Patents by Inventor Neal V. Sangree

Neal V. Sangree 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).

  • Digitally controlled pulse width modulated motor speed control for servo positioning systems
    Patent number: 4388570
    Abstract: A digitally controlled pulse width modulated control system for a servo device is disclosed wherein the control transistors (46, 48, 50, 52) can be operated directly from the incoming voltage source. The system converts the input or feedback signal into digital form that is applied to a downward counter arrangement (16, 18) which, after a pre-set period of time, allows logic circuitry (20) to selectively apply conduction pulses to the transistors (46, 48, 50, 52). Such selective conduction allows the transistors (46, 48, 50, 52) to regulate the direction of rotation of a motor (58) and the "width" or portion of the incoming waveform applied thereto via the transistors (46, 48, 50, 52).
    Type: Grant
    Filed: March 16, 1981
    Date of Patent: June 14, 1983
    Assignee: The Babcock & Wilcox Company
    Inventor: Neal V. Sangree