Patents by Inventor Russel B. Leibfreid

Russel B. Leibfreid 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).

  • Variable venturi carburetor
    Patent number: 4229385
    Abstract: A variable venturi carburetor is disclosed which has side walls that simultaneously are moved toward and away from one another to increase the size of the throat of the venturi as the engine speed increases and decrease the size of the throat as the engine speed decreases to provide a desirable constant air-to-fuel ratio to the engine over a range of engine speeds.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: October 21, 1980
    Inventor: Russel B. Leibfreid