`search_maintenance_fee_events`

Pack: patent-maintenance-fees · 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_maintenance_fee_events for the schema, then POST the same URL with its arguments for the data.

Search USPTO maintenance-fee events across patents by event code, patent-number prefix, and/or event-date range — e.g. all ‘EXP.’ (expired for non-payment) events in a date window. Returns an exact total_matching count first, then a capped sample of the actual event rows (newest first) — never a bare empty array on zero matches; the filters tried are always echoed back. Sourced from USPTO’s Patent Maintenance Fee Events (public domain); every response carries data_as_of. Keyless.

Parameters

Name	Type	Required	Description
`event_code`	string	no	Exact USPTO event code, e.g. “EXP.” (expired, non-payment), “EXPX” (reinstated), “M1551” (4th-year large-entity payment).
`patent_number_prefix`	string	no	Patent-number prefix, e.g. “10835” or “RE4”. Digits only unless a reissue “RE” prefix.
`date_from`	string	no	Event date lower bound, inclusive, YYYY-MM-DD.
`date_to`	string	no	Event date upper bound, inclusive, YYYY-MM-DD.
`limit`	number	no	Max sample rows to return (default 50, max 200).

Example call

Arguments

{
  "event_code": "EXP.",
  "date_from": "2026-01-01",
  "date_to": "2026-03-31"
}

curl

curl -X POST https://gateway.pipeworx.io/patent-maintenance-fees/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"search_maintenance_fee_events","arguments":{"event_code":"EXP.","date_from":"2026-01-01","date_to":"2026-03-31"}}}'

TypeScript (@pipeworx/sdk)

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

const result = await pipeworx.call('search_maintenance_fee_events', {
  "event_code": "EXP.",
  "date_from": "2026-01-01",
  "date_to": "2026-03-31"
});

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 patent-maintenance-fees pack

{
  "mcpServers": {
    "patent-maintenance-fees": {
      "url": "https://gateway.pipeworx.io/patent-maintenance-fees/mcp"
    }
  }
}

See Getting Started for client-specific install steps.

search_maintenance_fee_events