Lanham Act 43(a): Trademark, Trade Dress, and False Advertising

Section 43(a) of the Lanham Act, codified at 15 U.S.C. § 1125(a), gives you two federal causes of action against deceptive commercial conduct: one for false designation of origin, which covers unregistered trademark and trade dress infringement, and one for false advertising. You do not need a federal trademark registration to sue under either prong. That is what makes Section 43(a) one of the most heavily used provisions in federal intellectual property law — anyone with a commercial stake who is damaged by a competitor’s misleading conduct can bring a claim.

Both prongs share the same threshold. The challenged conduct has to occur “in commerce,” it has to involve a false or misleading representation of fact, and the plaintiff must be someone “who believes that he or she is or is likely to be damaged” by it.

The Trademark and Trade Dress Prong

Section 43(a)(1)(A) covers conduct likely to confuse consumers about who makes, sponsors, or is affiliated with a product or service. It protects any word, symbol, device, or combination used in commerce, whether or not it is registered.¹ That includes unregistered brand names, logos, slogans, and trade dress.

Trade dress is the overall commercial look of a product or its packaging: the shape of a bottle, a color scheme on a retail storefront, the layout of a restaurant interior. If a competitor copies those visual elements closely enough that consumers associate the copy with the original brand, this prong provides a remedy.

Secondary Meaning

Not every brand element qualifies. Marks that merely describe a product — “Crispy Chips” for potato chips, for example — have to clear an extra hurdle called secondary meaning, sometimes called acquired distinctiveness. Secondary meaning exists when consumers have come to associate the term or design primarily with a particular source rather than the product category itself. Courts weigh how long the mark has been in use, how much advertising has stood behind it, consumer survey evidence, and whether the owner can show substantially exclusive and continuous use over a meaningful period.

Marks that are inherently distinctive do not need to prove secondary meaning. Fanciful names like “Kodak,” arbitrary ones like “Apple” for computers, and suggestive marks that hint at a quality without directly describing it are protected as soon as they are used in commerce.

Functionality

Trade dress claims face one more gate. The claimant must prove the design features at issue are not functional. If a product’s shape exists because it works better that way — an ergonomic grip, a spout that pours cleanly — competitors cannot be blocked from using that shape. The statute puts this burden on the party asserting trade dress protection.² This keeps trademark law from being used as a backdoor patent on useful product features.

The False Advertising Prong

Section 43(a)(1)(B) targets misrepresentations about the nature, characteristics, qualities, or geographic origin of goods or services made in commercial advertising or promotion.¹ Print ads, television spots, social media campaigns, product labeling, and comparative advertising that distorts a competitor’s performance or ingredients all fall within the prong.

Literal Falsity Versus Implied Falsity

The distinction between literally false and implicitly misleading statements shapes how a case gets proven. When an ad makes a statement that is flatly untrue on its face — “Our battery lasts 48 hours” when testing shows 19 — courts presume consumers were deceived. No survey evidence is needed. The plaintiff proves the claim is false and moves on.

When the statement is technically true but creates a misleading impression, the plaintiff has to produce extrinsic evidence, usually a consumer survey, showing that a significant portion of the audience actually took away the false message. This is where many false advertising claims get expensive, and where they often fail. “9 out of 10 dentists recommend our toothpaste” might be literally true but misleading if the recommendation was for toothpaste generally, not that brand. Without survey data, the case stalls.

Puffery and Materiality

Not every exaggerated claim is actionable. Puffery — subjective, vague boasting that no reasonable consumer would take as a factual guarantee — falls outside the statute. “The best coffee in America” is puffery. “Contains 50% more caffeine than the leading brand” is a verifiable factual claim. If there is no way to prove the statement true or false, courts treat it as promotional enthusiasm consumers have learned to discount.

The plaintiff also has to show materiality: that the misrepresentation is the kind of claim likely to influence a purchasing decision. An ad that misstates an irrelevant detail no consumer cares about fails materiality even if demonstrably false.

Who Can Sue

The Supreme Court set the standing test for Section 43(a) claims in Lexmark International, Inc. v. Static Control Components, Inc. (2014). It applies to both prongs and has two parts.³

Zone of interests. The plaintiff must allege an injury to a commercial interest in reputation or sales. Ordinary consumers generally cannot bring Lanham Act claims. The statute protects competitors and others with a direct commercial stake, not end users.
Proximate cause. The plaintiff must show that its economic or reputational injury flows directly from the defendant’s deceptive conduct. Harm that is purely derivative — a supplier hurt only because its customer lost sales — is usually too remote.

The practical effect is that Section 43(a) is a tool for businesses harmed by a competitor’s dishonesty, not a consumer protection statute. Consumer class actions alleging false advertising typically rely on state law instead.

What a Plaintiff Has to Prove

Use in Commerce

Every claim requires conduct occurring “in commerce,” meaning commerce Congress can regulate. In practice that covers virtually any commercial activity crossing state lines or affecting interstate trade.⁴ Purely local, intrastate conduct may fall outside the statute, though courts read the requirement broadly.

