Patents by Inventor Douglas J. Lockhart

Douglas J. Lockhart 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).

  • Creep control for motor system
    Patent number: 7988593
    Abstract: The control system may have an electric motor and a traction device connected to an output of the motor. The control system may also have a decelerator and a controller. The controller may be in communication with the motor and the decelerator. The controller may be configured to determine a creep torque and apply the creep torque to the traction device when the decelerator is actuated.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: August 2, 2011
    Assignee: Caterpillar Inc.
    Inventors: Michael David Staub, William James Tate, Cameron T. Lane, Frederick Gaylord Beach, Douglas J. Lockhart
  • Creep control for motor system
    Publication number: 20090203496
    Abstract: A control system is disclosed. The control system may have an electric motor and a traction device connected to an output of the motor. The control system may also have a decelerator and a controller. The controller may be in communication with the motor and the decelerator. The controller may be configured to determine a creep torque and apply the creep torque to the traction device when the decelerator is actuated.
    Type: Application
    Filed: February 11, 2008
    Publication date: August 13, 2009
    Inventors: Michael David Staub, William James Tate, Cameron T. Lane, Frederick Gaylord Beach, Douglas J. Lockhart