U.S. patents, 1790 to present and published applications, 2001 to present. Patents prior to 1976 can be retrieved by number, date and classification. TIFF viewer required to view/print patent documents.
Patent Lens is a public patent database indexing 100 million patent documents from 90+ national and regional patent offices. Full-text EP, US and WO documents are available.
Free Patents Online provides fast, easy-to-use access to millions of patents and patent applications and an expanding data collection.
Access to chemistry patents and Chemical Abstracts [1907-present]. Use for: chemistry and chemical engineering, biochemistry, biotechnology, electrochemistry, metallurgy and materials science and pharmacology.
PatentScope (WIPO) searches 98 million patent documents including 4.1 million published international patent applications [PCT].