Aerovox Corp. v. Cornell-Dubilier Corp.

L. HAND, Circuit Judge.

Claims six, seven and eight were in the original patent; nine, ten, eleven and fourteen were added by reissue; all are for a process of making an electrolytic condenser. The plaintiff’s processes, which are said to infringe these claims, are four in number, and the first three are precisely the same as to the mix for the electrolyte, which is about 43%. ethylene glycol, 47%% boric acid, and 9%% aqua ammonia (26% C. P.). The plaintiff heats this under atmospheric pressure until it becomes a clear solution at between 230° and 240° F. It then immerses the rolled condenser…