Likelihood of confusion
See also: confusing similarity
Likelihood of confusion is the legal test for whether consumers might mistake one mark for another, assessed on the similarity of the marks and of the goods or services. It is why a name does not have to be identical to a prior mark to be blocked.
In practice
Similarity is judged in sight, sound and meaning together, and against the goods concerned. A name that merely sounds like an established mark in the same category can be refused, which is why phonetic neighbours are screened rather than only exact strings.
The USPTO gives two concrete anchors. For sound, it names "T. Markey" and "Tee Marquee" as marks that can be pronounced alike despite different spelling. For goods, it points out that similar marks alone are not enough: Dove soap and Dove ice cream bars coexist because the goods are unrelated. Both halves of the test have to be met, which is why the same word can be fine in one category and blocked in another. How that plays out for a given name is something you have to check yourself; this entry is orientation only.
In a naming project, the mistake is searching for the name and nothing near it. A coined name that is one letter away from a category leader is a likelier problem than an identical word in an unrelated field. We check spelling variants, sound-alikes and translations against the competitive set, and we treat a close neighbour in the target category as a reason to drop the name, not to hope.
Where this sits in the process
The studio treats this as part of a single run rather than a separate service: the category is read, the creative direction is chosen from what the research found, candidates are generated in volume and then cut against criteria that were written down first. See how the studio works for what that produces, or the naming module for the stages themselves.
Related concepts
- Trademark clearance: What full clearance involves, and why it is a manual process that the owner of the name is responsible for.
- Nice Classification: Trademark rights are granted per class, not per word.
- Phonetics: The sound structure of a name: what phonetics governs and which failures it predicts before launch.
Frequently asked questions
What is likelihood of confusion in trademark law?
Likelihood of confusion is the test for whether consumers are likely to mistake one mark for another and believe the goods or services come from the same source. It looks at how similar the marks are and how related the goods or services are.
Does a trademark have to be identical to be refused?
No. Marks that are similar in appearance, sound or meaning can be refused if the goods or services are related. The USPTO notes that two marks can be pronounced alike even when spelled differently.
Can two companies use the same brand name?
Sometimes. The USPTO points to Dove soap and Dove ice cream bars as an example: the same mark can coexist where the goods are unrelated. Related goods in the same market are where conflicts arise.
How do you check for likelihood of confusion before naming?
Search the registers for identical names, then for variants in spelling, sound and meaning, in the classes your business uses. Judging whether a near match is dangerous takes care, and register entries are outside the automated checks, so assess the names on your shortlist yourself.
Sources
- [1]Likelihood of confusion— USPTO