If you own a trademark that another business is using without permission, your first instinct may be to pursue a trademark dilution claim. But dilution is a narrow legal theory reserved for a specific category of marks, and the evidentiary bar is high. Unlike a traditional infringement claim — where you prove that consumers are likely to be confused between two marks — a dilution claim under the Trademark Dilution Revision Act requires you to prove something different: that the other party’s use weakens the distinctiveness or tarnishes the reputation of your famous mark. Knowing what courts look for before you file can save significant time and money.

Trademark Dilution vs. Trademark Infringement: Key Differences

Trademark dilution is governed by the Trademark Dilution Revision Act of 2006 (TDRA), codified at 15 U.S.C. § 1125(c), which amended the Lanham Act. Unlike infringement under 15 U.S.C. § 1114, which protects any registered mark from likely consumer confusion, dilution protection is available only for “famous” marks — those with widespread recognition among the general consuming public of the United States.

The Supreme Court addressed the evidentiary standard in Moseley v. V Secret Catalogue, Inc., 537 U.S. 418 (2003), holding that the original dilution statute required proof of actual dilution. Congress responded by passing the TDRA in 2006, which replaced the “actual dilution” standard with a “likelihood of dilution” standard, making claims somewhat more workable but still requiring substantial evidence. The two recognized forms of dilution are blurring and tarnishment.

Step One: Prove Your Trademark Is Famous

The threshold requirement for any dilution claim is fame. Under 15 U.S.C. § 1125(c)(2)(A), a mark is famous if it is “widely recognized by the general consuming public of the United States as a designation of source of the goods or services of the mark’s owner.” This is a demanding standard — niche fame within an industry or a regional market is not enough.

In assessing fame, courts consider factors including:

• The duration, extent, and geographic reach of advertising and publicity for the mark
• The volume of sales of goods and services identified by the mark
• The extent of actual recognition by the general public
• Whether the mark is federally registered under 15 U.S.C. § 1052

Evidence to support a fame finding typically includes advertising records showing the scope and spending of your marketing campaigns, sales data demonstrating substantial commercial use, consumer recognition surveys, media coverage in national publications, and the length of time the mark has been in continuous use. Marks like Kodak, Tiffany, and McDonald’s have been recognized as famous; marks known only within a specific trade or region typically are not.

Step Two: Establish That the Defendant’s Use Began After Your Mark Became Famous

Timing matters under the TDRA. Dilution protection applies only to uses that commenced after the mark became famous. You must establish both when your mark achieved widespread national recognition and when the defendant began using the allegedly diluting mark.

Useful evidence on timing includes trademark registration dates, advertising campaign launch records, sales volume timelines, product launch dates, website archives from the Wayback Machine, and the defendant’s own corporate filings, domain registration records, or marketing materials showing when they started using the mark. If the defendant’s use predates your mark’s rise to fame, your dilution claim will likely fail regardless of the similarity between the marks.

Step Three: Prove Dilution by Blurring or Tarnishment

Dilution by Blurring

Dilution by blurring occurs when a third party’s use of a mark similar to a famous mark causes consumers to associate the famous mark with a new, different source — gradually eroding its uniqueness. The Second Circuit’s analysis in Starbucks Corp. v. Wolfe’s Borough Coffee, Inc., 736 F.3d 198 (2d Cir. 2013), identified six factors courts consider under 15 U.S.C. § 1125(c)(2)(B):

• The degree of similarity between the marks
• The degree of inherent or acquired distinctiveness of the famous mark
• The extent to which the owner of the famous mark is engaging in substantially exclusive use of the mark
• The degree of recognition of the famous mark
• Whether the user of the mark intended to create an association with the famous mark
• Any actual association between the two marks

Evidence in a blurring case often includes consumer surveys showing that respondents associate the junior mark with the famous brand, documents from the defendant showing intentional adoption of a similar mark, and proof that the famous mark had a long history of exclusive use before the defendant entered the market.

Dilution by Tarnishment

Dilution by tarnishment occurs when a mark similar to a famous mark is used in a way that harms the famous mark’s reputation — typically by associating it with inferior products, offensive content, or conduct that the famous brand’s owner would find objectionable. Under 15 U.S.C. § 1125(c)(2)(C), tarnishment means “association arising from the similarity between a mark or trade name and a famous mark that harms the reputation of the famous mark.”

Evidence in a tarnishment case may include screenshots or recordings of the defendant’s use, customer complaints or social media posts showing the negative association, expert testimony explaining how the use damages brand reputation, and evidence that the defendant’s products or services are of lower quality than those associated with the famous mark.

What Kind of Evidence Courts Find Most Persuasive

Across both blurring and tarnishment claims, courts consistently look for objective, quantifiable evidence rather than the trademark owner’s subjective beliefs about their own brand’s fame or the harm they suffered. The most persuasive forms of evidence include:

• Consumer surveys. Properly designed and conducted surveys showing levels of brand recognition or demonstrating the association consumers draw between the marks are often the most important evidence in a dilution case. Survey methodology must be rigorous — courts scrutinize design flaws carefully.
• Sales and advertising records. Documented advertising expenditures, national campaign reach, and historical sales volume establish the commercial scale of the famous mark.
• Trademark registration records. Federal registration is a factor in the fame analysis and supports the timeline of the mark’s use.
• Media coverage. Articles, broadcast segments, and press recognition showing the mark’s presence in national media help establish general public recognition.
• Expert testimony. Experts in marketing, consumer behavior, or the relevant industry can help courts understand market impact and the significance of the association between marks.
• Defendant’s own communications. Internal emails, marketing plans, or other documents showing that the defendant intentionally chose a similar mark to leverage the famous brand’s recognition are powerful evidence of intent — one of the blurring factors under the TDRA.

What Is Usually Not Enough

Understanding what courts reject is as important as knowing what they accept. Evidence that typically falls short in a dilution claim includes:

• Fame within a niche industry or regional market without evidence of general public recognition
• Evidence that the defendant’s use began before or at the same time your mark achieved widespread fame
• Claims based solely on the visual similarity of the marks without evidence of actual association or harm
• Anecdotal statements from employees or the trademark owner about perceived harm, without corroborating survey or market data

If your mark is well-known but not famous in the § 1125(c) sense, a traditional infringement claim under § 1114 — which requires showing likelihood of confusion, not dilution — may be a more viable path. An experienced trademark attorney can help you evaluate which theory fits your facts.

Contact the Trademark Attorneys at Revision Legal

For more information about trademark dilution claims and brand protection, contact the experienced trademark lawyers at Revision Legal. We help brand owners evaluate their claims, build the evidence necessary to pursue them, and enforce their intellectual property rights. You can reach us through the form on this page or by calling (855) 473-8474.