# US Patent Lookup by Assignee or Inventor

> US Patent Lookup by Assignee or Inventor is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.026/call, status unknown (last checked 2026-10-21).

Look up US granted patents by organization assignee or inventor name, returning patent ID, title, grant date, type, and assignees.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/legal/patents?utm_source=zero.xyz
- Price: $0.026/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-patent-lookup-by-assignee-or-inventor-32a0e471
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Tt02CAtfqR8XJw9hVMec3

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-patent-lookup-by-assignee-or-inventor-32a0e471
```

Example prompt: Can you find all US granted patents assigned to Google LLC and show me the patent IDs, titles, grant dates, and types?

## When to prefer this

Use this endpoint when you need structured patent data (IDs, titles, grant dates, types, assignees) for a named US organization or individual inventor, especially in legal research, competitive intelligence, or IP due diligence workflows. Prefer this over full-text patent search tools when you need clean, structured grant-level metadata rather than full patent documents.

## Known failure modes

- No patents found for the given name — returns empty list
- Ambiguous or misspelled assignee/inventor name resulting in zero or incorrect matches
- Rate limiting or payment failure due to x402 micropayment not completing
- Service unavailability returning a non-200 HTTP status

## How this service works

Look up US granted patents by organization assignee or inventor name, returning patent id, title, grant date, type and assignees.

## Output

A list of US granted patents matching the queried assignee or inventor, each including the patent ID, title, grant date, patent type (e.g. utility, design), and assignee names.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "cik": {
       "type": "string",
       "default": null,
       "description": "Optional SEC CIK id hint"
      },
      "qid": {
       "type": "string",
       "default": null,
       "description": "Optional Wikidata QID id hint"
      },
      "name": {
       "type": "string",
       "default": null,
       "description": "Organization name (used as assignee if assignee absent)"
      },
      "limit": {
       "type": "integer",
       "default": null,
       "maximum": 25,
       "minimum": 1,
       "description": "Max patents to return, default 10"
      },
      "assignee": {
       "type": "string",
       "default": null,
       "description": "Assignee organization name to match"
      },
      "inventor": {
       "type": "string",
       "default": null,
       "description": "Inventor last name to match instead of assignee"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-patent-lookup-by-assignee-or-inventor-32a0e471/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)