DOOLING, District Judge.
Plaintiff Scharmer devised and in 1959 was granted a patent (No. 2,886,124) on a hood for kitchen ranges that had installed inside it a grease filter, deodorizer, suction unit and ductwork so arranged that the stovetop gases could be sucked in, purged of grease and odors and then recirculated to the kitchen through the louvred front of the hood, all without any connection to the outdoors. In external appearance Scharmer's hood looked like...
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