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Patent Searching, Advanced

Databases for Searching Patents and Patent Applications

USPTO

Use PatFT to search for U.S. patent grants, and AppFT to search for U.S. patent applications. Note that PatFT only allows for full-text searching back to 1976; to find patents granted before then, you must search by classification.  Browse or search the Cooperative Patent Classification (CPC) database to find relevant classification schemes.

Google Patents

Allows for full-text searching of patent grants and applications from the United States and from 100+ patent offices around the world.

Espacenet

Searches through patent documents filed with the European Patent Office, along with 81 other jurisdictions.

WIPO Patentscope

The PATENTSCOPE database provides access to international Patent Cooperation Treaty (PCT) applications in full text format on the day of publication, as well as to patent documents of participating national and regional patent offices.

USPTO's 7-Step Strategy

The United States Patent and Trademark Office (USPTO) recommends a Seven Step Strategy for conducting preliminary searches of U.S. patents and published applications using free online resources of the USPTO and its bi-lateral partner EPO (European Patent Office).

Seven Step Strategy Handout and Tutorial

Fielded Searching from the USPTO Advanced Search Screen

Google Patents Advanced Search