D.C. Circuit Seven Factors – Lanham Act Likelihood of Confusion


Each of the thirteen federal courts of appeal have their own test for evaluating whether a likelihood of confusion exists between two trademarks. Although the tests are not identical, most of them are substantially similar and use many of the same factors. And the factors are non-exclusive. Generally, nine factors are considered in likelihood of confusion analysis for non-competitive goods.
  1. The likelihood that the actor’s goods, services or business will be mistaken for those of the other;
  2. The likelihood that the other may expand his business so as to compete with the actor;
  3. The extent to which the goods or services of the actor and those of the other have common purchasers or users;
  4. The extent to which the goods or services of the actor and those of the other are marketed through the same channels;
  5. The relation between the functions of the goods or services of the actor and those of the other;
  6. The degree of distinctiveness of the trademark or trade name;
  7. The degree of attention usually given to trade symbols in the purchase of goods or services of the actor and those of the other;
  8. The length of time during which the actor has used the designation; and,
  9. The intent of the actor in adopting and using the designation.
The test, however, depends on jurisdiction. Some common factors include:
  1. Strength of plaintiff’s mark: Arbitrary, suggestive, descriptive
  2. Similarity of marks: Sound, appearance and connotation
  3. Similarity of goods or services
  4. Defendant’s intent
  5. Actual confusion
  6. Sophistication of buyers or care exhibited by purchasers
Not all Factors are evenly weighted. They are fact dependent and subjectively tested on a case-by-case basis.

DC Circuit: Seven Factors

The District of Columbia District Court uses the following seven factors:
  1. The strength of the plaintiff’s mark;
  2. The degree of similarity between the two marks;
  3. The proximity of the products;
  4. Evidence of actual confusion;
  5. The defendant’s purpose or reciprocal good faith in adopting its own mark;
  6. The quality of defendant’s product; and,
  7. The sophistication of the buyers.
Globalaw Ltd. v. Carmon & Carmon Law Office, 452 F. Supp. 2d 1, 48 (D.D.C. 2006).

Rhonda Harper – Expert Witness

Rhonda Harper is routinely retained to formulate expert surveys, conduct rebuttal critiques, or construct rebuttal surveys to show the potential difference in results with properly designed and executed surveys.

Rhonda Harper has extensive experience and a deep understanding of survey design, sampling, question construction, data analysis, and methodological pitfalls that introduce bias or systematic error. Harper also provides guidance on how to approach the opposing expert’s deposition.

About Rhonda Harper LLC – Expert Witness

Located in Dallas, TX, Rhonda Harper has been retained by 95+ law firms since 2005. With a focus on Trademark and Trade Dress Infringement, Misleading and Deceptive Advertising, Licensing, and Commercial Reasonableness cases, Rhonda Harper has conducted hundreds of research studies, including 50+ Likelihood of Confusion and Secondary Meaning surveys. She has been deposed ~50 times and served in ~20+ trials and arbitrations.

For more information, call Rhonda Harper at 214-244-4608.