Patents by Inventor William Michael Walter

William Michael Walter 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).

  • Hydrostatic auxiliary drive system
    Patent number: 6644429
    Abstract: A dual path hydrostatic drive system having an electronic auxiliary drive auxiliary drive controller controlling the hydraulic output of left and right variable displacement pumps in response to the speed of the main drive wheels and a speed ratio signal from a speed ratio input control. In addition, the auxiliary drive auxiliary drive controller controls the outputs of the pumps within three basic boundary conditions; a hydraulic pressure boundary condition, a motor speed boundary condition and a power boundary condition. A clutch mode activation switch has two positions for signaling the auxiliary drive auxiliary drive controller to operate in a first mode in which the auxiliary drive system is shut down upon activation of the main clutch or a second mode where the auxiliary drive controller attempts to mirror the operation of the main drive wheels.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: November 11, 2003
    Assignee: Deere & Company
    Inventors: Gladys L. Evans, Judson P. Clark, Glenn Owen Scheer, William Michael Walter, William Daniel Robinson, David William Stubben, Alfred Sigmund Smemo
  • Hydrostatic auxiliary drive system
    Publication number: 20020100630
    Abstract: A dual path hydrostatic drive system having an electronic auxiliary drive auxiliary drive controller controlling the hydraulic output of left and right variable displacement pumps in response to the speed of the main drive wheels and a speed ratio signal from a speed ratio input control. In addition, the auxiliary drive auxiliary drive controller controls the outputs of the pumps within three basic boundary conditions; a hydraulic pressure boundary condition, a motor speed boundary condition and a power boundary condition. A clutch mode activation switch has two positions for signaling the auxiliary drive auxiliary drive controller to operate in a first mode in which the auxiliary drive system is shut down upon activation of the main clutch or a second mode where the auxiliary drive controller attempts to mirror the operation of the main drive wheels.
    Type: Application
    Filed: January 28, 2001
    Publication date: August 1, 2002
    Inventors: Gladys L. Evans, Judson P. Clark, Glenn Owen Scheer, William Michael Walter, William Daniel Robinson, David William Stubben