Search the full text of patents 1976 - present; patents issued 1790 - 1975 are searchable by patent number or issue date. The Patent Application Database contains all patent applications published since 2001.
A free patent search tool, including 80 million patent documents from the European Patent Office, the USPTO, and other countries worldwide, searchable by full text.
A patent search database including records from patent offices worldwide. It also allows searching of gene sequences.