12.1 Reissue Applications & Certificates of Correction

Reissue Applications & Certificates of Correction

Once a patent issues, the patent owner or the United States Patent and Trademark Office (USPTO) may discover defects, typographical errors, ambiguous claim terms, or errors in inventorship. Federal patent law provides specific statutory mechanisms to correct issued patents. The appropriate procedural mechanism depends strictly on the nature of the error, whether fixing the error alters the substantive scope of the claims, and the amount of time that has elapsed since patent grant.

---

Certificates of Correction (35 U.S.C. §§ 254–256)

Certificates of Correction are designed for minor, non-substantive mistakes. They do not involve reexamination of the patent claims by an examiner, nor do they permit substantive expansion or restructuring of the patent disclosure.

USPTO Mistakes (35 U.S.C. § 254 & MPEP 1480)

When a mistake in a patent is incurred through the fault of the USPTO (e.g., printing errors, omitted text present in allowed claims, or typographical mistakes made by the printer), the Director may issue a Certificate of Correction without fee. The corrected patent has the same effect and operation in law as if the patent had been originally issued in such corrected form.

Applicant Mistakes (35 U.S.C. § 255 & MPEP 1481)

When an error of a clerical, typographical, or minor nature occurs through the fault of the applicant, a Certificate of Correction may be issued upon payment of the required fee under 37 C.F.R. § 1.20(a), provided:

1. The mistake is clerical, typographical, or minor in character and occurred in good faith;
2. The correction does not constitute a change in the patent that would require reexamination; and
3. The correction does not alter the scope of any claim in the patent.

If a proposed correction affects claim scope or requires reexamination (e.g., attempting to insert omitted disclosure or narrow a claim term), a Certificate of Correction is strictly prohibited, and the patentee must instead file a reissue application.

Correction of Inventorship (35 U.S.C. § 256 & MPEP 1481.02)

Whenever through error an inventor is named in an issued patent who should not have been named, or an inventor is omitted who should have been named, the Director may issue a certificate correcting such error, and the AIA removed the former “without deceptive intention” condition. Current correction practice requires the prescribed request, fee, and supporting information; consent of every affected person is not a universal statutory prerequisite.

---

Reissue Applications (35 U.S.C. § 251 & MPEP 1401–1460)

When an issued patent is deemed wholly or partly inoperative or invalid due to a defective specification, drawing, or because the patentee claimed more or less than they had a right to claim, 35 U.S.C. § 251 permits the patentee to surrender the original patent and file a Reissue Application.

+-----------------------------------------------------------------------------------+
|                         STATUTORY REQUIREMENTS FOR REISSUE                        |
+-----------------------------------------------------------------------------------+
| 1. At least one correctable error makes the patent wholly or partly inoperative/invalid. |
| 2. Patent is wholly or partly inoperative or invalid (e.g., claims too broad/narrow).|
| 3. Reissue is for the "same invention" originally disclosed in the specification. |
| 4. Surrender of original patent becomes effective immediately upon reissue grant.  |
+-----------------------------------------------------------------------------------+

Oath and Declaration Requirements (MPEP 1414)

To support a reissue application, the applicant must file an oath or declaration specifying at least one error in the original patent that renders the patent inoperative or invalid. For a reissue filed on or after September 16, 2012, the oath or declaration identifies at least one qualifying error; the former “without deceptive intent” statement is not required.

Narrowing vs. Broadening Reissue (MPEP 1412.03)

• Narrowing Reissue: A reissue application that seeks only to limit or narrow claim scope (e.g., adding limitations to overcome prior art) may be filed at any time during the unexpired term of the patent.
• Broadening Reissue: If a reissue application seeks to enlarge the scope of any claim in any respect, it is classified as a broadening reissue. Under 35 U.S.C. § 251(c), no reissued patent shall be granted enlarging the scope of the claims of the original patent unless applied for within two years from the grant of the original patent.

Strict 2-Year Deadline: The 2-year statutory limit applies to the filing date of the broadening reissue application. If a narrowing reissue application is filed within two years, the applicant cannot later amend the claims to broaden them after the two-year period has expired, unless a broadening intent was explicitly expressed in a broadening reissue application filed within the two years.

The Recapture Doctrine (MPEP 1412.02)

The Recapture Doctrine prevents a patentee from using a reissue application to reclaim (recapture) subject matter that was surrendered during original prosecution to overcome a prior art rejection under § 102 or § 103. If an applicant narrowingly amended a claim or canceled a claim to secure allowance during original examination, attempting to re-obtain that surrendered subject matter via reissue is legally improper.

---

Intervening Rights (35 U.S.C. § 252 & MPEP 1449)

Because a reissue patent may alter claim scope or introduce new claims, 35 U.S.C. § 252 protects third parties who commenced manufacturing or using the patented invention prior to the reissue grant through two distinct forms of Intervening Rights:

1. Absolute Intervening Rights (§ 252, first paragraph): Protects specific physical items or products that were made, purchased, or used prior to the grant of the reissue patent. A third party has the absolute right to offer for sale, sell, or use those specific, existing physical items without liability, provided those items do not infringe a claim in the reissue patent that was carried over unchanged from the original patent.
2. Equitable Intervening Rights (§ 252, second paragraph): Grants district courts discretionary authority to permit a third party to continue manufacturing, purchasing, or using additional items after the reissue grant. Courts may grant equitable intervening rights if the third party made substantial preparations or investments prior to the reissue grant date.

---

Summary Comparison: Correction Mechanisms