Barber-Coleman Co. v. A. G. Redmond Co.

SIMONS, Circuit Judge.

The patent involved in the present infringement suit is No. 1,822,679, to *718Stewart and Lilja, granted September 8, 1931. It relates to an induction motor of fractional horse power of the shading ring core type for use with alternating current. Infringement not being denied, validity is the sole issue. The court below found the patent anticipated and dismissed the bill.

The claims cover a combination of elements in the electrical art, wherein control of force is as often, explained by theory subject to controversy as upon principles universally accepted. The difficulty of…