Patents by Inventor David Willard Howell

David Willard Howell 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).

  • Trailer connection selector
    Patent number: 8123306
    Abstract: A truck includes a pressurized air supply system for providing air to one of a plurality of air supply connections and a selector circuit for providing selection to one of the air supply connections. The circuit includes a first inversion valve with supply from a selector valve and control from a parking brake valve, a second inversion valve with supply from the parking brake valve and delivery to a first air supply connection, a synchro valve with supply from the parking brake valve and delivery to a second air supply connection, a double check valve with supply from the first inversion valve and the synchro valve and delivery to a control line of the second inversion valve and the synchro valve, a first trailer supply connection to the delivery line of the second inversion valve, and a second trailer supply connection to the delivery line of the synchro valve.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: February 28, 2012
    Assignees: Volvo Group North America, LLC, Bendix Commercial Vehicle Systems LLC
    Inventors: Keith Alan Hurlburt, David Willard Howell
  • Trailer connection selector
    Publication number: 20100078278
    Abstract: A truck includes a pressurized air supply system for providing air to one of a plurality of air supply connections and a selector circuit for providing selection to one of the air supply connections. The circuit includes a first inversion valve with supply from a selector valve and control from a parking brake valve, a second inversion valve with supply from the parking brake valve and delivery to a first air supply connection, a synchro valve with supply from the parking brake valve and delivery to a second air supply connection, a double check valve with supply from the first inversion valve and the synchro valve and delivery to a control line of the second inversion valve and the synchro valve, a first trailer supply connection to the delivery line of the second inversion valve, and a second trailer supply connection to the delivery line of the synchro valve.
    Type: Application
    Filed: September 30, 2008
    Publication date: April 1, 2010
    Inventors: Keith Alan Hurlburt, David Willard Howell