MICHEL, Circuit Judge.
Ecolochem, Inc. ("Ecolochem") filed suit in 1992, alleging that Southern California Edison Company ("Edison") infringed Ecolochem's U.S. Patent Nos. 4,556, 492 ("the '492 patent") and 4,818,411 ("the '411 patent") when deoxygenating water in the High-Flow Makeup Demineralizer ("HFMUD") at Edison's San Onofre Nuclear Generating Station ("SONGS"). Edison denied infringement, counterclaimed for declaratory judgment of invalidity, and asserted equitable...
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