Tokyo Seimitsu rejects patent claim, files antitrust counterclaim against KLA-Tencor

September 27, 2001 – Oakland, CA – Today, Tokyo Seimitsu Co., Ltd. has filed its answer in response to KLA-Tencor’s patent infringement suit. The answer denies all charges of patent infringement and alleges KLA’s U S Patent No. 4,805,123 is invalid and unenforceable.

The answer also alleges several counterclaims against San Jose based KLA-Tencor. Tokyo Seimitsu charges KLA-Tencor with deceptive conduct before the United States Patent and Trademark Office and violations of U.S. Antitrust Law.

Tokyo Seimitsu manufactures the Win-Win 50, a super performance wafer inspection system using bright field optical technology.

KLA-Tencor, CA, filed a patent infringement suit in July against Tokyo Seimitsu Co. Ltd. and TSK America Inc. The suit alleged that these parties are infringing on a KLA-Tencor’s U S Patent No. 4,805,123, directed to automatic photomask and reticle inspection methods and equipment.

The suit also alleges that these parties have actively induced the use of the patent process by others outside the US for products that are then imported into the US. The suit seeks both damages for the alleged patent infringement and an injunction against any future infringing activity.


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