On October 17, 2025, the Federal Circuit issued a detailed and consequential opinion in Barrette Outdoor Living, Inc. v. Fortress Iron, LP, affirming a judgment of non-infringement while also affirming the district court’s rejection of indefiniteness challenges. The case provides a clear reminder that arguments made during prosecution of a later-filed continuation application can narrow the scope of earlier-issued patents in the same family, even where those earlier patents were already granted and never amended.
The decision is especially notable for its careful treatment of prosecution disclaimer across time, its distinction between examiner disagreement and applicant acquiescence, and its application of those principles to claim terms that appear, at least facially, to be broader than the disclaimed language. As Charles Gideon Korrell has observed in other contexts, this opinion underscores that prosecution arguments can be as dangerous as claim amendments, particularly in large patent families with overlapping claim language.
Background and the Asserted Patents
Barrette owns four related patents directed to fencing and railing assemblies that use sliding, pivoting connectors to attach pickets to rails. The patents share a common specification and trace back to a common parent application. The asserted patents include U.S. Patent Nos. 8,413,332; 8,413,965; 9,551,164; and 9,963,905. The claims generally recite connectors having “bosses,” “projections,” or similar protruding structures that engage holes in the pickets, allowing the pickets to pivot and slide relative to the rails.
The accused products, Fortress’s Athens Residential fences, use connectors that employ non-integral fasteners. After claim construction, Barrette stipulated that it could not prove infringement under the district court’s construction, while Fortress stipulated that it could not prove indefiniteness. That procedural posture set the stage for a clean appeal on claim construction and indefiniteness.
Claim Construction and the “Boss” Terms
The central dispute on appeal concerned the meaning of “boss,” “projection,” and related terms. The district court construed these terms as limited to integral structures, and further concluded that they were fastener-less. Barrette challenged both aspects of that construction.
The Federal Circuit agreed with Barrette on one point but not the other. First, the court rejected the district court’s conclusion that the specification clearly and unmistakably disclaimed bosses that use fasteners. Relying on Phillips v. AWH Corp., the court reiterated that patents often describe multiple advantages over the prior art and that claims should not automatically be limited to structures that achieve every disclosed advantage. Here, although the specification emphasized fast installation as one benefit of the invention, it also emphasized improved racking ability, which did not inherently require fastener-less connections. The intrinsic record did not support importing a fastener-less limitation into the claims.
That conclusion, however, did not save Barrette’s infringement case.
Prosecution Disclaimer and Integral Structures
The decisive issue was prosecution disclaimer arising from statements made during prosecution of a later continuation application that issued as the ’075 patent. During that prosecution, the examiner rejected claims over the Sherstad reference, which disclosed a pivot pin assembly. In response, Barrette argued that Sherstad failed to disclose a “slip-together connection with the claimed integral boss,” distinguishing Sherstad’s use of a discrete pin member from Barrette’s claimed structure.
The Federal Circuit held that this argument constituted a clear and unmistakable disclaimer of non-integral bosses. Importantly, the court rejected Barrette’s attempt to characterize the argument as ambiguous or ineffective simply because the examiner ultimately maintained the rejection and Barrette later canceled the claims. The focus of disclaimer analysis, the court emphasized, is what the applicant said, not whether the argument persuaded the examiner or was strictly necessary to secure allowance.
The court distinguished Ecolab, Inc. v. FMC Corp. and Malvern Panalytical Inc. v. TA Instruments-Waters LLC, where examiner disagreement and applicant acquiescence rendered earlier narrowing arguments ambiguous. Here, the examiner did not disagree with Barrette’s characterization of its own claims. Rather, the examiner disagreed with Barrette’s characterization of the prior art. Nothing in the prosecution history suggested that Barrette’s description of its own invention was mistaken or withdrawn.
As Charles Gideon Korrell notes, this distinction is critical. Examiner disagreement with claim scope may neutralize a disclaimer, but examiner disagreement with an applicant’s reading of the prior art does not.
Temporal Reach of Disclaimer Across the Family
Barrette also argued that statements made during prosecution of the later-filed ’075 patent could not limit the scope of earlier-issued patents such as the ’332 and ’965 patents. The Federal Circuit squarely rejected that argument, citing Teva Pharmaceuticals USA, Inc. v. Sandoz, Inc. for the proposition that statements made during prosecution of related patents may be considered in construing common claim terms, regardless of whether the statements pre- or post-date issuance of the patent at issue.
This aspect of the opinion reinforces a recurring theme in Federal Circuit jurisprudence: patent families rise and fall together when claim language and specifications are shared. Strategic arguments in one application can echo backward in time.
Extending the Disclaimer to Related Terms
Barrette attempted to limit the damage by arguing that even if “boss” was limited to integral structures, other claim terms—such as “projection,” “nub,” and “series of axles”—should retain broader meanings. The court was unpersuaded.
As to “projection,” the court found forfeiture. Barrette had repeatedly argued before the district court that “boss” and “projection” were commensurate in scope, even characterizing “projection” limitations as “boss” terms in its Markman submissions. Having taken that position below, Barrette could not reverse course on appeal.
With respect to “nub” and “series of axles,” the court acknowledged that these terms were narrower than “boss,” but concluded that narrowing did not help Barrette. If the broader term was limited to integral structures, then the narrower terms necessarily were as well. Thus, even assuming some error in the district court’s interchangeable-use analysis, the outcome remained the same.
Indefiniteness: Sliding and “Causes”
On cross-appeal, Fortress challenged the district court’s rejection of its indefiniteness arguments. Fortress contended that the “sliding” terms were functional and ambiguous, and that the claims failed to specify parameters such as force, friction, or degree of motion.
The Federal Circuit disagreed. Applying Nautilus, Inc. v. Biosig Instruments, Inc. and Sonix Technology Co. v. Publications International, Ltd., the court emphasized that definiteness requires reasonable certainty, not mathematical precision. The claims and specification provided sufficient guidance by describing how pivoting of the pickets causes the connector to slide along the rail, and by illustrating those interactions in multiple figures.
Similarly, the court rejected Fortress’s argument that the term “causes” was indefinite because not every act of pivoting necessarily resulted in sliding. The court held that Barrette’s explanation during prosecution merely clarified the causal relationship in context, and that a skilled artisan could ascertain the scope of the term with reasonable certainty.
Practical Takeaways
The Federal Circuit’s decision delivers several practical lessons.
First, prosecution disclaimer remains a potent doctrine, and it applies with full force to arguments, not just amendments. Second, disclaimers can propagate across an entire patent family, even retroactively affecting earlier-issued patents. Third, examiner disagreement only matters if it clearly signals that the applicant’s narrowing characterization was incorrect and accepted as such by the applicant.
Charles Gideon Korrell believes that this case will encourage applicants to think more carefully about whether an argument is truly worth making in a continuation application. In many cases, the safer course may be to amend claims explicitly or to draft continuation claims that clearly delineate different scopes, rather than relying on argumentative distinctions that may later become shackles.
In the end, Barrette lost not because its invention lacked merit, but because its own words during prosecution narrowed its claims beyond repair. As patent families continue to grow larger and more complex, this decision serves as a sharp reminder: every prosecution argument is a potential legacy.
