Patents by Inventor Thomas W. Holmes

Thomas W. Holmes 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).

  • Noise suppression in PWM-driven DC motor
    Patent number: 5857060
    Abstract: A system for reducing Radio Frequency Interference (RFI) produced by motors which are powered by Pulse Width Modulation (PWM). It is believed that the PWM induces radiation at the PWM frequency and harmonics. The invention shields power cables which carry the PWM pulsed current, and provides capacitive shunting of one of the cables to ground.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: January 5, 1999
    Assignee: ITT Automotive Electrical Systems, Inc.
    Inventors: James Elliott, Mohamed Abbas, John R. Suriano, Thomas W. Holmes
  • Noise suppression in PWM-driven DC motor
    Patent number: 5838877
    Abstract: A system for reducing Radio Frequency Interference (RFI) produced by motors which are powered by Pulse Width Modulation (PWM). It is believed that the PWM induces radiation at the PWM frequency and harmonics. The invention shields power cables which carry the PWM pulsed current, and provides capacitive shunting of one of the cables to ground.
    Type: Grant
    Filed: August 2, 1995
    Date of Patent: November 17, 1998
    Assignee: ITT Automotive Electrical Systems, Inc.
    Inventors: James Elliot, Mohamed Abbas, John R. Suriano, Thomas W. Holmes
  • Dual motor wiper control
    Patent number: 5252897
    Abstract: A motor vehicle glass wiper system includes first and second motor assemblies and respective first and second wiper blades. Each motor assembly is effective to move its respective wiper blade through a wipe pattern that is bounded by an outboard direction reversing position and an inboard direction reversing position. The wipe patterns of the first and second wiper blades overlap to establish an interference zone of potential wiper blade contact which is adjacent both inboard direction reversing positions and bounded thereby. A wiper motor control monitors a respective key position sensor for each wiper blade. The control energizes each one of the wiper motors to move its respective wiper blade to the inboard direction reversing position and back to the outboard direction reversing position each time the key position sensor of the other one of the wiper blades indicates a transition out of the interference zone thereby inhibiting interference between the wiper blades.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: October 12, 1993
    Assignee: General Motors Corporation
    Inventors: Eugene B. Porter, Thomas W. Holmes