Free patent search: US, Europe and India
Search runs at search.patentassist.ai: AI agentic search, classic field search and full text across the USPTO, EPO and IP India. Free to start, no signup needed.
One patent search for the USPTO, EPO and IP India
Search more than 20 million US, European and Indian patent documents from one box, with an AI agent or classic field search, and read the full text of each record.
United States (USPTO)
Granted US patents and pre-grant publications, from the USPTO Open Data Portal.
- Title, applicant, inventor, examiner, CPC and number search
- Filing date range
- Claims, description, continuity, assignments and file wrapper documents on each record
Europe (EPO)
EP applications and granted European patents, from the EPO's Open Patent Services.
- Title and abstract words, applicant, inventor, CPC, IPC and number search
- Publication date range
- Claims, description and patent family on each record
India (IP India)
1,000,000+ applications and granted patents published by the Indian Patent Office.
- Title, abstract, complete specification, applicant, inventor and IPC search
- Filing, publication, grant and priority date ranges
- Parsed claims, application status and the IP India documents
Four ways to search
Describe the invention
Write what the invention does in plain language. The AI agent plans keyword and classification queries for each office you pick, reads the closest records and returns a ranked shortlist with the reason each one matched.
Classic field search
When you know what you want, search by title, applicant, inventor, classification or number and combine fields with AND, OR and NOT.
Start from a document
Upload a PDF of a draft, disclosure or paper and the AI agent searches from its text.
Search by classification
CPC for US and European records and IPC for European and Indian records. A class search is the most reliable way to sweep a whole technical field.
Use it with the official databases
The free official and public databases cover more documents. Use this search for a fast, ranked first pass across three offices, then confirm in the database that covers your field.
- USPTO Patent Public Search Full-text search of US patents and published applications, run by the USPTO. Requires a USPTO account sign-in from November 7, 2026.
- Espacenet The EPO's free database of more than 150 million patent documents from around the world, with machine translation.
- Google Patents 120M+ publications from 100+ offices, with full text from 22 of them and non-patent literature from Google Scholar and Books.
Browse Indian Patents
Every Indian application has its own page with claims, status and drawings. Start from a company, a university or a technology class.
Patent search: questions
Is this patent search free?
Yes. You can search without an account, within a weekly allowance of plain and AI searches. PatentAssist subscribers search on their plan's credits.
Which patent offices can I search?
The USPTO (granted US patents and pre-grant publications), the EPO (EP applications and granted European patents) and IP India (Indian applications and granted patents), in one search or one office at a time. When the AI agent searches the EPO it can also return Chinese, Japanese, WIPO and US publications that the EPO holds.
How is this different from Patent Public Search, Espacenet or Google Patents?
Those databases cover more documents. This search adds an AI agent that writes the queries for you and explains why each result matched, and it shows the US prosecution data and Indian application status on each record. For an exhaustive search, use it alongside the official databases.
What is the difference between the USPTO, the EPO and IP India?
Each grants rights for its own territory. The USPTO grants US patents. The EPO grants European patents for its 40 member states, which take effect nationally where they are validated, or as a Unitary Patent in participating EU states. IP India grants patents for India. A patent in one does not protect the invention in the others.
Can I search by CPC or IPC classification?
Yes. US records use CPC, European records carry both CPC and IPC, and Indian records use IPC. Enter a code such as A61K or H04L in the classification field.
Does a search here replace a professional patentability or FTO search?
No. It finds and ranks documents quickly. Judging novelty, inventive step or infringement against them is work for a registered patent attorney or agent.
Draft the application next
When the prior art search is done, PatentAssist drafts the claims, description and drawings in USPTO, EPO, DPMA or IP India format.
Try AI patent draftingSources, checked 25 October 2026: the USPTO, EPO and Google pages linked above, and the EPO notice on its 40th member state.