Continuation Claims: What the Federal Circuit Actually Permits
A continuation's claim scope may respond to later products and markets, but the original disclosure, not later commercial insight, sets the ceiling.
A case-law guide • Updated July 2026
Educational information only; not legal advice, and not a prediction for any specific patent or patent application. Application of these authorities depends on the particular record. Primarily US law and USPTO practice; other jurisdictions differ. Case law changes; confirm current treatment before relying on anything here.
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The governing idea
A continuation is a vehicle for adaptive claiming, not adaptive disclosure. An applicant may pursue claims prompted by a competitor's product, but those claims must remain supported and enabled by the disclosure that supplies their priority date.
Market-responsive continuation claiming is permissible
A continuation often is filed because the commercial importance of an invention becomes clearer after the original application. A later product or industry development may reveal which disclosed embodiment matters, whose conduct or product the claims should cover, or which claim format will be most useful. Federal Circuit law does not treat that market awareness as misconduct.
In Kingsdown Medical Consultants, Ltd. v. Hollister Inc., the court rejected the premise that it is improper to amend or insert claims intended to cover a competitor's product learned about during prosecution. The case principally concerned inequitable conduct, and the court emphasized that the claims still had to comply with the governing statutes and rules. 863 F.2d 867, 874 (Fed. Cir. 1988) (en banc in relevant part).
In State Industries, Inc. v. A.O. Smith Corp., the court applied the same principle after an applicant inspected a competitor's heater and added claims in a pending continuation-in-part that were carefully drafted to read on the competitor's product. It called that a legitimate maneuver and found support in the earlier disclosure. 751 F.2d 1226, 1235-36 (Fed. Cir. 1985).
In Liebel-Flarsheim Co. v. Medrad, Inc., the court distilled the rule: claims may be broadened during prosecution to encompass a competitor's product so long as the disclosure supports the broadened claims. 358 F.3d 898, 909 n.2 (Fed. Cir. 2004).
Together, these decisions distinguish a permissible objective from the legal requirements governing the resulting claims. Commercial targeting does not cure a defect, but it is not itself the defect. The relevant questions are whether the claims are supported and enabled, entitled to the asserted priority date, satisfy the applicable inventorship requirements, and otherwise valid. As discussed below, Apple Inc. v. International Trade Commission applies the same distinction in the prosecution-laches setting.
Continued pendency preserves literal-claiming options
Disclosure-dedication limits equivalents in the issued patent
The disclosure-dedication doctrine makes continued pendency important because it may foreclose coverage under the doctrine of equivalents without foreclosing the pursuit of literal claims in another application. In Johnson & Johnston Associates Inc. v. R.E. Service Co., the specification disclosed several substrate materials, including aluminum and steel, but the claims recited aluminum. The accused product used steel. Because the drafter disclosed but did not claim the alternative, the court held that steel could not be recaptured through the doctrine of equivalents. 285 F.3d 1046, 1054-55 (Fed. Cir. 2002) (en banc).
That holding is often stated too broadly. It does not mean that every disclosed but unclaimed embodiment is immediately and irrevocably lost. Johnson & Johnston identified two routes for pursuing literal coverage: a timely broadening reissue under 35 U.S.C. § 251 or a separate application under 35 U.S.C. § 120 filed while copendency remains. Indeed, the patentee had filed continuation applications containing claims expressly directed to steel. Any such continuation claims remain subject to written description, enablement, prior art, eligibility, obviousness-type double patenting, and the patent family's remaining term.
The practical lesson is structural. If a specification discloses commercially meaningful alternatives that the issued claims do not reach, a pending continuation can preserve the ordinary route to literal claims. Once copendency ends, that route closes, although reissue or another procedure may remain available. Meanwhile, the issued patent remains subject to the disclosure-dedication doctrine and may not reach the same alternative through the doctrine of equivalents.
The original disclosure remains the ceiling
A continuation may recast the disclosed invention in new claims, but it cannot enlarge the invention disclosed at the filing date. It receives the benefit of an earlier filing date only for subject matter that the earlier application adequately describes and enables. Later claims may reorganize, generalize, or focus the disclosed subject matter, but they may not use hindsight to supply an invention the original application did not teach.
