Randall Control & Hydrometric Corp. v. Elevator Supplies Co.

The Randall Control & Hydrometrie Corporation appeals from an order enjoining it from infringing on claims 14, 15, 20, 21, and 22 of letters patent No. 1,160,315, issued to Emerson R. Newell in November, 1915. The Elevator Supplies Company, appellee, owns the patent, the validity of which is not involved.

Newell’s invention relates to an elevator signaling apparatus, in which a signal or signaling means is provided, adapted to give a signal either to the operator of the ear or an intending passenger, and “to restore the same and the circuits which operate such signaling means to normal condition, and which shall'be controlled (preferably at the several floors) by the operator of the car, preferably through operation of the gate mechanism,” the object being to provide a construction which shall be simpler and less expensive to install than mechanisms heretofore used.

The claims involved are as follows:

Claim 20 is as follows:

In elevator signaling it became desirable to provide for sending a signal to each of a plurality of elevators, and for so canceling the signals that, if the operator of one elevator did not wish to stop to answer the signal, the signal could still be left…