Patents by Inventor Walter Fishman

Walter Fishman 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).

  • Patent number: 4374351
    Abstract: A means to change the position of a drive unit in accordance with desired changes periodically provided as a digital value and entered in a first register, which is then decremented to zero by counting actual increments of drive unit change. Power to change the drive unit is proportional to the residual value in this register, with no power when actual change has equalled desired change. The count of actual change increments is determined from clock pulses updating a second register representing position whenever the analog equivalent of this register differs from an analog signal representing actual position.
    Type: Grant
    Filed: December 9, 1980
    Date of Patent: February 15, 1983
    Assignee: Leeds & Northrup Company
    Inventors: Walter Fishman, Theron W. Jenkins, Jr.