Written description: possession, not word matching
Written description requires the original application to reasonably convey that the inventors possessed the later-claimed subject matter as of the filing date. In ICU Medical, Inc. v. Alaris Medical Systems, Inc., years after filing, the applicant pursued claims broad enough to cover a valve without a spike. The specification described only valves with spikes and did not reasonably convey possession of a spikeless valve. The fact that a skilled artisan might have found the variation obvious could not substitute for description of the claimed invention. 558 F.3d 1368, 1376-79 (Fed. Cir. 2009).
In Gentry Gallery, Inc. v. Berkline Corp., the court applied the same possession requirement to a specification that identified the console as the location for the recliner controls and treated that location as an essential aspect of the invention. Claims omitting the location limitation therefore lacked written-description support. 134 F.3d 1473, 1479-80 (Fed. Cir. 1998).
These decisions do not create a categorical rule that a claim must contain every feature appearing in every embodiment, or that one disclosed embodiment fixes the maximum claim scope. Gentry was driven by how the specification characterized the control location; ICU Medical by a disclosure that repeatedly and exclusively described the allegedly omitted structure. The statutory question remains whether the application, read as a whole through the eyes of a skilled artisan, reasonably conveys that the inventors possessed the later-claimed subject matter.
Nor is support a vocabulary exercise. MPEP 2163 directs that the disclosure be evaluated as a whole, including drawings and disclosed relationships. A claim can be supported without copying the specification's words. Conversely, every claim term can appear somewhere in the application while the claimed combination does not. Drawings, disclosed relationships, alternatives, and the way embodiments are presented together or separately all matter.
Enablement: the disclosure must teach the claim's full scope
Enablement independently requires the original disclosure to teach a skilled artisan how to make and use the full scope of the later claim without undue experimentation. In Liebel-Flarsheim Co. v. Medrad, Inc., after obtaining a construction broad enough to cover injectors both with and without a pressure jacket, the patentee faced enablement across that full scope. The specification focused on jacketed systems, taught away from a jacketless approach, and the evidence supported the conclusion that a workable jacketless system would have required undue experimentation at the filing date. The claims were invalid for lack of enablement. 481 F.3d 1371, 1378-80 (Fed. Cir. 2007).
The litigation advantage of a broad construction can therefore become the validity problem. Written description asks whether the inventors possessed what is claimed; enablement asks whether the disclosure teaches skilled artisans to make and use the full scope without undue experimentation. A continuation must satisfy both.
Functional claiming remains subject to § 112(f)
Functional language may broaden a continuation claim's apparent reach, but it remains subject to 35 U.S.C. § 112(f) when the claim term fails to identify sufficient structure for performing the stated function. In Williamson v. Citrix Online, LLC, the court rejected the heightened presumption against means-plus-function treatment when a claim omits the word "means." Because "distributed learning control module" did not recite sufficiently definite structure for performing the claimed function, the court applied § 112(f) and found the claim indefinite for lack of adequate corresponding structure in the specification. 792 F.3d 1339, 1348-54 (Fed. Cir. 2015) (en banc in relevant part).
Williamson is not specifically a continuation doctrine, but it presents a recurring continuation risk. Functional language chosen to reach a new implementation may be limited under § 112(f) to the disclosed corresponding structure and its equivalents, or may be indefinite if the specification supplies no adequate corresponding structure. See also MPEP 2181 for USPTO treatment of means-plus-function limitations.
The prosecution record can travel across the family
A continuation has a new claim set, not an isolated history. Statements made to obtain allowance can affect construction of related patents when the patents share relevant language and the statements amount to a clear disclaimer.
In Hakim v. Cannon Avent Group, PLC, the applicant narrowed claim scope in a parent to overcome prior art, then pursued broader language in a continuation. The earlier disclaimer continued to govern because the continuation record did not clearly inform the examiner that the prior disclaimer, and the prior art it addressed, needed to be revisited. Hakim recognizes that a disclaimer may be rescinded, but the record must make the change sufficiently clear. 479 F.3d 1313, 1317-18 (Fed. Cir. 2007).
