Patents by Inventor John Pierce, III

John Pierce, III 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).

  • Variable tail pipe valve system
    Patent number: 10280824
    Abstract: An exhaust system includes a particulate filter, a variable valve, and a controller communicatively connected to the variable valve. The controller is operative to determine a backpressure caused by the particulate filter in the exhaust system, and control a position of the variable valve as a function of the backpressure caused by the particulate filter.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: May 7, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Glenn Pietila, John Pierce, III, Gerald J. Clark
  • VARIABLE TAIL PIPE VALVE SYSTEM
    Publication number: 20180258825
    Abstract: An exhaust system includes a particulate filter, a variable valve, and a controller communicatively connected to the variable valve. The controller is operative to determine a backpressure caused by the particulate filter in the exhaust system, and control a position of the variable valve as a function of the backpressure caused by the particulate filter.
    Type: Application
    Filed: March 8, 2017
    Publication date: September 13, 2018
    Inventors: Glenn Pietila, John Pierce, III, Gerald J. Clark