Trademark Search

Look up US trademark status and details via the USPTO TSDR system

Look up US trademark applications and registrations via the USPTO Trademark Status & Document Retrieval (TSDR) system. Supports lookup by serial number or registration number. Returns mark text, owner, goods/services, Nice classes, filing/registration dates, attorney of record, and mark images.

Look up a trademark

Endpoint

POST /legal/v1/trademark-search

cURL

curl -X POST https://api.case.dev/legal/v1/trademark-search \
  -H "Authorization: Bearer $CASEDEV_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "serialNumber": "97123456"
  }'

You can also look up by registration number:

cURL

curl -X POST https://api.case.dev/legal/v1/trademark-search \
  -H "Authorization: Bearer $CASEDEV_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"registrationNumber": "6789012"}'

Key parameters

Parameter	Type	Description
serialNumber	string	USPTO serial number (e.g. “97123456”)
registrationNumber	string	USPTO registration number (e.g. “6789012”)

Provide either serialNumber or registrationNumber. If both are provided, serialNumber takes precedence.

Response fields

Field	Type	Description
serialNumber	string	USPTO serial number
registrationNumber	string | null	Registration number (if registered)
markText	string | null	Text of the trademark
markType	string | null	Type (Standard Character Mark, Design Mark, etc.)
status	string | null	Current status (Registered, Pending, Abandoned, etc.)
statusDate	string | null	Date of most recent status update
filingDate	string | null	Filing date
registrationDate	string | null	Registration date
owner	object | null	Owner name, address, and entity type
attorney	string | null	Attorney of record
goodsAndServices	array	Goods/services with class numbers
niceClasses	number[]	Nice classification class numbers
imageUrl	string | null	URL to the mark image
usptoUrl	string	Canonical TSDR link

See the API reference for the full response schema.