Patents by Inventor Lester J. Hoffman

Lester J. Hoffman 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 control chopper apparatus phase angle limiting
    Patent number: 4516059
    Abstract: A programmed microprocessor motor control apparatus is provided for a vehicle propulsion motor that is responsive to an input control device to determine the acceleration rate and a predetermined motor voltage curve of the propulsion motor.
    Type: Grant
    Filed: May 19, 1981
    Date of Patent: May 7, 1985
    Assignee: Westinghouse Electric Corp.
    Inventors: Richard D. Roberts, James H. Franz, Jr., Lester J. Hoffman, Lalan G. Miller
  • Vehicle propulsion control apparatus and method
    Patent number: 4392091
    Abstract: The propulsion control apparatus for a vehicle including a plurality of motor driven wheel units detects a slip or slide operation of at least one wheel unit in accordance with a predetermined difference between sensed motor currents, and reduces the tractive effort of those wheel units until the sensed motor currents no longer have that difference.
    Type: Grant
    Filed: September 2, 1981
    Date of Patent: July 5, 1983
    Assignee: Westinghouse Electric Corp.
    Inventors: Richard D. Roberts, Lester J. Hoffman