|Access to patents|
Patents listed in any of the files that follow this introduction can be accessed in one of the following ways:
(1) Go to US Patent and Trademark Office, http://appft1.uspto.gov/netahtml/PTO/srchnum.html, and enter the (US) patent number to be retrieved. For patents issued before 1976 a TIFF viewer (such as AlternaTIFF, free download) is needed (then click on "Image" at the USPTO site that shows up).
(2) The German Patent and Trademark Office database is available at http://www.depatisnet.de. Enter the country code (e.g. US, or DE, or GB ...) as well as the patent number, then hit enter or click on "search" ("suchen")
(3) Another possibility to view patents from almost any country is offered at the European Patent Office, http://de.espacenet.com (or http://gb.espacenet.com ). Click on the red link to " weltweit - 30 Millionen Dokumenten" ("worldwide - 30 million documents") to get at the search form where you enter either a title, a keyword, a country code plus number, inventor, or year of invention etc. or any combination of those to limit your search.