Patents by Inventor Kurt Gruensfelder

Kurt Gruensfelder 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).

  • Motor controller
    Patent number: 5227711
    Abstract: A motor controller accepts ac voltage at any frequency within a wide range and automatically generates an alternating polarity load-voltage having a preselected frequency, regardless of the frequency of the input voltage. The motor controller includes a dc-ac inverter which operates under the control of an EPROM to automatically generate the alternating polarity load-voltage at the desired frequency.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: July 13, 1993
    Assignee: Airtacs Corporation
    Inventor: Kurt Gruensfelder