Patents by Inventor Donald John Waldman

Donald John Waldman 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).

  • Direct operated check injector
    Patent number: 5845852
    Abstract: A fuel injector includes an injector body and a three-way control valve having a valve element movable between first and second positions in the injector body. A check is disposed in the injector body and is movable to inject fuel when the control valve is in the second position and to block fuel injection when the control valve is in the first position. An actuator is selectively operable to move the valve element between the first and second positions. The injector includes a single clearance fit located in the control valve wherein the clearance fit is not exposed to a substantial pressure differential when the control valve is in the first position.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: December 8, 1998
    Assignee: Caterpillar Inc.
    Inventors: Donald John Waldman, Keith Edward Lawrence, Steven James Funke, Craig William Lohmann