Community of Science - U.S. Patents A fully searchable bibliographic database containing all U.S. patents issued since 1975. http://www.patents.cos.com/
Information Specialties Corporation Provider of patent/trademark copies and file (wrapper) histories. http://www.informationspecialties.com/
Patent Cafe Intellectual property resource for inventors, patent attorneys, and the general public. http://www.patentcafe.com/