Opinions — Thursday, February 5, 2026

Little Giant Ladder Systems, LLC v. Tricam Industries, Inc. concerns U.S. Patent No. 10,767,416, which claims a multi-position ladder with a locking mechanism that includes a "cavity" feature designed to reduce finger pinching and improve ease of use. The Federal Circuit affirmed the district court's grant of summary judgment of noninfringement in favor of defendant Tricam, upholding both the claim construction of "cavity" and the exclusion of Little Giant's infringement expert. The court found no genuine dispute that Tricam's accused Speed Lock handle does not literally infringe the cavity limitation and that prosecution history estoppel bars infringement under the doctrine of equivalents.

The decision is notable for Little Giant's forfeiture of its broadest claim construction argument. Although Little Giant had "essentially agreed" below that "cavity" means "a hollowed-out space (not passing all the way through)," it attempted on appeal to remove the parenthetical limitation, arguing for a plain meaning construction of simply "a hollowed-out space." The court rejected this as forfeited under TVIIM and Wash World, holding that a party may not introduce new claim construction arguments on appeal or alter positions taken below. On the merits, the court declined to read "not passing all the way through" as requiring a directional qualifier ("in enough directions") or a concealment function, finding that the specification's figures—showing the hollowed space bounded at one end by the handle and blocked at the other by the rail—made clear the examiner's and district court's interpretation that the cavity does not pass through in any direction when properly configured.

The Federal Circuit affirmed the Western District of Texas's grant of summary judgment holding all asserted claims of Q Technologies' three related patents—U.S. Patents 9,635,108, 10,567,473, and 10,594,774—invalid as ineligible under 35 U.S.C. § 101. The patents claimed methods and systems for sharing content using unique identifiers, with limitations requiring location determination and proximity-based access control. Q Technologies argued the district court erred at both steps of the Alice framework by improperly characterizing the claims as abstract and by resolving disputed issues of fact regarding whether the location-based features were conventional.

The court's application of Alice step one turned on whether the additional location and proximity limitations rendered the claims directed to something other than the abstract idea of sharing content via unique identifiers. The Federal Circuit held these limitations merely constrained when or with whom sharing occurred, not how computer networks or file-sharing technology functioned, distinguishing technological improvements from result-focused applications of abstract ideas using conventional components. At step two, the court rejected Q Technologies' factual challenge to the "well understood, routine and conventional" finding, concluding that reliance on location information and a purported hybrid architecture failed to demonstrate nonconventional implementation or improved computer functionality, applying TLI Communications to affirm that recited physical components behaved exactly as expected according to their ordinary use.