US
Patent and Trademark Office (USPTO) Patent Databases - bibliographic
content searching on U.S. patents since 1976, including full-page images.
Requires a browser plug-in to view TIFF images of full patents. Links to
free plug-ins provided;
AlternaTIFF plug-in recommended for PCs.
IBM
Intellectual Property Network - search the full text of U.S. patents
since 1971 and European patents since 1980, and search for abstracts of
Japanese patent applications since 1976. Full-page images can be viewed
on-screen, and printable copies can be ordered for a fee.
European
Patent Office - search for European (EU) patents, and display full-text
when available.