Kemp v. Detroit Heating & Lighting Co.

Complainant below, appellee here, instituted this suit, charging an infringement of letters patent No. 577,739, granted February 23, 1897, for a device for regulating the quality of gas. The defendant below, appellant here, denied the infringement, and claimed that the letters patent No. 803,490, which had been granted to him and Charles E. Kemp, on the 31st day of October, 1905, were for a device radically different from anything lawfully described and claimed in the letters patent of complainant.

The case was duly matured for hearing, and submitted with the proofs and argument of counsel, on…