Trademark Web,
provides a fee-based trademark checker with a free sample checker that
covers 200,000 records. Free registration required.
U.S. Patent and Trademark Office Patent
Databases, searchable database of front pages of U.S. patents from
1976, which includes the inventors name, patent title, asignee's name,
abstract, and a brief description of the patent's contents.
U.S. Patent Act, title
35 of the U.S. Code, the law governing patents.
U.S. Patent and Trademark Office, contains
a patent search engine in-depth information on the U.S. patent and trademark
process.
The VRN Patent Entry, comprehensive
set of links to patent sites including a hotlist, patent authority (organizations
and national patent offices), patent law, patent FAQ files, patent searching
and patent attorneys.