Can I search by assignee or inventor?

Yes, include it in q the way you would on Google Patents, for example assignee:"Example Energy" battery.

Does it return full patent text?

It returns metadata, snippet and a PDF link. Fetch the patent page with the Webpage to Markdown API if you need the full text.

Which patent offices are covered?

Whatever Google Patents indexes, including USPTO, EPO, WIPO and many national offices.

POST /v1/patents

Google Patents API

Search Google Patents and get each patent's publication number, title, assignee, inventor, priority, filing, grant and publication dates, and a PDF link.

Get a free API key Try in playground

1 credit per page of results 2,500 free credits, no card Failed calls are free

Overview

What the Google Patents API does

The Google Patents API returns Google Patents search results as JSON. Every result carries the publication_number, assignee, inventor, the four key dates (priority_date, filing_date, grant_date, publication_date), language and pdf_url.

It's a quick way to run prior-art searches or watch a competitor's filings without a patent database subscription.

What you get

results[] array: position, title, snippet, link, publication_number, priority_date, filing_date, grant_date, publication_date, inventor, assignee, language, pdf_url, thumbnail_url.
request object: Echo of the normalized request (endpoint, engine, q, country, language, page…), handy for logging.
meta object: request_id, credits_used, cached, engine, latency_ms, resolved_urls and parse_quality. parse_quality=empty means the call was not billed.

Request

POST /v1/patents

cURL

Python

TypeScript

fetch

PHP

curl https://api.serpkite.com/v1/patents \
  -H "Authorization: Bearer $SERPKITE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"q":"solid state battery electrolyte"}'

Response (illustrative, placeholder domains)

200 OK · application/json

{
  "request": {
    "endpoint": "patents",
    "engine": "google",
    "q": "solid state battery electrolyte",
    "page": 1
  },
  "results": [
    {
      "position": 1,
      "title": "Solid electrolyte composition and all-solid-state battery",
      "snippet": "A sulfide-based solid electrolyte with improved ionic conductivity and moisture stability…",
      "link": "https://patents.google.com/patent/US0000000A1/en",
      "publication_number": "US0000000A1",
      "priority_date": "2023-03-14",
      "filing_date": "2024-03-12",
      "publication_date": "2025-09-18",
      "inventor": "Jane Example",
      "assignee": "Example Energy Corp.",
      "language": "en",
      "pdf_url": "https://patentimages.example.com/US0000000A1.pdf"
    }
  ],
  "meta": {
    "request_id": "req_01J8ZK4M6Q2V7",
    "credits_used": 1,
    "engine": "google",
    "cached": false,
    "latency_ms": 812,
    "resolved_urls": true,
    "parse_quality": "ok"
  }
}

Every response also carries X-Credits-Used, X-Credits-Remaining, X-Cache and X-Tokens-Estimate headers. Run this query in the playground

Reference

Parameters

The parameters /v1/patents accepts, in the JSON body or the query string.

Google Patents API parameters
Name	Type	Default	Description
`q` required	string	–	The search query. Required. Up to 2,048 characters.
`num`	integer	10	Results per call. 10 per page; 100 fetches the top 100 as a depth bundle for 7 credits instead of 10. Values: 10, 20, 30, 50, 100.
`page`	integer	1	Results page, 1–10. Each page is billed separately.
`format`	string	json	Response format. markdown is LLM-ready prose; compact is JSON with only the fields agents need. Values: json, compact, markdown.
`fields`	string	–	Comma-separated projection, e.g. results.title,results.link,knowledge_graph. Cuts tokens.

Full reference, error codes and headers are in the API docs. Send a JSON array of up to 100 request objects to run them in one call.

Use cases

What people build with the Google Patents API

Prior-art search

Run quick novelty checks before drafting or filing.

Competitor watch

Monitor new publications by assignee in your technology area.

IP research agents

Let an agent collect and summarize relevant patents with PDFs.

Pricing