Patents by Inventor Jon L. D. Sterkenburg

Jon L. D. Sterkenburg 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).

  • Liquid filter apparatus
    Patent number: 4093548
    Abstract: A piston assembly is disposed between the inlet zone and the filter medium of an apparatus to forcibly compact the filter medium with the same liquid which is being filtered by the liquid filter apparatus thereby to inhibit channeling of the liquid through the filter medium.
    Type: Grant
    Filed: May 10, 1976
    Date of Patent: June 6, 1978
    Assignee: Oil Refining Systems of Florida, Inc.
    Inventors: Jon L. D. Sterkenburg, George O. Kelbert