A knockout search is the first pass you do before spending $400 on a USPTO filing fee, and before falling in love with a name that is already taken. It is not a substitute for a full attorney clearance search, but it will save you from the most embarrassing mistakes.
Here is how to do one in about thirty minutes.
What a knockout search is
A knockout search has one job: find the obvious deal-breakers before you invest any more time. You are looking for identical or near-identical marks already registered or applied for in the classes you care about, plus any common-law uses prominent enough to block you.
What it is not: a comprehensive clearance search. That is what a trademark attorney does, and it covers state registrations, foreign marks, common-law uses across thousands of databases, and phonetic similars. The full search is what protects you from a costly opposition or cancellation down the road. The knockout just makes sure you are not wasting your time on a name that is clearly off the table.
Step 1: Search the USPTO TESS database
Go to the USPTO Trademark Electronic Search System (TESS) and run a basic word-mark search on your exact mark.
Then run variations:
- Drop spaces (BlueCloud vs. Blue Cloud).
- Try common misspellings.
- Try the singular and plural.
- Try the mark with and without descriptive words (Acme Software then Acme).
For each hit, note the status (live, dead, abandoned), the class, the goods or services description, and the filing date. You are looking for live marks in classes related to yours. A dead mark in your class is not a problem unless it was abandoned recently, abandoned marks can sometimes be re-registered by the original owner.
Step 2: Search the classes that matter
USPTO classifies trademarks into 45 classes. Classes 1 through 34 are goods; 35 through 45 are services. Software is class 9, legal services is class 45, advertising and business services is class 35, and so on.
Your mark gets blocked by an existing registration in your class, and sometimes in a related class. If you are filing a software mark in class 9, an existing class 42 (computer services) registration for the same name is also a problem, because consumers are likely to be confused. The legal standard is likelihood of confusion, and it cuts across class boundaries when the goods or services are closely related.
Identify the two or three classes most relevant to what you actually do, and search each.
Step 3: Search phonetic and visual similars
Two marks do not have to be identical to block each other, they have to be confusingly similar. The USPTO uses a multi-factor test, but for a knockout, focus on three things:
- Sound: Krispy and Crispy sound the same. Sun and Sunn do too.
- Appearance: 0racle with a zero looks like Oracle.
- Meaning: Lazy Dog and Sleepy Dog mean approximately the same thing.
Run searches for each phonetic equivalent you can think of. The TESS Free Form Search lets you use wildcards.
Step 4: Check common-law uses
A trademark does not have to be registered to block you. Anyone who has used a mark in commerce has common-law rights in the geographic area where they have used it. To check:
- Google the exact mark and close variants.
- Search the relevant industry trade directories.
- Search domain registrars for any business-active website at the .com (and .ai, .io, .co if relevant).
- Search LinkedIn, Crunchbase, and SEC EDGAR for company names.
- Check Amazon, the App Store, Google Play, and Etsy if your goods are sold on those platforms.
A common-law user in another state generally cannot block your federal registration entirely, but they can carve out their geographic area, meaning you will never be able to use the mark there without infringing.
Step 5: Check state databases
State trademark registries are separate from the federal USPTO database. Most states have a searchable online registry through the Secretary of State. If a business in your home state has registered the same mark there, it is a sign you may have problems even if the USPTO database is clean.
What to do with what you find
After thirty minutes, you will have one of three outcomes:
Clear: no live registrations, no significant common-law uses, no near-identical marks in related classes. Proceed to a full clearance search before filing.
Yellow flags: live marks in adjacent classes, common-law uses in distant markets, or a dead mark that was abandoned within the last year. These need attorney evaluation. Some can be navigated; some cannot.
Red: an identical or nearly identical live registration in your exact class. Pick a different name. Trying to register over a clear conflict will burn through your filing fee and likely draw an opposition or office action.
When to hire an attorney
Even when the knockout comes back clean, a full clearance search before you file is worth the cost. The TESS database does not catch every common-law use, design marks are not searchable by appearance, and the likelihood-of-confusion analysis depends on a lot of factors that are not obvious to non-specialists.
The clearance search and the filing itself are usually a flat-fee engagement at $1,000 to $2,500, much cheaper than fighting an office action without representation.
If you would like to be matched with a trademark attorney in your state, LawSensai can help.