In Barrette Outdoor Living, Inc. v. Fortress Iron, LP, the court applied that family-history principle to statements made while prosecuting a later family member, holding that they narrowed a common claim term in patents that had already issued. Relying on Teva Pharmaceuticals USA, Inc. v. Sandoz, Inc., 789 F.3d 1335, 1343 (Fed. Cir. 2015), the court explained that a relevant family prosecution statement may inform claim construction whether it predates or postdates issuance of the patent being construed. 156 F.4th 1353 (Fed. Cir. 2025).
The combined lesson is narrower than saying that every statement automatically binds every relative. The analysis turns on the relationship among the patents, the shared terminology, and the clarity and relevance of the statement. But a characterization made for one family member should be drafted with the entire family in view.
Application type determines which protections and restrictions apply
The procedural vehicle used to pursue later claims can determine which protections and restrictions apply, even when related applications share substantially the same disclosure. A continuation, continuation-in-part, divisional, and reissue may occupy related positions in a patent family, but they are not interchangeable. Section 121 and the recapture rule illustrate why actual lineage and prosecution history matter.
The § 121 safe harbor is not a generic continuation benefit
Section 121 protects certain divisional applications filed as a result of a restriction requirement, not every continuing application that descends from a restricted application. In Pfizer, Inc. v. Teva Pharmaceuticals USA, Inc., the court held that the safe harbor of 35 U.S.C. § 121 did not protect a continuation-in-part. Its reasoning emphasized both the statutory text directed to divisional applications and the possibility that a continuation-in-part contains matter outside the restricted disclosure. 518 F.3d 1353, 1361-62 (Fed. Cir. 2008).
An application's original filing posture cannot ordinarily be rewritten after the fact to obtain the safe harbor. In G.D. Searle LLC v. Lupin Pharmaceuticals, Inc., the court likewise refused to apply the safe harbor after a reissue deleted new matter and redesignated the original continuation-in-part as a divisional. The application's actual lineage and prosecution history, not a later label, controlled. 790 F.3d 1349, 1354-55 (Fed. Cir. 2015).
Even a true divisional must be filed as a result of the restriction and maintain consonance with the restricted invention groups. Section 121 protection is therefore a filing-history issue that should be considered before the application type and claim architecture are fixed.
Recapture belongs to reissue practice
The recapture rule applies specifically to reissue applications and does not generally prevent an applicant from pursuing broader claims in a continuation filed while copendency remains. In In re Clement, the court explained that the recapture rule prevents a patentee from using a broadening reissue to regain subject matter surrendered during the original prosecution. A continuation filed while copendency exists does not itself invoke the reissue recapture rule. 131 F.3d 1464, 1468-70 (Fed. Cir. 1997). See MPEP 1412.02 for the USPTO's recapture-rule discussion.
Continuation prosecution may nevertheless affect a later recapture analysis. In In re McDonald, the court held that, in a later reissue, the surrender inquiry may draw on prosecution history across the patent family. Thus, filing a continuation does not trigger the recapture rule, although statements and amendments made during continuation prosecution may contribute to the surrender record examined in a later reissue. 43 F.4th 1340, 1347-49 (Fed. Cir. 2022).
Separate doctrines remain in play. Hakim addresses claim-construction disclaimer in a continuation. Prosecution-history estoppel may also restrict equivalents after a narrowing amendment made to satisfy a requirement of the Patent Act. Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co., 535 U.S. 722, 736-37 (2002).
Long pendency is not enough, but delay can become laches
Prosecution laches depends on the applicant's conduct and the resulting prejudice, not simply on the age or number of applications in a continuation chain.
Under Hyatt v. Hirshfeld, prosecution laches requires unreasonable and inexcusable delay under the totality of the circumstances and prejudice attributable to that delay. The prosecution history of an entire related family may be relevant. 998 F.3d 1347, 1362-67 (Fed. Cir. 2021).
