Patents by Inventor David S. Ohaver

David S. Ohaver 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).

  • Control system to apply vehicle brakes during a transmission directional shift
    Patent number: 4248330
    Abstract: A hydraulic control system for a multi-directional multi-speed transmission for the power train of a vehicle includes means responsive to the directional shift of the transmission at a predetermined minimum speed to automatically apply the brakes of the vehicle during a shifting period.
    Type: Grant
    Filed: May 18, 1977
    Date of Patent: February 3, 1981
    Assignee: Caterpillar Tractor Co.
    Inventors: Sidney J. Audiffred, Jr., David S. Ohaver
  • Modulation control valve for hydraulically operated winch
    Patent number: 3991787
    Abstract: A hydraulically operated winch of the type adapted for logging or towing operations and having a rotatable winch drum about which a cable or line is entrained, a normally disengaged clutch being hydraulically operable to provide a coupling between a power input member and a winch drum drive shaft, a normally engaged friction brake normally securing the winch drum drive shaft against rotation while being hydraulically disengagable and a normally engaged clutch providing a selective coupling between the winch drum drive shaft and the winch drum.
    Type: Grant
    Filed: July 15, 1974
    Date of Patent: November 16, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: James L. Schmitt, David S. Ohaver