PatFT and AppFT are two separate databases. Search the PatFT see if a patent has already been filed or granted. Search for Full-Text and Image versions of patent applications. The USPTO houses full text for patents issued from 1976 to the present and PDF images for all patents from 1790 to the present.
EPO and USPTO launched the Cooperative Patent Classification System. The CPC is the result of a partnership between the EPO and the USPTO in their joint effort to develop a common, internationally compatible classification system for technical documents, in particular patent publications, which will be used by both offices in the patent granting process
Value-added patent information from Derwent World Patent Index as well as patent citation information from Patents Citation Index. Chemical, electrical, electronic, and mechanical engineering Patent coverage to 1963; citations to 1973.