In Personalized Media Communications, LLC v. Apple Inc., the court applied that standard to an exceptional record involving a deliberate strategy of enormous claim proliferation and delayed issuance, coupled with intervening investment in the claimed technology, and affirmed unenforceability. The decision illustrates the doctrine's focus on conduct and prejudice, not a numerical limit on continuation length. 57 F.4th 1346, 1354-60 (Fed. Cir. 2023).
In Google LLC v. Sonos, Inc., the court reached the opposite result because Google failed to prove prejudice. It expressly limited its analysis to that element and did not decide whether Sonos's delay was unreasonable or inexcusable. The published specification disclosed the relevant functionality before Google's alleged investment, and unsupported assertions of earlier investment could not carry Google's burden. No. 2024-1097, slip op. at 15-17 (Fed. Cir. Aug. 28, 2025) (nonprecedential).
In Hyatt v. Stewart, the court affirmed the district court's application of prosecution laches after remand on an unusually prolonged prosecution record. The decision confirms that the doctrine remains available for an extreme, evidence-supported case even though ordinary continuation practice is lawful. 148 F.4th 1376 (Fed. Cir. 2025).
In Apple Inc. v. International Trade Commission, the court likewise affirmed a no-laches determination where prosecution remained continuous, legitimate grounds existed for refiling, and the record contained no evidence of purposeful delay to draft claims against Apple's products. The decision is the most recent precedential counterweight to the exceptional facts in PMC and Hyatt. No. 2024-1285, slip op. at 34-36 (Fed. Cir. Mar. 19, 2026).
Taken together, the cases establish no safe or prohibited number of years, applications, or generations. The inquiry is record-specific and considers the reasons for delay, the applicant's conduct, and whether others invested in, worked on, or used the claimed technology during the relevant period. Continuous prosecution and legitimate reasons for refiling weigh against laches, but the totality of the circumstances controls.
After an IPR, unadjudicated claims are not automatically precluded
An adverse inter partes review (IPR) decision does not automatically preclude litigation of related claims that the Patent Trial and Appeal Board never adjudicated, although those claims remain subject to invalidity challenges on the merits. In Kroy IP Holdings, LLC v. Groupon, Inc., the court held that an IPR judgment finding some claims unpatentable did not collaterally estop the patent owner from asserting different claims that the Board had not adjudicated, even assuming the newly asserted claims were immaterially different for invalidity. The reason was procedural: the Board applies a preponderance standard, while invalidity in district court must be proved by clear and convincing evidence. 127 F.4th 1376, 1380-83 (Fed. Cir. 2025).
Kroy should not be converted into a claim-drafting rule. It does not hold that small wording changes create independent substantive value, and it does not insulate the new claims from the same prior art. It holds that the lower-burden IPR determination does not itself preclude litigation of unadjudicated claims under the higher district-court burden. A finally cancelled claim, by contrast, no longer exists and cannot be asserted. The court denied panel and en banc rehearing on August 1, 2025. Chief Judge Moore concurred, emphasizing the different burdens of proof, while Judge Dyk dissented on the ground that the panel's rule permits assertion of patentably indistinct claims following an adverse IPR.
In mCom IP, LLC v. City National Bank of Florida, the district court independently held that the claims not challenged in the IPR were obvious on the same grounds applied to the claims found unpatentable by the Board. On appeal, mCom challenged the dismissal only as to claim 17 and failed to show error in the district court's invalidity ruling. The Federal Circuit therefore affirmed without holding that the IPR decision itself had preclusive effect. The case illustrates Kroy's limit: the absence of automatic collateral estoppel does not prevent the same prior art from establishing invalidity on the merits. No. 2024-2089 (Fed. Cir. May 15, 2026).
In Ohio Willow Wood Co. v. Alps South, LLC, the court addressed the contrasting district-court-to-district-court setting, where a prior invalidity judgment can preclude later assertion of unadjudicated claims if their differences do not materially alter the invalidity issue. That setting does not present the burden-of-proof mismatch that controlled Kroy. 735 F.3d 1333, 1342-43 (Fed. Cir. 2013).
Practical implications for continuation strategy
- Market awareness is permissible. Claims may be drafted with a competitor's product in mind; improper intent is not inferred from that objective alone.
