July 31, 2006

International notes U.S. district court declares Calgon Carbon patent invalid

PITTSBURGH, PA-The U.S. district court for the district of New Jersey has ruled that Calgon Carbon's patent for the use of ultraviolet (UV) light to prevent infection from Cryptosporidium in drinking water is invalid. The company has indicated that it will appeal the ruling. A similar ruling was handed down in June 2005 by the Federal Court of Canada, which characterized Calgon Carbon's process for inactivation of Cryptosporidium in drinking water using UV light as a discovery rather than an invention. The company's subsequent appeal of that decision was allowed by the Federal Court of Appeal last December. As a result, Calgon Carbon is continuing its patent infringement litigation, in which it claims that the city of North Bay, Ontario infinged the company's patent on the process and that Trojan Technologies induced that infringement. The case is still pending.

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