Computer Science: Patents

Kelley Center for Government Information
Provides free and effective public access to government information, including patents and trademarks

U. S. Patent & Trademark Office
Provides information on patents, trademarks, and intellectual property law & policy.

Google Patents
Provides information on over 7 million U. S. patents.

pat2pdf
Provides a free PDF of a U. S. patent or patent application if you know the patent or application number.

esp@cenet
Provides information on European patents.