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Resources for Patent Searches
U.S. Patents and Trademarks
University of Idaho Library - Government Documents website about searching for US Patents and Trademarks.
Derwent Innovations Index
Covering over 14.3 million basic inventions from 40 worldwide patent-issuing authorities, this database facilitates rapid, precise patent searching, letting you conduct patent and citation searches of inventions in chemical, electrical, electronic, and mechanical engineering
Search by patent number, inventor, assignee, keywords, class numbers, patent citations, CAS Registry numbers, etc.
European Patent Office
Search over 80 million patents.
Searches 37 million patent documents including 2.5 million published international patent applications (PCT)