Patents by Inventor George K. Riffle

George K. Riffle 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).

  • Positive displacement fluid flowmeter
    Patent number: 4043198
    Abstract: A valving member is carried within the bore of a meter body having inlet and outlet ports. Chambers are formed within the bore on opposite sides of a piston slideably disposed about the valving member. In response to movement of the piston, valving member shifts axially within the bore to establish sequential periodic communication between alternate chambers and the inlet and outlet ports. After each shift, the valving member is latched by magnetic means.
    Type: Grant
    Filed: November 19, 1976
    Date of Patent: August 23, 1977
    Inventors: Logan W. Stillwell, George K. Riffle