WWW Trademark Searching
The United States Patent and Trademark Office (USPTO) has in recent years made some of their resources available over the World Wide Web. The USPTO now offers free WWW searching for trademarks. The USPTO trademark database is called TESS (Trademark Electronic Search System). Please see the USPTO website for exact coverage.
Resources available at the USPTO website:
For a complete list of services offered by the office, please see the USPTO's website.