Broadening Reissue

A broadening reissue is a reissue application under 35 U.S.C. § 251 in which the patentee seeks claims that are broader in scope than the original patent's claims — for example, removing a limitation from an independent claim, broadening the claim from a specific embodiment to a genus, or adding new independent claims with fewer limitations. Reissue (§ 251) allows a patentee to correct 'error' in an issued patent — including errors of claiming too narrowly. The statutory basis: a patent may be reissued 'to correct error arising without deceptive intention…' on oath by the applicant. The broadening reissue process involves filing a new application that surrenders the original patent, prosecuting the reissue claims at the USPTO, and receiving a reissue patent (designated Re) that replaces the original. CONSTRAINTS: (1) BROADENING WINDOW — a broadening reissue (one that seeks broader claims) must be filed within 2 years of the original patent's issue date; after 2 years, only narrowing reissues are permissible; (2) RECAPTURE RULE — the broadened claims cannot reclaim scope surrendered during the original prosecution to overcome a rejection; (3) INTERVENING RIGHTS — third parties who began practicing the original patent's scope (or who made substantial preparations) have statutory and equitable intervening rights.

The two-year broadening window (35 U.S.C. § 251, second paragraph): '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.' KEY POINTS: (1) THE CLOCK RUNS FROM ISSUE DATE — not from grant of the reissue application, not from filing the reissue application, not from the priority filing date; the 2 years runs from when the original patent issued (was granted); (2) FILING WITHIN 2 YEARS IS SUFFICIENT — the reissue application must be FILED within 2 years; it need not be granted within 2 years; prosecution of the reissue can continue beyond the 2-year mark; (3) BROADENING vs. NARROWING — after 2 years, narrowing reissues (correcting description, removing incorrect claims, correcting inventorship) remain available without time limit; the 2-year bar applies only to enlarging claim scope; (4) WHAT IS 'BROADENING': a reissue claim is broader than the original if it covers any product or process that the original claims did not cover; it is broader even if it is also narrower in some respects (Tillotson, Ltd. v. Walbro Corp., Fed. Cir. 1989). PRACTICAL IMPLICATION: patent owners should review issued patents promptly after issuance and, if broader claims may be warranted, file the broadening reissue application within the 2-year window.

The recapture rule prevents a patentee from using reissue to reclaim scope that was intentionally surrendered during original prosecution to overcome a rejection. RULE: if a claim limitation was added or narrowed to overcome a prior art rejection, the patentee cannot obtain a reissue claim that removes or broadens that limitation to recapture the surrendered scope. BASIS: the recapture rule is the reissue analog to prosecution history estoppel in the doctrine of equivalents context — in both cases, the patentee is held to the scope they represented to the USPTO. RECAPTURE vs. COMPLETE SURRENDER: the Federal Circuit applies a three-step recapture analysis: (1) Is the reissue claim broader than the original claim in a relevant limitation? (2) Did the original prosecution involve a surrender of subject matter related to the broader limitation? (3) Does the reissue claim attempt to recapture surrendered subject matter? Partial surrenders can be recaptured in part — the recapture rule does not necessarily bar ALL broadening of a claim, only broadening that seeks to recapture the specific surrendered scope. IN RE CLEMENT (Fed. Cir. 1998): articulated the modern three-step recapture analysis. EFFECT: the recapture rule means that 'error' under § 251 cannot include a patentee deciding that a deliberate narrowing amendment was a bad strategic choice — recapture bars only the scope intentionally surrendered, not other broadening.

Intervening rights protect third parties who, in good faith, began practicing the claimed invention after the original patent issued but before the broadening reissue was granted — relying on the absence of the broader claim scope in the original patent. TWO TYPES under 35 U.S.C. § 252: (1) STATUTORY INTERVENING RIGHTS — a person is absolutely entitled to continue using or selling a specific article or apparatus already made before the reissue grant; these rights are absolute and cannot be denied by the court; (2) EQUITABLE INTERVENING RIGHTS — a court may, in its equitable discretion, allow a person who 'made substantial preparation' (purchased plant and equipment, entered into binding contracts) to continue practicing the reissue claims even for articles made AFTER the reissue grant; these are equitable and discretionary, not absolute. KEY ELEMENTS: the third party must have made the product or made substantial preparations BEFORE the reissue grant; good faith reliance on the original, narrower patent scope; the broader reissue claim covers what the original did not. POLICY: intervening rights balance the patentee's right to correct an error against the reasonable expectations of third parties who made investments based on the limited scope of the original claims. SEMICONDUCTOR ENERGY LABORATORY: intervening rights extend only to specific acts already performed, not ongoing operations unless equitable rights are established.

Three mechanisms can affect issued patent claim scope: BROADENING REISSUE (§ 251): filed by the patentee; corrects 'error' in the issued patent; can broaden (within 2 years) or narrow claims; subject to recapture rule; intervening rights apply; the original patent is surrendered and a reissue patent issues; changes take effect from original patent grant date (with intervening rights protection); cost: ~$1,700–2,500 USPTO fees + attorney time; prosecution timeline: typically 2–4 years. CONTINUATION APPLICATION (§ 120): filed while original application is pending (must be copending); does NOT surrender the original patent — both can survive (original + continuation); no time limit tied to original issue date; no recapture rule (free to claim broader scope if fully supported); no intervening rights concerns for future infringement; most flexible mechanism to expand claim coverage over time. EX PARTE REEXAMINATION (§§ 302–307): initiated based on prior art patents or printed publications; cannot broaden claims (reexamination can only cancel or narrow claims, add dependent claims, or correct claims to be patentable); used to strengthen a patent against challenge or to modify claims to improve enforceability. SUMMARY: to broaden claims post-issuance, broadening reissue is the primary mechanism — continuations should have been pursued before the original issued (copendency requirement); after the 2-year window closes, broadening via reissue is no longer available.