Trademarks

Crocs v. Effervescent: When Calling Your Product 'Patented' Becomes False Advertising

The Federal Circuit held that a false claim that a product feature is 'patented' can support a Lanham Act false-advertising claim — provided it misleads consumers about the nature, characteristics, or qualities of the goods, not merely their authorship.

April 3, 2026
Molded foam clog shoes on a retail display shelf
Crocs marketed its Croslite foam as 'patented,' 'proprietary,' and 'exclusive' — a claim a competitor turned into a false-advertising counterclaim. Shutterstock
Educational content, not legal advice. This article explains general legal concepts. It does not create an attorney–client relationship. For your specific situation, consult a licensed attorney.

Crocs, Inc. v. Effervescent, Inc., No. 2022-2160 (Fed. Cir. Oct. 3, 2024), is a deceptively narrow opinion with broad consequences for how companies talk about their intellectual property in the marketplace. On appeal from the U.S. District Court for the District of Colorado, the United States Court of Appeals for the Federal Circuit — in an opinion by Judge Reyna, joined by Judge Cunningham and by Judge Albright of the Western District of Texas sitting by designation — reversed summary judgment against a competitor’s false-advertising counterclaim. The court held that a seller who falsely tells the buying public that a product feature is “patented,” and links that claim to the product’s advantages, may be liable for false advertising under Section 43(a)(1)(B) of the Lanham Act. The decision threads a needle the lower court had missed: distinguishing impermissible claims about who made something (governed by Dastar) from actionable claims about what the thing is.

At a glance

  • Case: Crocs, Inc. v. Effervescent, Inc. (and Double Diamond Distribution, Ltd.; U.S.A. Dawgs, Inc.; Mojave Desert Holdings, LLC), No. 2022-2160
  • Court: U.S. Court of Appeals for the Federal Circuit, on appeal from the District of Colorado
  • Decided: October 3, 2024; opinion by Judge Reyna (Cunningham, J., and Albright, J. (W.D. Tex., by designation))
  • Holding: A cause of action arises under § 43(a)(1)(B) where a party falsely claims it possesses a patent on a product feature and advertises that feature in a way that misleads consumers about the nature, characteristics, or qualities of the product
  • Disposition: Summary judgment for Crocs on the false-advertising counterclaim reversed and remanded
  • Why it matters: Marketing copy that touts goods as “patented,” “proprietary,” or “exclusive” is not categorically immune under Dastar; it can be false advertising when it speaks to product qualities

How the dispute arose

The litigation began as a patent case. Crocs, the maker of the ubiquitous molded foam clog, sued a group of competitor distributors — including U.S.A. Dawgs — for patent infringement in the District of Colorado. The competitors, referred to collectively as Dawgs, counterclaimed for false advertising under Section 43(a) of the Lanham Act, 15 U.S.C. § 1125(a).

The gravamen of the counterclaim was a marketing message. Crocs advertised that its footwear was made from a material it calls “Croslite,” and described that material as “patented,” “proprietary,” and “exclusive.” Crocs conceded it held no patent directed to Croslite. Dawgs alleged that by describing the material as patented and then attributing a list of performance benefits to it — comfort, odor resistance, and similar qualities said to be present in all Crocs products — Crocs misled consumers into believing that competing footwear made from comparable molded foam was inferior, second-rate, or merely an imitation.

The district court granted summary judgment to Crocs on the counterclaim. Relying on the Supreme Court’s decision in Dastar Corp. v. Twentieth Century Fox Film Corp., 539 U.S. 23 (2003), and the Federal Circuit’s own decision in Baden Sports, Inc. v. Molten USA, Inc., 556 F.3d 1300 (Fed. Cir. 2009), the court reasoned that a false claim of being “patented” is functionally a false claim of authorship or inventorship — and that Dastar forecloses dressing up such claims as false advertising. On that view, asserting a patent that does not exist is no different from claiming credit for an innovation, a grievance the Lanham Act does not redress.

False advertising under § 43(a)(1)(B) and the Dastar problem

Section 43(a) of the Lanham Act creates two distinct unfair-competition torts. Subsection (a)(1)(A) addresses false association and confusion as to origin, sponsorship, or approval. Subsection (a)(1)(B) — the false-advertising prong at issue in Crocs — reaches a person who, in commercial advertising or promotion, “misrepresents the nature, characteristics, qualities, or geographic origin of his or her or another person’s goods, services, or commercial activities.” The statutory phrase “nature, characteristics, qualities” is the fulcrum of the case.

Dastar sits at the intersection of trademark and copyright. There, the Supreme Court held that “origin” in § 43(a) refers to the producer of the tangible goods sold, not to the author of any idea, concept, or communication embodied in those goods. The decision was designed to keep the Lanham Act from becoming a perpetual, federal-common-law substitute for copyright and patent — preventing plaintiffs from policing uncredited copying of public-domain content through a trademark theory. Baden Sports extended that logic to the false-advertising prong, holding that Dastar bars a § 43(a)(1)(B) claim premised on a defendant’s false assertion that it, rather than the plaintiff, was the source of an innovation. In Baden, the alleged falsehood — calling a basketball “innovative” — went to authorship of an idea, not to a characteristic of the ball.

The district court read that line of authority to swallow Dawgs’ counterclaim. The Federal Circuit disagreed, and the disagreement is the heart of the opinion.

