Patents by Inventor Otto Eigner

Otto Eigner 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).

  • Monitoring circuit for a door operating D.C. electric motor
    Patent number: 4675586
    Abstract: A monitoring circuit for a door operating D.C. electric motor, the circuit comprises a first means for detecting a back EMF of the motor and producing a load signal indicative of the magnitude of the back EMF, a second means for detecting the time rate of change of the load signal and issuing an obstruction signal if the magnitude of the time rate of change of the load signal exceeds a predetermined value.
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: June 23, 1987
    Assignee: Byrne & Davidson Industries Limited
    Inventors: Otto Eigner, Richard E. Jones