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USPTO Patent Application Assignment Records
USPTO Patent Application Assignment Records is a paid API for AI agents from agents.x402stock.xyz, paid per call via MPP, $0.02/call, status unknown (last checked 2026-09-14).
Returns all recorded ownership transfers (assignments) for a given USPTO patent application, including conveyance details, assignors, assignees, and document links.
Price / call$0.02
Success—
StatusUnknown
How this service works
Recorded ownership transfers (assignments) for one patent application — pass the `{application}` number. Each carries the reel/frame, conveyance text, received & recorded dates, assignors, assignees (with location), and the recorded-document link. A patent sale, collateral pledge, or M&A signal the price/filing feeds miss. Source: USPTO. From x402stock, a market & economic data API (x402, USDC).
Output
A JSON object containing the application number, source (USPTO), timestamp, total assignment count, and an array of assignment records. Each record includes the reel/frame identifier, conveyance text (e.g. 'ASSIGNMENT OF ASSIGNORS INTEREST', 'SECURITY AGREEMENT'), received and recorded dates, list of assignor names, list of assignees with name and location, and a URL to the recorded document on USPTO.
Example use cases
M&A patent portfolio due diligence
“I'm evaluating an acquisition target — can you pull all the recorded assignments for patent application 17456789 so I can see if there are any collateral pledges or prior ownership transfers I should know about?”
Tracking a competitor's patent sales
“Has Apple or any of its subsidiaries recently received a transfer of patent application 15234567? Show me the full assignment history including assignor names and conveyance types.”
Startup IP ownership verification
“We're doing investor due diligence on a startup — can you check the USPTO assignment records for patent application 16987654 to confirm ownership is cleanly held and hasn't been pledged as collateral?”
Technical details
Endpoint
GEThttps://agents.x402stock.xyz/api/v1/patent/{application}/assignmentsWhen to prefer
Use this endpoint when you need authoritative, USPTO-sourced records of who has owned, pledged, or transferred a specific patent application — particularly useful for M&A due diligence, competitive intelligence, IP chain-of-title research, and detecting collateral pledges or security agreements that don't appear in standard patent or SEC filing feeds. Prefer this over general patent search tools when you have a specific application number and need granular assignment-level data with document links.
Side effects
- Invalid or non-existent application number returns empty assignments array or error
- Application number with no recorded assignments returns count of 0 and empty array
- Malformed application number string may return a 400 or empty result
- USPTO data source unavailability may cause upstream timeout or 503
- Payment failure via x402/USDC will prevent the request from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| applicationrequired | string | The application path parameter. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| as_ofrequired | string | |
| countrequired | number | |
| sourcerequired | string | |
| assignmentsrequired | array | |
| attributionrequired | string | |
| application_numberrequired | string |
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