Finding Patents: Research Guide

Best Bet! Indexes U.S. patents from 1790s to recent months. Includes full-text when freely available. Use the Advanced search and Prior Art Finder for improved results.

The database includes information about all US patents (including utility, design, reissue, plant patents and SIR documents) from the first patent issued in 1790 to the most recent issue week. pre-1976 can only search by patent # and class code

Offers access to more than 90 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today

Mainly USPTO patents but has RSS feeds to help you stay current/alert

Search 51 million patent documents including 2.8 million published international patent applications (PCT). Allows for searching in multiple languages

PQAI stands for Patent Quality through Artificial Intelligence. A collaborative initiative to build a common AI-based prior-art search tool.