reissue application