A database maintained by the European Patent Office (includes U.S. patents) with more than 100 million patents from over 80 countries. Espacenet also offers a comprehensive Patent Classification search option. For more detail on how to search for patents by patent classification, see the video on the following web page: https://research.lib.buffalo.edu/patents/classification-searching.

Patent Lens (The Lens) offers patent searching and analysis for millions of patent records from over 95 different jurisdictions. This free and open database provides a modern search interface and offers some unique patent searching tools, notably gene sequence searching.

This patent database maintained by WIPO covers more than 67 million patents from over 50 countries and patent offices including European (EP) and World (PCT) patents. See National Collections - Data Coverage for a listing of the countries and data fields searched.

Special features include free online translation of patent texts using Google Translate and an innovative cross-lingual search capability that automatically translates search terms into multiple languages and includes those terms in your query. PATENTSCOPE also includes excellent analysis and refining tools to narrow search results. Information from the results can be shown as tables, graphs, or pie charts. For example, a pie chart could be produced showing the number of patents from each country.

Derwent Innovations Index provides in-depth indexing of patents from 40 issuing authorities for the years 2008 to the present. Nearly all scientific and technical areas are covered including chemistry, electrical technologies, electronics, engineering, and other applied technologies. The database can be used to discover the latest technological advances, monitor competitors' progress, formulate fresh ideas for research, or get an overview of inventions in the global marketplace.