RULING AND ORDER
CHATIGNY, District Judge.
In 1989, defendant Pacific Diesel Brake Co. was issued U.S. Letter Patent No. 4,848,289 ("the '289 patent") for a method and apparatus for retarding engines. In 1993, plaintiff Jacobs Vehicle Systems, Inc. ("Jacobs") sued Pacific Diesel Brake Co. and its assignees (collectively "Pacbrake") for a declaratory judgment of noninfringement and invalidity of the '289 patent. Pacbrake filed a counterclaim asserting...
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