- The filing-date disclosure is the ceiling. A continuation cannot manufacture written-description support or enablement through later knowledge.
- Claim breadth has multiple costs. Omitting a feature may create written-description or enablement exposure, and functional language may invoke § 112(f).
- The family record is shared more than it appears. Parent disclaimers may follow a continuation, and later family statements may inform construction of earlier-issued patents.
- Lineage matters. Continuation, continuation-in-part, divisional, and reissue are not interchangeable labels, especially under § 121 and recapture.
- Pendency alone is not laches. The doctrine remains exceptional and requires both unreasonable, inexcusable delay and attributable prejudice.
- An IPR result has precise procedural effects. Kroy bars automatic collateral estoppel of unadjudicated claims based on a lower-burden IPR ruling; mCom illustrates that those claims still may fail on the merits.
Bottom line
The Federal Circuit's continuation cases are best understood as a coherent allocation of risk. The patent system allows applicants to keep disclosed subject matter available for later claiming and to react to commercial developments. In return, it holds them to the original disclosure, the full scope of the claims, the family's prosecution record, the statutory consequences of application type, and equitable limits on genuinely abusive delay. A continuation is powerful because it preserves claim choice, not because it rewrites what was invented at filing.
Frequently Asked Questions
Can continuation claims be written to cover a competitor's product?
Yes. In Kingsdown Medical Consultants v. Hollister, 863 F.2d 867, 874 (Fed. Cir. 1988), the court rejected the premise that it is improper to amend or insert claims intended to cover a competitor's product learned about during prosecution. State Industries v. A.O. Smith called that a legitimate maneuver, and Liebel-Flarsheim v. Medrad, 358 F.3d 898, 909 n.2 (Fed. Cir. 2004), distilled the rule: claims may be broadened during prosecution to encompass a competitor's product so long as the disclosure supports the broadened claims. Commercial targeting does not cure a defect, but it is not itself the defect.
Does a disclaimer made in the parent application affect continuation claims?
It can. In Hakim v. Cannon Avent Group, 479 F.3d 1313, 1317-18 (Fed. Cir. 2007), an applicant narrowed scope in a parent to overcome prior art, then pursued broader language in a continuation. The earlier disclaimer continued to govern because the continuation record did not clearly inform the examiner that the prior disclaimer, and the prior art it addressed, needed to be revisited. A disclaimer may be rescinded, but the record must make the change sufficiently clear. The analysis turns on the relationship among the patents, the shared terminology, and the clarity and relevance of the statement, rather than on an automatic rule.
Can a continuation claim drop a limitation that appears in the parent's claims?
Sometimes, and the answer turns on the disclosure rather than on a categorical rule. In ICU Medical v. Alaris, 558 F.3d 1368, 1376-79 (Fed. Cir. 2009), claims broad enough to cover a valve without a spike failed because the specification described only valves with spikes, and the fact that a skilled artisan might have found the variation obvious could not substitute for description of the claimed invention. Gentry Gallery v. Berkline, 134 F.3d 1473, 1479-80 (Fed. Cir. 1998), reached a similar result where the specification treated the control location as an essential aspect of the invention. Neither decision creates a rule that a claim must contain every feature appearing in every embodiment, or that one disclosed embodiment fixes the maximum claim scope. The question remains whether the application, read as a whole through the eyes of a skilled artisan, reasonably conveys that the inventors possessed the later-claimed subject matter.
Does the section 121 safe harbor protect a continuation?
The Federal Circuit has limited the safe harbor to divisional applications filed as a result of a restriction requirement. Pfizer v. Teva, 518 F.3d 1353, 1361-62 (Fed. Cir. 2008), denied it to a continuation-in-part, and G.D. Searle v. Lupin, 790 F.3d 1349, 1354-55 (Fed. Cir. 2015), refused to apply it after a reissue deleted new matter and redesignated the original continuation-in-part as a divisional. Actual lineage and prosecution history control, not a later label. Even a true divisional must be filed as a result of the restriction and maintain consonance with the restricted invention groups.
If an IPR invalidates some claims, can related claims still be asserted?
