Provides a search engine for the U.S. patent database, information about applying for patents, and explanation of the process.
Instructions for a systematic search for U.S. patents.
Free access to more than 90 million patent references worldwide, containing information about inventions and technical developments from 1836 to today.
This chemistry literature index contains strong coverage of patents in chemistry and chemical engineering.
Derwent Innovations Index provides access to more than 14,800,000 patents with links to cited and citing patents, cited articles, and full-text patent data sources.
An easy-to-use tool for searching and finding full text of patents.