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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.

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Look up a trademark

Endpoint
POST /legal/v1/trademark-search

// Look up by serial number
const result = await client.legal.trademarkSearch({
  serialNumber: '97123456',
});

console.log(`${result.markText} — ${result.status}`);
console.log(`Owner: ${result.owner?.name}`);
console.log(`Classes: ${result.niceClasses.join(', ')}`);

for (const gs of result.goodsAndServices) {
  console.log(`  Class ${gs.classNumber}: ${gs.description}`);
}
You can also look up by registration number: 
const result = await client.legal.trademarkSearch({
  registrationNumber: '6789012',
});

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Key parameters

ParameterTypeDescription
serialNumberstringUSPTO serial number (e.g. “97123456”)
registrationNumberstringUSPTO registration number (e.g. “6789012”)
Provide either serialNumber or registrationNumber. If both are provided, serialNumber takes precedence.

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Response fields

FieldTypeDescription
serialNumberstringUSPTO serial number
registrationNumberstring | nullRegistration number (if registered)
markTextstring | nullText of the trademark
markTypestring | nullType (Standard Character Mark, Design Mark, etc.)
statusstring | nullCurrent status (Registered, Pending, Abandoned, etc.)
statusDatestring | nullDate of most recent status update
filingDatestring | nullFiling date
registrationDatestring | nullRegistration date
ownerobject | nullOwner name, address, and entity type
attorneystring | nullAttorney of record
goodsAndServicesarrayGoods/services with class numbers
niceClassesnumber[]Nice classification class numbers
imageUrlstring | nullURL to the mark image
usptoUrlstringCanonical TSDR link
See the API reference for the full response schema.