In re Gamble: When a Missing PTAB Appeal Argument Costs a Patent Applicant

A patent applicant may be right about an examiner’s rejection and still lose the appeal by failing to explain why the rejection is wrong in the appeal brief. The Federal Circuit’s October 7, 2026 decision in In re Gamble illustrates the procedural cost of leaving grounds of rejection unanswered. The court affirmed a Patent Trial and Appeal Board (PTAB) decision without resolving the underlying merits of the applicant’s indefiniteness objections.

For companies and inventors evaluating a patent appeal, the point is not simply that briefs must be thorough. The brief must address each contested ground of rejection at the stage when the rules require that argument. A rehearing request or federal appeal is generally not an opportunity to supply an argument that was missing from the earlier submission.

What happened in In re Gamble?

The application at issue, U.S. Application No. 17/490,077, concerned a system for adding notes and grouping tags to email and text messages stored on a mobile device. An examiner rejected multiple claims under 35 U.S.C. § 112(b), identifying problems that included inadequate antecedent basis. The applicant amended certain claims, and the examiner withdrew the corresponding objections, but other indefiniteness rejections remained.

When the applicant appealed to the PTAB, his appeal brief did not substantively challenge the outstanding § 112(b) grounds. The Board concluded that he had forfeited those challenges and summarily sustained the examiner’s rejections. It also entered new indefiniteness rejections for other dependent claims because they inherited deficiencies from the claims on which they depended.

The applicant sought rehearing. He offered arguments concerning the original examiner rejections that had not appeared in his appeal brief, and he asserted that the Board’s newly rejected dependent claims would no longer be indefinite if the independent-claim objections were overcome. The Board denied rehearing. The Federal Circuit affirmed in In re Gamble, No. 2026-1126 (Fed. Cir. Oct. 7, 2026), a nonprecedential opinion.

The court identified forfeiture at two separate levels. In the PTAB appeal, the applicant failed to contest the examiner’s rejection in the manner required by the appeal-brief rules. In the Federal Circuit, he also failed to present a meaningful indefiniteness argument in his opening brief, attempting to present substance only in his reply. Neither omission was cured by the later filings.

The appeal brief has to contest the rejection, not merely describe the claims

The operative requirement comes from 37 C.F.R. § 41.37(c)(1)(iv). It calls for an explanation of why the examiner erred as to each ground of rejection contested, supported by the relevant authority and record. The USPTO’s Manual of Patent Examining Procedure (MPEP) § 1205.02 makes the consequence plain: if a ground of rejection is not addressed in the appeal brief, the Board may summarily sustain it unless the examiner withdraws it.

This is different from an argument that the examiner misunderstood the claim’s technical meaning. A technically strong rebuttal that never appears in the appropriate briefing can be unavailable to the appellate decision-maker. The rules do not require the Board to search prosecution history for arguments the applicant might have intended to make.

Consider an application with a section 103 obviousness rejection and an independent section 112(b) indefiniteness rejection. An appeal brief that meticulously analyzes the prior art but says nothing substantive about indefiniteness may leave the latter rejection intact. Even a successful challenge to obviousness would not, by itself, remove the separate statutory obstacle.

That practical distinction is important when deciding whether to appeal an examiner or continue patent prosecution. An appeal should be prepared around the actual grounds outstanding in the application, not just the issue that seems most significant to the applicant.

Claim grouping creates another quiet forfeiture risk

The appeal rule permits an applicant to argue claims individually, as groups, or as subgroups under a particular ground of rejection. But this flexibility has consequences. Where claims are argued together, the Board can select a representative claim and resolve the group on that basis. The USPTO explains that merely pointing out the words of a dependent claim does not establish a separate patentability argument.

Accordingly, a properly developed appeal brief must determine not only which rejections it contests but also which claims warrant separate argument. Dependent claims sometimes contain commercially valuable fallback limitations. If a business wants those limitations evaluated independently, its brief must explain the distinct patentability point under an appropriate heading and subheading.

For a technology company, that is a claim-scope decision as well as a writing decision. It requires examining the product, the specification, the claim dependencies, and the examiner’s stated rationales before deciding how to structure the appeal. Tucker Law’s PTAB and patent appeals practice addresses precisely this intersection of substantive claim strategy and procedural review.

A PTAB new ground of rejection does not reopen every old issue

Gamble also addresses a more nuanced problem. When the Board enters a new ground of rejection under 37 C.F.R. § 41.50(b), the applicant ordinarily may elect to reopen prosecution before the examiner or request rehearing before the Board on that new ground. The USPTO sets out these options in MPEP § 1214.01.

That is a meaningful opportunity, but it is not a general reset. The option exists to answer the Board’s new rejection. It does not automatically revive a challenge to an examiner’s rejection that the applicant chose not to argue in the original appeal brief.

In Gamble, the Board designated a new rejection for additional claims that inherited the same indefiniteness deficiency. The applicant’s rehearing request largely attacked the earlier examiner rejections and only asserted, in substance, that the dependent-claim problems would disappear if those earlier rejections were removed. The Federal Circuit saw no reversible error in the Board’s refusal to reconsider the newly rejected claims on that presentation.

Why rehearing is a narrow remedy

Under 37 C.F.R. § 41.52, rehearing ordinarily requires identifying with particularity what the Board misapprehended or overlooked. The rule permits some new arguments in defined circumstances, including arguments responsive to a designated new ground of rejection or based on a recent relevant decision. It does not generally allow an applicant to introduce previously omitted arguments as if the appeal were beginning again.

The procedural lesson is easy to miss. A rehearing request responding to a genuinely new PTAB ground should identify that new ground, explain the asserted error, and stay within the issues the rule allows. It should not assume that describing the effect of an omitted independent-claim argument is enough to challenge each newly rejected dependent claim.

The timing and available election also deserve independent review. The ordinary two-month period to respond to a Board-designated new ground is subject to special extension provisions, not the usual automatic extension procedure. In an appeal with mixed affirmances and new rejections, the consequences of electing rehearing rather than reopening prosecution may be substantial.

What the Federal Circuit did not decide

The opinion did not hold that the disputed mobile-messaging technology was substantively incapable of receiving a patent. Nor did it establish a new definition of indefiniteness under section 112(b). The court affirmed because the appellant had not properly preserved his substantive challenges in the PTAB and Federal Circuit briefing.

That limitation matters. In re Gamble is nonprecedential, and its procedural result should not be exaggerated into a new merits rule. It illustrates the operation of existing appeal-brief and rehearing requirements; the supporting rules and USPTO guidance are independently important to every applicant considering an appeal.

A better decision point before filing a patent appeal

Before appealing a final Office action, counsel and applicant should match each outstanding rejection to the claims it affects, identify the evidence and legal authority that will support the challenge, and decide whether particular dependent claims must be separately argued. If amendments would resolve an antecedent-basis or other drafting problem, that possibility deserves consideration before committing to appellate briefing.

An appeal brief should then make the argument it expects the PTAB to decide. The same discipline applies when reviewing a Board decision, identifying any genuinely new grounds, selecting the authorized procedural response, and considering federal judicial review. Filing additional papers cannot reliably rescue an omitted argument after the deadline for presenting it has passed.

Inventors and businesses deciding whether to challenge a patent rejection can consult Tucker Law about their patent application and enforcement strategy and the appropriate route through PTAB review and appeals. To discuss a specific patent matter, contact Tucker Law.

This article is general legal information, not legal advice. Procedural options and deadlines depend on the application’s record and applicable rules.