What Claude (Anthropic) with web search answered for patent-search services (startups) on 2026-09-10

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-10

Coverage: Claude (Anthropic) with web search. Other engines not included.

The question asked, verbatim: best patent-search services for startups

Brands named, in the order the engine gave

1. Google Patents mentioned
   Google Patents: Start here.
2. Espacenet mentioned
   Espacenet (European Patent Office): Use it for worldwide coverage.
3. Lens.org mentioned
   The Lens (Lens.org): Search is free and it covers patents plus academic papers.
4. PQAI mentioned
   PQAI: A free AI search tool.
5. UpCounsel mentioned
   (UpCounsel (https://www.upcounsel.com/patent-search-cost), CASRAI (https://casrai.org/guides/patentability-search-cost), Murgitroyd (https://www.murgitroyd.com/us/services/managed-services/patent-searching))
6. PatSnap mentioned
   Probably skip for now: PatSnap and Derwent Innovation.
7. Derwent Innovation mentioned
   Probably skip for now: PatSnap and Derwent Innovation.

Sources the engine cited

The answer, as recorded

For most startups I'd use free databases for your own early searching, then pay a professional for one search before you spend money on filing. **Free tools to search yourself** 1. **Google Patents**: Start here. It's free, fast, lets you search by keyword, inventor, date or classification, and covers full text from 17 patent offices (about 87 million patents). It's the quickest way to find out whether your idea already exists. ([UMD guide](https://lib.guides.umd.edu/patent_tm/patent_search_tips)) 2. **Espacenet** (European Patent Office): Use it for worldwide coverage. It has over 110 million documents from 97 countries, groups related filings of the same invention across countries, and machine-translates between English and 31 languages. That matters if competitors file in Asia or Europe. ([Espacenet](https://worldwide.espacenet.com/), [GreyB](https://greyb.com/blog/patent-databases-best-search-platforms/)) 3. **The Lens (Lens.org)**: Search is free and it covers patents plus academic papers. Papers are often the prior art that sinks a deep-tech patent. If you need saved workspaces or analytics, the professional plan is about $1,000 a year, far below enterprise tools. ([Beyond Elevation](https://beyondelevation.com/blog/posts/best-patsnap-alternatives-2026/), [UT Austin guide](https://guides.lib.utexas.edu/c.php?g=532337&p=3642395)) 4. **USPTO Patent Public Search**: This is the US Patent Office's own tool. Its advanced mode supports detailed queries and tagging, which helps once you know which classification codes matter to you. ([USPTO](https://www.uspto.gov/patents/search/patent-public-search)) 5. **PQAI**: A free AI search tool. You describe your invention in plain language and it finds similar patents even when they use different wording, which is a useful check on keyword searches. One caveat: the ranking article I found was published by PQAI itself. ([projectpq.ai](https://projectpq.ai/top-ai-patent-search-tools-2026/)) **Free expert help** 6. **USPTO Patent and Trademark Resource Centers**: Trained patent librarians, often at public or university libraries, will teach you search techniques one-on-one for free, in person or by phone. ([USPTO legal assistance](https://www.uspto.gov/learning-and-resources/patent-and-trademark-practitioners/intellectual-property-legal-assistance), [Free Library BRIC](https://libwww.freelibrary.org/programs/bric/patents-trademarks)) 7. **USPTO Patent Pro Bono Program and Law School Clinics**: If you meet the income limits, the Pro Bono Program pairs you with a volunteer patent attorney. About 19 certified law school clinics also provide free patent help to US residents. ([USPTO](https://www.uspto.gov/learning-and-resources/patent-and-trademark-practitioners/intellectual-property-legal-assistance), [Utah guide](https://campusguides.lib.utah.edu/patents/pro-bono)) **Paid, once you're serious** 8. **A professional patentability search from a search firm or patent attorney**: Pay for this before filing. A search with a written opinion usually costs about $1,000-$5,000, most often $1,500-$3,000, and biotech or chemistry tends to cost more. Search firms charge less for the search itself, but an attorney's legal opinion on the results costs extra. Fixed-fee options exist, such as Murgitroyd. ([UpCounsel](https://www.upcounsel.com/patent-search-cost), [CASRAI](https://casrai.org/guides/patentability-search-cost), [Murgitroyd](https://www.murgitroyd.com/us/services/managed-services/patent-searching)) **Probably skip for now:** **PatSnap** and **Derwent Innovation**. They're powerful but built for corporate IP departments, at roughly $30K-$80K a year. PatSnap Eureka's free basic plan is fine to try. ([Beyond Elevation](https://beyondelevation.com/blog/posts/best-patsnap-alternatives-2026/)) Keep in mind that checking whether you can patent something is different from checking whether you can sell your product without infringing someone else's patent (a "freedom-to-operate" search). If that's your worry, have an attorney do the second kind. Also, many "best tools" lists online are written by the vendors themselves, so treat their rankings with some skepticism. Sources: - [projectpq.ai - Top AI Patent Search Tools 2026](https://projectpq.ai/top-ai-patent-search-tools-2026/) - [GreyB - Top 18 Patent Databases](https://greyb.com/blog/patent-databases-best-search-platforms/) - [UMD - Quick Guide to Free Patent Search](https://lib.guides.umd.edu/patent_tm/patent_search_tips) - [UT Austin - Patent Searching Databases](https://guides.lib.utexas.edu/c.php?g=532337&p=3642395) - [Espacenet](https://worldwide.espacenet.com/) - [USPTO - Patent Public Search](https://www.uspto.gov/patents/search/patent-public-search) - [Beyond Elevation - PatSnap Alternatives 2026](https://beyondelevation.com/blog/posts/best-patsnap-alternatives-2026/) - [UpCounsel - Patent Search Cost](https://www.upcounsel.com/patent-search-cost) - [CASRAI - Patentability Search Cost](https://casrai.org/guides/patentability-search-cost) - [Murgitroyd - Patent Search Services](https://www.murgitroyd.com/us/services/managed-services/patent-searching) - [USPTO - IP Legal Assistance Programs](https://www.uspto.gov/learning-and-resources/patent-and-trademark-practitioners/intellectual-property-legal-assistance) - [Free Library of Philadelphia - BRIC Patents & Trademarks](https://libwww.freelibrary.org/programs/bric/patents-trademarks) - [University of Utah - Pro Bono Legal Assistance](https://campusguides.lib.utah.edu/patents/pro-bono)

Markdown edition · the question page, with every recording · Answer Watch · AEO Watch

Answer Watch records what one AI answer engine said on one date, nothing more. Each page names the engine and the model, carries the date the question was asked, and lists the brands that appeared in the answer in the order the engine gave them, with the sources it cited. It is a measurement, not a ranking, not a recommendation and not a claim about the world. Brands that did not appear in an answer are not named on any public page. Coverage: Claude (Anthropic) with web search. Other engines not included.