Patents by Inventor Ron A. Bjerke

Ron A. Bjerke 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).

  • Method for flushing a closed loop hydraulic system
    Patent number: 5493860
    Abstract: A method of flushing a closed loop hydraulic system utilizes a pair of adapters temporarily disposed between a drive motor and a pair of hoses during the flushing procedure. The adapters block communication between the hoses and the motor and cover the inlet/outlet ports of the motor. By connecting a case drain line to one of the adapters and running the engine to drive a charge pump, oil is circulated through the hose connected to that adapter, the case drain line, a case drain line filter and is returned to a tank. The case drain line is then switched to the other adapter so that oil from the charge pump is circulated through the other hose.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: February 27, 1996
    Assignee: Caterpillar Inc.
    Inventors: Ron A. Bjerke, D. Clark Hopkins, Maury G. Mannlein