DuPont Factors FAQ: Common Questions on Trademark Likelihood of Confusion

This DuPont factors FAQ section provides clear, direct answers on how the USPTO and federal courts evaluate real-world likelihood-of-confusion issues. Use these expert-verified legal insights to understand specific criteria weights, the mechanics of coexistence agreements, and the sliding scale evaluation process.

Q: What are the 13 DuPont factors in plain English?

A: The DuPont factors are 13 criteria the USPTO uses to decide whether two trademarks are likely to confuse consumers about the source of goods or services. In plain English, they help examiners weigh how similar the marks are, how related the products are, where and how they’re sold, and other real-world marketplace realities. Here’s a simple breakdown of all 13:

• Factor 1: How similar the marks look, sound, mean, or feel overall (commercial impression).
• Factor 2: How related or similar the goods or services are in consumers’ minds.
• Factor 3: Whether the brands are sold through the same stores, websites, or trade channels.
• Factor 4: How carefully and thoughtfully buyers research before purchasing.
• Factor 5: How famous or well-known the existing mark already is.
• Factor 6: Whether many other similar marks already exist in the same field (a “crowded field”).
• Factor 7: Whether there is actual evidence that real consumers have been confused.
• Factor 8: How long the two marks have coexisted in the marketplace without problems.
• Factor 9: Whether the existing mark is used broadly across many types of products (house brand) or narrowly.
• Factor 10: Any agreements between the parties, such as consent or coexistence agreements.
• Factor 11: How strong the applicant’s own rights are to prevent others from using similar branding.
• Factor 12: How much real-world overlap or potential for confusion actually exists.
• Factor 13: Any other relevant facts about the marketplace not covered above.

Q: Do I need to win every DuPont factor to register my trademark?

A: No. The DuPont test is a qualitative balancing test, not a scorecard where you must win every factor. A USPTO examining attorney can refuse registration based on just one or two heavily weighted factors (especially Factors 1, 2, and 3) even if other factors favor your application. Conversely, strong evidence on the most important factors can often overcome weaker showings on others. The goal is to show that, overall, consumers are unlikely to be confused.

Q: Can identical or very similar marks coexist in different industries?

A: Yes, often they can. When goods or services are sufficiently unrelated, consumers are unlikely to assume the brands come from the same source, even if the marks are identical or highly similar. This is heavily influenced by DuPont Factor 2 (relatedness of goods/services) and Factor 3 (trade channels). Many well-known examples exist, such as “Delta” for both airlines and plumbing fixtures. However, extremely famous marks (Factor 5) can sometimes block registration even in distant fields.

Q: How important is Factor 6 (crowded field / third-party uses)?

A: Factor 6 is of medium weight but is very powerful in practice when strong evidence exists. If many third parties already use similar marks for similar goods or services, the prior mark is considered weaker, and consumers are better at distinguishing between them. Submitting evidence of a “crowded field” — such as active third-party registrations and real-world marketplace uses — is often one of the most effective ways to overcome a Section 2(d) refusal. This factor works especially well when combined with strong arguments on Factors 1 and 2.

Q: What’s the difference between DuPont factors and Polaroid/Sleekcraft factors?

A: The DuPont factors are the 13-factor framework used by the USPTO and the Trademark Trial and Appeal Board (TTAB) to examine trademark applications for likelihood of confusion under Section 2(d). Polaroid factors (used in the 2nd Circuit) and Sleekcraft factors (used in the 9th Circuit) are the multi-factor tests applied by those federal courts in trademark infringement lawsuits. All three are balancing tests that consider similar concepts — such as similarity of marks, relatedness of goods, and consumer sophistication — but they use different numbers of factors and slightly different wording. DuPont is more comprehensive and tailored for administrative examination, while the court tests vary by circuit and are used after registration in enforcement cases.

Q: Can a consent agreement overcome a Section 2(d) likelihood of confusion refusal?

A: Yes, a properly structured consent or coexistence agreement can be very persuasive, particularly under DuPont Factor 10. A bare statement of consent carries limited weight, but an agreement that includes meaningful limitations on goods, services, trade channels, or geographic scope demonstrates to the examining attorney that the parties have thoughtfully addressed potential confusion in the marketplace. Well-drafted agreements are often one of the strongest tools available to overcome a Section 2(d) refusal when the marks and goods are otherwise close. A bare statement of consent carries less weight than a structured coexistence agreement.

Q: What evidence helps most when responding to a Section 2(d) likelihood of confusion rejection?

A: The most effective evidence targets the specific DuPont factors the examining attorney relied on, with extra focus on Factors 1 (similarity of marks), 2 (relatedness of goods/services), 6 (crowded field), and 10 (consent agreements). Strong evidence includes side-by-side commercial impression comparisons, third-party registration and marketplace use evidence showing a crowded field, consumer declarations, sales data showing different trade channels or buyer sophistication, and a well-drafted coexistence agreement when available. Arguments should also invoke the sliding scale doctrine — showing that differences in one key factor can offset similarities in another.

Q: Do DuPont factors apply to common-law trademark rights or only federal registrations?

A: The DuPont factors themselves are the USPTO’s framework for examining federal trademark applications. However, the underlying legal standard — likelihood of confusion — applies broadly to both federal registrations and common-law trademark rights. Courts across the country use similar multi-factor balancing tests (such as Polaroid or Sleekcraft in their circuits) when enforcing common-law rights or deciding infringement cases. So while the exact 13-factor DuPont list is specific to USPTO examination, the core analysis of consumer confusion applies whether or not a mark is federally registered.

Q: How long do I have to respond to a Section 2(d) refusal?

A: You have three months from the issue date of the Office Action to file a response. You can request one three-month extension by filing a request and paying the fee before the original deadline expires, giving you up to six months total in most cases. Missing the deadline (including any granted extension) will cause your application to go abandoned. Madrid Protocol applications have a six-month response period with no extension option.

Q: Which DuPont factors are most important at the USPTO?

A: Factors 1, 2, and 3 (similarity of the marks, relatedness of goods/services, and trade channels) almost always carry the greatest weight.

Q: What is a “sophisticated buyer” in trademark law?

A: Under DuPont Factor 4, a sophisticated buyer is a consumer who exercises a high degree of care, budget, and deliberation before making a purchase. Highly sophisticated buyers are legally considered unlikely to be easily confused by similar brand names.

Q: What should I do if my trademark application is refused under the DuPont factors?

A: You must submit a formal legal response within the statutory deadline. Your response should systematically rebut the examiner’s position by highlighting the specific DuPont factors that favor your brand.

Q: Do the DuPont factors apply in court cases too?

A: Yes. Courts use the same 13-factor framework when deciding trademark infringement and unfair competition cases.

Q: Is actual confusion required to refuse my application?

A: No. The USPTO can refuse registration based on a likelihood of confusion even without evidence of actual consumer confusion.

Q: Which three DuPont factors carry the most weight at the USPTO?

Factors 1 (similarity of the marks), 2 (relatedness of the goods or services), and 3 (similarity of established trade channels) are almost always the most important. A strong showing on these three factors frequently decides the outcome of a Section 2(d) analysis.