`search_patent_assignments`

Pack: patents · Connect: https://pipeworx.io/mcp (see Connect below for a single-pack URL)

No MCP client? Call it directly: GET https://gateway.pipeworx.io/v1/tools/search_patent_assignments for the schema, then POST the same URL with its arguments for the data.

Search USPTO-recorded patent assignment/conveyance history by assignee, assignor, a granted patent number, or an application number — one of the four is required. Unlike get_patent_assignments (which needs an application number you already have), this answers “what has company X been assigned” or “who assigned patent Y”. An assignee/assignor search returns one row per recorded assignment (reel/frame, conveyance, dates, the other party) and additionally resolves the covered property (application/patent number, title) for each one it returns via a follow-up lookup — capped by limit because each one is a separate upstream call. A patent_number/application_number search returns the full assignment chain for that one property directly. An assignee/assignor with no recorded assignments returns a plain zero with the upstream total, not an error — USPTO assignment coverage is uneven for older or never-assigned properties. Individual (non-corporate) assignee addresses are omitted; company addresses are kept. Powered by the USPTO Assignment Search system (public, no account or key required).

Parameters

Name	Type	Required	Description
`assignee`	string	no	Company or person the patent was assigned TO (the recipient). Partial/substring match. Example: “Amyris”.
`assignor`	string	no	Company or person who assigned the patent AWAY (the inventor or prior owner). Partial/substring match. Example: “Musk”
`patent_number`	string	no	A granted US patent number, digits only. Example: “10000000”.
`application_number`	string	no	A US application number, digits only or formatted. Example: “15000001”, “15/000,001”.
`limit`	number	no	Maximum assignment records to return (default 10, max 25). For an assignee/assignor search this also bounds the number of follow-up property lookups, so a higher limit costs more upstream calls.
`_apiKey`	string	no	Not used by this tool — USPTO Assignment Search is keyless. Present only for schema parity with the other tools in this pack.

Example call

Arguments

{
  "assignee": "Amyris",
  "limit": 3
}

curl

curl -X POST https://gateway.pipeworx.io/patents/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"search_patent_assignments","arguments":{"assignee":"Amyris","limit":3}}}'

TypeScript (@pipeworx/sdk)

import { Pipeworx } from '@pipeworx/sdk';
const pipeworx = new Pipeworx();

const result = await pipeworx.call('search_patent_assignments', {
  "assignee": "Amyris",
  "limit": 3
});

More examples

{
  "patent_number": "10000000",
  "limit": 3
}

Connect

Add this to your MCP client config — every tool in the catalog, including this one — or use one-click install buttons:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://pipeworx.io/mcp"
    }
  }
}

Connect to just the patents pack

{
  "mcpServers": {
    "patents": {
      "url": "https://gateway.pipeworx.io/patents/mcp"
    }
  }
}

See Getting Started for client-specific install steps.

search_patent_assignments