The Jimi Hendrix song, “Purple Haze” contains one of the most famous misheard lyrics of all time. Ever fixated on sex and sexuality, many people insist that when he sings, “Excuse me while I kiss the sky,” he is saying, “Excuse me while I kiss this guy.” Kiss the sky and kiss this guy are near-homophones, that is to say, they are phrases that nearly sound alike. In the trademark world, homophones and near-homophones can create or contribute to a likelihood of confusion which, in turn, can result in a denial of registration to one of the marks and/or infringement liability.
Jimi Hendrix also wrote a song called Love or Confusion, but that is a story for a different day. See In re Peace and Love World Live, LLC.
Sunkist Growers v. Intrastate Distributors
Intrastate Distributors, Inc. applied to register KIST, both as a standard character mark and as a stylized mark, for soft drinks. Sunkist, Inc. filed an opposition to registration with the Trademark Trials and Appeals Board (TTAB), arguing that KIST is confusingly similar to SUNKIST, when used in connection with beverages. The TTAB dismissed the opposition, finding no likelihood of confusion.
On July 23, 2025, the U.S. Federal Circuit Court of Appeals reversed.
The DuPont Factors
Likelihood of confusion is a question of law that requires weighing of findings of fact on the DuPont factors. This list of factors comes from E.I. DuPont de Nemours v. Celanese Corp., a 1973 case that identified 13 factors relevant to likelihood-of-confusion analysis:
- Similarity of the marks
- Nature of the goods and services
- Trade channels
- Conditions of purchase (e.g., whether buyers of the product or service are likely to carefully consider options before purchasing, or are more likely to make a quick or impulsive purchasing decision.)
- Fame
- Number of similar trademarks used with similar goods or services
- Actual confusion
- History of concurrent use, if any
- Variety of different products and services with which the trademark is used
- Interactions and relationship between the applicant and the trademark owner
- Extent of the applicant’s right to prevent others from using the trademark on specific goods or services
- Potential confusion
- Any other relevant information.
The analysis may focus on dispositive factors, such as similarity of the marks and relatedness of the goods. Also, as a general rule, the more related the goods or services are, the less similar the marks need to be to support a finding of likelihood of confusion.
In this case, the Board found four factors supported a finding of likelihood of confusion, but determined that KIST and SUNKIST were dissimilar. The Board believed they had different commercial impressions. KIST, the Board believed, referenced a kiss, while SUNKIST referenced the sun.
The Board relied on some of IDI’s marketing materials that depict a pair of lips adjacent to the word KIST. The Court of Appeals, however, noted that lips do not appear next to the word in all of the marketing materials. Nor was the image of lips claimed as part of the trademark. Therefore, the Court held that the Board’s finding that KIST references a kiss was not supported by substantial evidence.
The Court also determined that Sunkist did not always depict an image of a sun adjacent to its mark SUNKIST.
In short, when considered as standard character marks, not as design marks, SUNKIST and KIST are substantially similar and consumers are likely to confusedly believe that beverages using either of these marks come from the same source.
Confusing Similarity
Two marks may be confusingly similar if they are similar as to appearance, sound, meaning, or commercial impression. (TMEP 1207.01(b).) The test is not whether the two marks are linguistically distinguishable, but whether they are likely to give a consumer the impression that there is a commercial connection between them.
When assessing the likelihood of confusion between compound words, courts may appropriately identify a part of the term as the dominant part and other parts as peripheral. If the dominant part is distinctive, then greater weight may be assigned to the similarity between the dominant parts of two marks than to the peripheral parts. Thus, for example, regarding CYNERGIE and SYNERGY PEEL, the TTAB determined that SYNERGY was the dominant part of both marks, and that CYNERGIE and SYNERGY were sound-alikes. Consequently, they were confusingly similar. (TEMP 1207.01(b)(viii).)
Although the Court of Appeals did not invoke this particular rationale in its KIST decision, it seems to me that this doctrine also would support a determination that KIST and SUNKIST are confusingly similar. KIST is the dominant part of both marks and it is distinctive.
Conclusion
Changing the spelling of, or adding or subtracting peripheral parts from, an existing trademark is not often likely to solve a likelihood of confusion problem, particularly when the goods or services are identical, similar, or related. A standard character trademark search should look not only for identical matches but also for words and phrases which, although not identical, might look or sound similar, in whole or in part, or have meanings similar to the one you are trying to clear.
