Patents by Inventor Walter F. Umholtz

Walter F. Umholtz 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).

  • D.C. Controlled adjustable ramp signal generator and method
    Patent number: 4438466
    Abstract: Circuit and method for providing a D.C. controlled adjustable ramp signal which maintains a predetermined ramping period for respectively adjusted optimum signal levels within the operating range. An example of a circuit of the invention is described for providing an automatically controlled bias or erase ramp signal in a magnetic recorder.
    Type: Grant
    Filed: April 2, 1982
    Date of Patent: March 20, 1984
    Assignee: Ampex Corporation
    Inventors: John S. Fawkes, Walter F. Umholtz