Likelihood of Confusion

The central question in a trademark or trade dress case is whether the defendant’s use is likely to confuse consumers about source, sponsorship, or affiliation. Courts apply a multifactor balancing test. The factors vary slightly by circuit, but the widely used version considers:⁵

Strength of the plaintiff’s mark. A well-known, highly distinctive mark gets broader protection.
Similarity of the marks in appearance, sound, and meaning.
Relatedness of the goods or services. Identical or complementary products raise the confusion risk.
Overlap in marketing channels. Products sold in the same stores or advertised through the same media are more likely to confuse buyers.
Consumer sophistication. Buyers of expensive, specialized products tend to be careful and harder to confuse.
Defendant’s intent. Knowingly adopting a mark to trade on someone else’s reputation weighs heavily against the defendant.
Evidence of actual confusion. Documented instances are strong proof, though not required.

No single factor decides the case. A court might find high similarity but low relatedness of goods and conclude confusion is unlikely, or find moderate similarity plus clear intent to copy and reach the opposite result.

Burden of Proof

Section 43(a) claims are civil actions decided under the preponderance of the evidence standard. The plaintiff has to show it is more likely than not that the defendant’s conduct violated the statute. That is a lower bar than the “clear and convincing evidence” standard used in some other intellectual property contexts.

Defenses

Descriptive Fair Use

A defendant can use another party’s trademark without liability if the use is descriptive rather than trademark-indicating. The statutory fair use defense under 15 U.S.C. § 1115(b)(4) requires three things: the term was used other than as a trademark, it was used fairly and in good faith, and it was used only to describe the defendant’s own goods, services, or geographic location.⁶ A honey producer using the word “honey” to describe its product can invoke this defense even if a competitor has trademarked “Honey” for a line of cereals.

The Supreme Court held in KP Permanent Make-Up v. Lasting Impression I (2004) that some degree of consumer confusion is compatible with fair use. The defendant does not have to prove confusion is unlikely to establish the defense.

Nominative Fair Use

Nominative fair use applies when a party uses another’s trademark to refer to the trademark owner’s actual product. A repair shop advertising “We service BMW vehicles” is using the BMW mark nominatively. Courts generally require that the product cannot be readily identified without the mark, the user employs only as much of the mark as necessary, and the user does nothing to suggest sponsorship or endorsement by the mark owner.

Remedies

Injunctions

Courts have broad power to issue injunctions stopping ongoing violations. Since the Trademark Modernization Act, plaintiffs benefit from a rebuttable presumption of irreparable harm once they establish a violation (for permanent injunctions) or a likelihood of success on the merits (for preliminary injunctions and temporary restraining orders).⁷ Before that change, plaintiffs in many circuits had to independently prove irreparable harm, a hurdle that frequently delayed relief.

Monetary Recovery

A winning plaintiff can recover the defendant’s profits from the infringing conduct, its own actual damages, and the costs of the lawsuit. To reach profits, the plaintiff only has to prove the defendant’s gross sales. The defendant then bears the burden of proving any costs or deductions to reduce that figure. Courts can enhance damages up to three times the actual amount proven, though the statute characterizes these awards as compensation rather than a penalty.⁸

Destruction of Infringing Materials

Under 15 U.S.C. § 1118, a court can order the surrender and destruction of all labels, packaging, signs, advertisements, and the plates, molds, or other tools used to produce them.⁹ The order eliminates the physical means of continued infringement, not just the conduct itself.

Attorney Fees

The Lanham Act permits courts to award reasonable attorney fees to the prevailing party in “exceptional cases.”⁸ The statute does not define “exceptional,” but courts have applied it to cases involving bad faith, willful infringement, or litigation conduct that stands out from the norm. Fee-shifting is not automatic even for winning plaintiffs.

Timing: No Statute of Limitations, but Laches Applies

The Lanham Act does not include a statute of limitations. In theory you can bring a Section 43(a) claim years after the infringing conduct began. In practice, courts apply the equitable doctrine of laches — unreasonable delay in filing that prejudices the defendant — as a check on stale claims.⁶ Courts usually look to the analogous state statute of limitations as a guideline. File within that window and delay is presumed reasonable. Wait longer and the burden shifts to you to explain why.

A defendant raising laches generally has to show two things: that the delay was unreasonable, and that it caused actual prejudice, such as lost evidence, investments made in reliance on the plaintiff’s silence, or business built around the disputed mark during the gap. Laches can bar both monetary recovery and injunctive relief, so sitting on known infringement carries real risk.

1
Office of the Law Revision Counsel. 15 USC 1125 – False Designations of Origin, False Descriptions, and Dilution Forbidden
2
Office of the Law Revision Counsel. 15 USC 1125 – False Designations of Origin, False Descriptions, and Dilution Forbidden – Section: Subsection (a)(3)
3
Justia Law. Lexmark International Inc v Static Control Components Inc, 572 US 118
4
Office of the Law Revision Counsel. 15 US Code 1127 – Construction and Definitions, Intent of Chapter
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Ninth Circuit District and Bankruptcy Courts. Model Civil Jury Instructions – 15.18 Infringement, Likelihood of Confusion, Factors, Sleekcraft
6
Office of the Law Revision Counsel. 15 USC 1115 – Registration on Principal Register as Evidence of Exclusive Right to Use Mark
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Office of the Law Revision Counsel. 15 USC 1116 – Injunctive Relief
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Office of the Law Revision Counsel. 15 USC 1117 – Recovery for Violation of Rights
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Office of the Law Revision Counsel. 15 USC 1118 – Destruction of Infringing Articles