Patent APIs
Patent information and search
This directory lists 4 patent APIs. Use the filters below to narrow by authentication, HTTPS support and CORS. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.
Best Patent APIs for Developers
A patent API allows developers to search patent databases, retrieve full patent documents, track IP portfolios, and analyze patent landscapes programmatically. These APIs serve legal tech platforms, R&D tools, and competitive intelligence applications.
For deep European patent data, the EPO Open Patent Services API covers bibliographic, legal status and full text records straight from Espacenet, though it needs a free registered app and an OAuth2 token. The USPTO Open Data Portal is the broadest free option for US patent, trademark and PTAB data, now also hosting the former PatentsView API for structured queries over US grants and applications. Developers outside the US and Europe can check TIPO, Taiwan's free open data download site for patent and trademark records in XML.
The main pitfall across patent APIs is data freshness and coverage gaps: national offices publish on different schedules and some fields lag weeks behind the official register, so cross check anything used for legal or filing decisions against the source office.
What to check before you pick one
- Full-text search: APIs that search within patent claims and descriptions provide more precise results than title-only search.
- Classification support: CPC and IPC classification codes let you narrow searches to specific technology domains.
- Legal status data: Knowing whether a patent is active, expired, or abandoned is critical for IP research and freedom-to-operate analysis.
Frequently Asked Questions
What are patent APIs?
Patent APIs provide programmatic access to patent databases, allowing developers to search patents by keyword, inventor, assignee, or classification and retrieve full patent documents and legal status information.
Is the USPTO patent API free?
Yes. The USPTO Patent Full-Text Database API and PatentsView API are free to use. They cover millions of US patents with metadata, claims, abstracts, and inventor information.
Can I search international patents through an API?
Yes. The European Patent Office (EPO) OPS API provides access to the Espacenet patent database covering patents from over 100 countries. A free registration provides access to millions of international patent documents.