Patents by Inventor Lawrence E. Dewey

Lawrence E. Dewey 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).

  • Selectively controllable filtration system of a transmission and method thereof
    Patent number: 10337607
    Abstract: A hydraulic system of a transmission includes a controller, a pump, a fluid circuit fluidly coupled to the pump, a pressure regulator for regulating pressure in the fluid circuit, a cooler circuit fluidly coupled to the pressure regulator, a filter disposed in the fluid circuit downstream from the cooler circuit, and a bypass circuit disposed in the fluid circuit and fluidly coupled to the pressure regulator. The bypass circuit includes a valve movable between an open position and a closed position. In the open position, a first portion of fluid flowing from the pressure regulator flows through the bypass circuit and a second portion of the fluid flows through the cooler circuit and filter. In the closed position, the fluid flowing from the pressure regulator only flows through the cooler circuit and filter.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: July 2, 2019
    Assignee: ALLISON TRANSMISSION, INC.
    Inventors: Lawrence E. Dewey, Randall R. Kirk, Charles F. Long
  • SELECTIVELY CONTROLLABLE FILTRATION SYSTEM OF A TRANSMISSION AND METHOD THEREOF
    Publication number: 20170089456
    Abstract: A hydraulic system of a transmission includes a controller, a pump, a fluid circuit fluidly coupled to the pump, a pressure regulator for regulating pressure in the fluid circuit, a cooler circuit fluidly coupled to the pressure regulator, a filter disposed in the fluid circuit downstream from the cooler circuit, and a bypass circuit disposed in the fluid circuit and fluidly coupled to the pressure regulator. The bypass circuit includes a valve movable between an open position and a closed position. In the open position, a first portion of fluid flowing from the pressure regulator flows through the bypass circuit and a second portion of the fluid flows through the cooler circuit and filter. In the closed position, the fluid flowing from the pressure regulator only flows through the cooler circuit and filter.
    Type: Application
    Filed: September 29, 2015
    Publication date: March 30, 2017
    Inventors: Lawrence E. Dewey, Randall R. Kirk, Charles F. Long