Patents by Inventor Joseph R. Degenfelder

Joseph R. Degenfelder 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).

  • Proportional electromagnetic flow valve
    Patent number: 5020772
    Abstract: A remotely controllable proportional pilot flow valve includes a common steel armature with a concave attracted end which is magnetically semi-saturated in the design range of energization, providing a flat force response curve. The armature has a recessed midsection to improve tolerance to particulate contamination in the working fluid and two opposed flats for improved venting.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: June 4, 1991
    Inventors: Joseph R. Degenfelder, James F. Sikorski