For those interested in examining the legal aspects of this case, the decision to cancel these six trademarks is Blackhorse v. Pro-Football, Inc., Cancellation Number 92046185. The trademark was found to be in violation of 15 U.S.C. § 1052(a).
For those interested in researching trademark law generally, the following resources may be useful:
- Google also offers a search tool for U.S. patents.
- The World Intellectual Property Organization provides a database of international Patent Cooperation Treaty applications.
- HG.org maintains an introduction and guide to researching trademark law, along with links to relevant organizations and other resources.
- The International Trademark Association provides a number of resources organized by topic and country.