It is an excellent source for historical U.S. patents back to 1920. A fee based service for searching U.S., EPO, and PCT patents. A semi annual publication of NASA owned inventions. A fee based service from Derwent for searching U.S. and European patents. The full collection of patent information for sixty countries from the European Patent Office.
Most information included is bibliographic .
For some major countries the full text of the patent is available while other countries include the full image, too. They have copies of U.S. patents from 1790. The U.C. Law Library has additional information dealing with patents. Invention Disclosure forms are available online or in the U.C. Intellectual Property Office.