Patents by Inventor Lubomir Vondra

Lubomir Vondra 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).

  • Self-pumping pump shaft seal
    Patent number: 4606712
    Abstract: A positive displacement pump is provided with an impeller drive shaft seal assembly to prevent material in the pumping chamber from reaching an adjacent drive shaft chamber. The seal assembly comprises a rotary seal member mounted on the impeller having an outer surface spaced a non-uniform distance from the inner surface of a member defining the drive shaft chamber so that when the drive shaft is rotated the changing distance between the inner and outer surfaces causes a pumping action to occur so that material is continually pumped around the seal assembly.
    Type: Grant
    Filed: November 14, 1984
    Date of Patent: August 19, 1986
    Assignee: Abex Corporation
    Inventor: Lubomir Vondra