Patents by Inventor Daniel J. Harken

Daniel J. Harken 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).

  • Front wheel drive clutch control system
    Patent number: 4951775
    Abstract: A clutch control system for the front wheel drive clutch of a four-wheel drive vehicle engages the front wheel drive clutch as a function of three brake-operated switches, a pair of manually-operated "OFF-ON-AUTO" mode switches and a pair of speed responsive switches connected between a battery and the solenoid of a front wheel drive clutch control valve. The system engages the clutch when vehicle speed is above a limit speed and both service brakes are applied even when the mode switches are in their "OFF" position wherein the clutch is normally disengaged.
    Type: Grant
    Filed: July 3, 1989
    Date of Patent: August 28, 1990
    Assignee: Deere & Company
    Inventors: Carl E. Kittle, Daniel J. Harken, Seaton Moon