Patents by Inventor Thomas M. Stankey

Thomas M. Stankey 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).

  • Circuit for driving a stepper motor and method of controlling a stepper motor driver
    Patent number: 6903531
    Abstract: A driver circuit is provided for a stepper motor which utilizes a processor that outputs a PWM signal. The driver circuit includes an H-bridge circuit having first and second inputs, and a switching circuit having an input and an output. The first H-bridge input and the switching input connect to the PWM signal output from the processor, and the switching output connects to the second H-bridge input. The switching circuit performs an inversion of a duty cycle of the PWM signal when the PWM signal is present, and a non-inversion of the duty cycle when the PWM signal is not present.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: June 7, 2005
    Assignee: Electronic Theatre Controls, Inc.
    Inventors: Eric W. Suomi, Thomas M. Stankey