Quick answer: A trademark serial number identifies a USPTO application, while a registration number is assigned after registration. Use the exact number you have in TSDR, then compare status, owner, goods or services, and documents.
Last checked: June 4, 2026. Registry Check Guide is not a government agency, regulator, certification body, law firm, or official registry. Use this page as a practical guide to read official records before you rely on them.
Official sources to start with
| Official source | Use it for |
|---|---|
| USPTO TSDR status and documents | Trademark application and registration status, documents, maintenance deadlines, and official USPTO guidance. |
| Trademark Status and Document Retrieval (TSDR) | Direct USPTO status and document lookup by serial number or registration number. |
What to check first
- Identify whether the number is labeled serial number, application number, registration number, or something else.
- Enter the number in TSDR and open the status page.
- Compare the owner, mark wording, goods or services, class, and status.
- Check documents for office actions, responses, publication, registration, or maintenance filings.
- If the number does not return a record, search by mark wording and owner as a fallback.
How to read the record
| Field or claim | How to interpret it |
|---|---|
| Serial number | Usually tied to the application record from filing onward. |
| Registration number | Assigned after the mark registers. |
| International registration | Can appear in TSDR for Madrid-related records. |
| Maintenance button | Useful for registered marks with post-registration deadlines. |
What this record does not prove
- A number alone does not prove ownership.
- A pending serial number does not prove registration.
- A registration number does not prove the mark covers every product category.
Red flags
- The number returns a different mark.
- The owner does not match the claimed owner.
- The record is dead, abandoned, cancelled, or expired.
Related checks
Trademark live vs dead status Trademark status check guide
FAQ
Can a trademark application have no registration number?
Yes. A pending application can have a serial number before any registration number is assigned.
Which number should I use for maintenance checks?
Use the registration number for registered marks when checking maintenance deadlines in TSDR.
Can I search by mark name instead?
Yes, but number searches reduce ambiguity when you have the exact serial or registration number.