OAKES, Circuit Judge:
This appeal involves the validity of patents on an autoclaving device (No. 3,423,805) and a method of autoclaving concrete blocks (No. 3,275,724). An autoclave, for those uninitiated in the art, is a "strong metallic vessel, gas-tight when closed, used for heating liquids under pressure." Webster's New International Dictionary 156 (1929).
The patents in question initially were issued, effective June 1960, to John B. Klingel, who later...
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