Patents by Inventor David C. Stringfellow

David C. Stringfellow 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).

  • Electronic line shaft
    Patent number: 7417386
    Abstract: A method and assembly for synchronizing machine operations, the assembly comprising a reference generator for generating a speed reference signal and a position reference signal, a plurality of slave units, each slave unit including, a mechanical device, a separate motor linked to and driving the mechanical device and a separate unit controller for controlling the unit motor, the unit controller receiving and using the reference signals to control motor operation and a synchronizer receiving the reference signals from the control signal source and simultaneously providing the reference signals to each of the slave unit controllers for use in controlling operation of the motors in a synchronized fashion.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: August 26, 2008
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Richard W. Piefer, Thomas J. Rehm, Kevin L. Baumann, Christopher W. Como, John D. Davis, David C. Stringfellow