Patents by Inventor Eric A. Kolm

Eric A. Kolm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Acoustical switch
    Patent number: 3970987
    Abstract: An acoustical switch is actuated from a remote location by a sound generator such as an ultrasonic whistle. The switch includes a special tuned signal receiver coupled with an amplifier having a frequency selective feedback network. The output of the amplifier is an a.c. signal which is applied to a bistable circuit which, in one state, energizes a relay to turn on an appliance connected to the switch and, in its other state, turns the appliance off.
    Type: Grant
    Filed: May 31, 1974
    Date of Patent: July 20, 1976
    Assignee: Signal Science, Inc.
    Inventor: Eric A. Kolm