BIGGS, Chief Judge.
Kerotest Manufacturing Company, the plaintiff in the instant proceeding, sued C-O-Two Fire Equipment Company for a declaratory judgment to have two patents owned by C-O-Two, Re. 23,142 and 2,454,621, declared invalid. The suit at bar was commenced on March 9, 1950. Kerotest is a manufacturer of valves for use in portable carbon dioxide fire extinguishers. C-O-Two manufactures similar extinguishers.
On January 17, 1950, C-O-Two sued Acme...
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