At the end of trial, the Defendant, Texas Instruments Incorporated’s (“TI”), pursued its equitable defense of laches, the only remaining issue left in this patent infringement case. The district court conduced an evidentiary hearing on laches at which the district court heard the live testimony of five witnesses and also accepted deposition designations, prior trial testimony, and exhibits to consider separate from the live testimony.
As explained by the district court, “[t]he equitable defense of laches may be available where the plaintiff unreasonably delayed filing its infringement suit. See A.C. Aukerman Co. v. R.L. ChaidesConstr. Co., 960 F.2d 1020, 1032 (Fed. Cir. 1992) (en banc). The defense is applicable where the accused infringer proves two things: (1) ‘the plaintiff delayed filing suit for an unreasonable and inexcusable length of time from the time the plaintiff knew or reasonably should have known of its claim against the defendant,’ and (2) the defendant suffered material prejudice as a result of the delay Id. at 1032. The defendant must prove delay and prejudice by a preponderance of the evidence. Id. at 1045.”
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