Duplex Electric Co. v. Padua Holdup Alarm Corp.

(after stating the facts as above). Tho appellant contends that, if claim 6 of the patent in suit is to be interpreted broadly enough to eover the device alleged to infringe, then the claim is invalid, in view of the prior art. Use of a single push button operated by foot pressure to set off a burglar alarm was old in the art, as illustrated in patent No. 848,016, to Donnenworth and patent No. 1,093,801 to Phelps; closing multiple circuits by depression of a ba.r is shown in McCarthy, No. 300,098; while tho patent to Edwards, No. 808,147, for bowling alley foul line, discloses the idea of…