Means-plus-function claim must recite some structure, “known equipment” not enough

In a decision today, the Federal Circuit affirmed a district court's finding of invalidity of a several claims of a patent for indefiniteness under 35 U.S.C. § 112, ¶ 2. The patent specification did not describe a corresponding structure for the claim limitation "control means" as required by 35 U.S.C. § 112, ¶ 6, but […]