Searchable, full-text database from January 1, 1976 onward (full-page images since 1790). To view and print patents in PDF for free, a viewer software needs to be installed. It is available from http://www.uspto.gov/web/menu/plugins/index.html. Select TIFF - Tagged Image File Format (used for Patent images) - click on Free and following instruction. Once downloaded, you can view patents in PDF by clicking on Images when viewing a patent. Patents can only be printed one page at a time with the free plugin software.