check us trademark status via uspto tsdr api

Steps

1. No authentication is required for public TSDR data; all endpoints are open REST.
2. Fetch the status and bibliographic data for a trademark by serial number via GET https://tsdrapi.uspto.gov/ts/cd/casestatus/{serialNumber}/info.xml (or .json for JSON format).
3. Parse the response for fields including markVerbalElementText, caseStatusDescriptionText, ownerName, and internationalClassNumber to extract key trademark details.
4. Retrieve prosecution history documents (office actions, responses) via GET https://tsdrapi.uspto.gov/ts/cd/casedocs/{serialNumber}/documents.json; each entry includes a documentIdentifier and a link to the PDF.
5. To search by mark text or owner rather than serial number, use the TESS web search or the USPTO's experimental search APIs; TSDR itself requires a known serial or registration number.