The holding: authorship is not the same as quality

The Federal Circuit drew a careful distinction. Dawgs was not complaining that Crocs falsely claimed to have invented or authored Croslite — the kind of inventorship grievance Dastar and Baden foreclose. Dawgs was complaining that Crocs’ “patented,” “proprietary,” and “exclusive” labeling, joined to a list of touted benefits, misled consumers about the nature, characteristics, or qualities of the footwear itself: that the shoes were materially different from, and better than, the competition because they alone possessed a legally protected, one-of-a-kind material.

That, the court held, is squarely within § 43(a)(1)(B). The court framed the rule directly: a cause of action arises under § 43(a)(1)(B) where a party falsely claims it possesses a patent on a product feature and advertises that feature in a manner that causes consumers to be misled about the nature, characteristics, or qualities of its product. The word “patented,” in other words, was not operating in the opinion as a stand-alone inventorship boast; it was operating as a quality signal — a promise to consumers that the product had attributes competitors could not lawfully replicate. Because that promise spoke to what the shoes are rather than who made them, Dastar and Baden did not bar the claim. The court reversed and remanded.

Importantly, the decision is about the viability of the theory, not its ultimate merits. On remand, Dawgs must still prove the conventional false-advertising elements — including that the statements were false or misleading, material, and caused or were likely to cause injury — and confront the literal-falsity-versus-misleading distinction discussed below.

Literal falsity, misleadingness, and standing

The opinion is best understood against the settled architecture of a § 43(a)(1)(B) claim, which the remand will require Dawgs to satisfy. Courts recognize two routes to liability. A statement that is literally false — false on its face — permits a court to presume consumer deception without survey evidence. A statement that is literally true but misleading requires the plaintiff to prove that the message actually deceived or tended to deceive a substantial segment of the audience, ordinarily through consumer-perception evidence. The “patented” claim here has a literal-falsity dimension (Crocs held no such patent) but its deceptive force depends on the implied quality message it carried, which sounds in misleadingness.

Standing remains governed by Lexmark International, Inc. v. Static Control Components, Inc., 572 U.S. 118 (2014). A false-advertising plaintiff must fall within the Lanham Act’s “zone of interests” — an injury to a commercial interest in reputation or sales — and must show proximate cause, meaning an economic injury flowing directly from deception of consumers. As a direct competitor in the molded-foam footwear market alleging diverted sales and disparagement, Dawgs fits comfortably within Lexmark’s framework.

Open questions

  • How tight must the link be? The opinion turns on Crocs joining “patented” to specific product benefits. Whether a bare, unembellished “patented” label — without an attached qualities pitch — can support § 43(a)(1)(B) liability remains unsettled.
  • Interaction with false-patent-marking law. The federal false-marking statute, 35 U.S.C. § 292, already polices marking unpatented articles as patented. Crocs opens a parallel, competitor-driven Lanham Act avenue with different standing and remedies; the overlap will need to be mapped.
  • The reach beyond “patented.” The court’s logic plausibly extends to “trademarked,” “copyrighted,” or “proprietary” claims whenever they double as quality signals — but the boundary is undefined.
  • Circuit alignment. Commentators note that the decision sharpens, rather than resolves, tension among the circuits about how far Dastar reaches into false-advertising theory; the Supreme Court has so far declined to take up the question.

Implications

  • Audit marketing copy for IP claims. Words like “patented,” “proprietary,” and “exclusive” are now litigation-sensitive when paired with product-benefit messaging. Confirm the IP exists and covers what the ad implies.
  • Mind patent expiration and scope. A once-true “patented” claim becomes false when the patent expires or never covered the advertised feature; calendaring and copy review should be linked.
  • Competitors have a new lever. Rivals can frame false IP boasts as false advertising under § 43(a)(1)(B), with access to disgorgement, damages, and injunctive relief — not just § 292 marking remedies.
  • Plead to the quality message. Plaintiffs should anchor the claim to the nature, characteristics, or qualities of the goods to stay clear of the Dastar/Baden authorship bar.
  • The Federal Circuit applies regional-circuit Lanham Act law. Because the appeal rode in on a patent case, the court applied the relevant regional circuit’s false-advertising standards — a reminder that forum can shape the analysis.

Frequently asked questions

Does this mean any false “patented” claim is automatically false advertising? No. The court did not hold that mislabeling a product “patented” is, by itself, a Lanham Act violation. It held that such a claim can support a § 43(a)(1)(B) action when it is tied to and misleads consumers about the product’s nature, characteristics, or qualities. A bare inventorship-style boast, untethered from product qualities, would still face the Dastar and Baden Sports bar — and the plaintiff must still prove the conventional false-advertising elements.

How does this fit with the false-marking statute, 35 U.S.C. § 292? They are complementary. Section 292 imposes penalties for marking unpatented articles as patented and has its own standing and damages rules. Crocs recognizes a separate Lanham Act theory available to commercial competitors, which can offer broader relief — disgorgement of profits, actual damages, and injunctions — when the false patent claim functions as deceptive advertising about product qualities.

What does a competitor have to prove on remand? The standard false-advertising elements: a false or misleading statement of fact in commercial advertising; that it actually deceived or tended to deceive a substantial audience (or was literally false); materiality; placement in interstate commerce; and injury or likely injury. Standing must satisfy Lexmark’s zone-of-interests and proximate-cause requirements.

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