You searched the register, found your name, and your stomach dropped. Then you looked closer and the owner sells something nothing like what you sell. Does that stop you?
Often, no. Identical marks coexist across unrelated fields constantly. DELTA is an airline and a tap manufacturer. DOVE is a soap and a chocolate bar. Neither pair confuses anybody, because nobody buying chocolate wonders whether the soap company made it.
What matters is not whether the words match. It is whether a buyer would think the two came from the same place.
Relatedness does the work, and classes do not
The most common error is reading the class number. Applications are filed in one of 45 international classes, and it is tempting to treat a different class as a different world. It is not. Classes organize filings and set fees. The same class contains things with nothing to do with one another, and genuinely related products are often split across classes. What a class does decide is what your registration covers and what you pay, and you can look up the class for what you sell in a few seconds.
What an examining attorney actually asks is closer to commercial reality:
- Do these sell through the same channels, to the same buyers?
- Are they complementary, used together, bought on the same trip?
- Is it normal for one company to offer both under a single brand?
- Does the register itself show other companies doing exactly that?
That last point catches people out. If the examiner can find registrations showing software companies also selling consulting under the same mark, then software and consulting are related for this purpose, whatever your instinct says.
The buyer matters as much as the product
Two factors quietly move the line. Care: someone choosing industrial equipment after months of evaluation is less likely to be confused than someone grabbing a drink at a petrol station, so ordinary consumer goods are judged more strictly. Strength: a coined mark gets a wide berth, while a mark built from ordinary words that dozens of businesses already use gets a narrow one, because buyers have learned to tell those apart by small differences. That is the crowded field problem.
Where the different-industry argument fails
- The other mark is famous. Dilution protection reaches past confusion entirely, and can stop uses on goods the owner has never sold.
- Natural expansion. Protection covers where the owner would plausibly go next, not only where it sits today.
- The fields are closer than you think. Apparel and accessories. Software and the service it automates. Beer and restaurants, which the Board has found related many times.
- You picked the name because of them. Intent is a factor, and borrowing the resonance of an existing brand tends to be visible in the record.
Natural zone of expansion
Relatedness is not frozen at what the other business sells today. Examiners and courts also weigh where an owner would naturally grow, which is why a coffee roaster and a cafe are related even if the roaster has never served a cup. The question is whether buyers would find it unremarkable for one company to do both.
This cuts hardest in categories where brand extension is routine. Apparel into accessories, a restaurant into bottled sauces, software into consulting: all are normal enough that the second step does not surprise anyone. If your field is one where extension is expected, "different industry" is a weaker argument than it looks.
Consent agreements, and their limits
Two businesses that genuinely do not overlap can sign a consent agreement, in which each acknowledges the other and they agree on boundaries: territories, channels, goods, sometimes logo styling. The USPTO gives real weight to a detailed one, because the parties know their market better than an examiner does.
Two cautions. A bare consent, which says only "we do not object", carries much less weight than one explaining why confusion is unlikely and what each side will do to prevent it. And a consent binds the parties who signed it, so if the other mark is sold, you are relying on an agreement that travelled with it.
If you decide to proceed
Two things make coexistence more durable. Describe your goods narrowly: an identification saying exactly what you sell, rather than sweeping in a whole class, reduces the overlap an examiner can find and is far harder to argue with later. And build the difference into the brand in look, tone and trade channel, so the separation is real rather than asserted.
Some businesses in this position negotiate a coexistence agreement. That is a real instrument with real terms, and it is worth having a trademark attorney draft it rather than adapting something found online, because the clauses that matter are the ones about future expansion.