An adverse IPR does not automatically preclude claims the Board never adjudicated. Kroy IP Holdings v. Groupon, 127 F.4th 1376, 1380-83 (Fed. Cir. 2025), so held, because the Board applies a preponderance standard while invalidity in district court must be proved by clear and convincing evidence. Rehearing and rehearing en banc were denied on August 1, 2025. Kroy should not be converted into a claim-drafting rule: it does not hold that small wording changes create independent substantive value, and it does not insulate the new claims from the same prior art. In mCom IP v. City National Bank of Florida, No. 2024-2089 (Fed. Cir. May 15, 2026), claims not challenged in the IPR were still held obvious on the same grounds. A finally cancelled claim no longer exists and cannot be asserted, and the burden mismatch that controlled Kroy is absent in the district-court-to-district-court setting addressed in Ohio Willow Wood v. Alps South, 735 F.3d 1333, 1342-43 (Fed. Cir. 2013).
Is disclosed but unclaimed subject matter really lost to the public?
Not entirely, and the doctrine is often stated too broadly. Johnson & Johnston v. R.E. Service, 285 F.3d 1046, 1054-55 (Fed. Cir. 2002) (en banc), forecloses recapturing a disclosed but unclaimed alternative through the doctrine of equivalents. The decision identified two routes for pursuing literal coverage: a timely broadening reissue under 35 U.S.C. 251, or a separate application under 35 U.S.C. 120 filed while copendency remains. Any such claims remain subject to written description, enablement, prior art, eligibility, obviousness-type double patenting, and the family's remaining term. Once copendency ends that ordinary route closes, although reissue or another procedure may remain available.
Does a long chain of continuations create prosecution laches risk?
Not on length alone. Hyatt v. Hirshfeld, 998 F.3d 1347, 1362-67 (Fed. Cir. 2021), requires unreasonable and inexcusable delay under the totality of the circumstances and prejudice attributable to that delay. Personalized Media Communications v. Apple, 57 F.4th 1346, 1354-60 (Fed. Cir. 2023), affirmed unenforceability on an exceptional record of claim proliferation and delayed issuance coupled with intervening investment. In Google v. Sonos, No. 2024-1097 (Fed. Cir. Aug. 28, 2025) (nonprecedential), the court reached the opposite result because Google failed to prove prejudice; it expressly limited its analysis to that element and did not decide whether Sonos's delay was unreasonable or inexcusable. Hyatt v. Stewart, 148 F.4th 1376 (Fed. Cir. 2025), affirmed laches on an unusually prolonged record, and Apple v. International Trade Commission, No. 2024-1285 (Fed. Cir. Mar. 19, 2026), affirmed no laches where prosecution remained continuous and no purposeful delay appeared. The cases establish no safe or prohibited number of years, applications, or generations.
Can arguments made in a continuation narrow a patent that already issued?
Yes. In Barrette Outdoor Living v. Fortress Iron, 156 F.4th 1353 (Fed. Cir. 2025), statements made while prosecuting a later family member narrowed a common claim term in patents that had already issued. The court relied on Teva Pharmaceuticals USA v. Sandoz, 789 F.3d 1335, 1343 (Fed. Cir. 2015), under which a relevant family prosecution statement may inform claim construction whether it predates or postdates issuance of the patent being construed. This is narrower than saying that every statement automatically binds every relative. The analysis turns on the relationship among the patents, the shared terminology, and the clarity and relevance of the statement.
Does the recapture rule apply to continuation claims?
Recapture is a reissue doctrine. In re Clement, 131 F.3d 1464, 1468-70 (Fed. Cir. 1997), explains that it prevents a patentee from using a broadening reissue to regain subject matter surrendered during the original prosecution, and a continuation filed while copendency exists does not itself invoke it. See MPEP 1412.02. Continuation prosecution can still matter later: In re McDonald, 43 F.4th 1340, 1347-49 (Fed. Cir. 2022), held that in a later reissue the surrender inquiry may draw on prosecution history across the patent family. Prosecution-history estoppel under Festo, 535 U.S. 722, 736-37 (2002), and the separate Hakim disclaimer analysis remain in play.