Patents by Inventor Harri Heinze

Harri Heinze 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).

  • Overpressure valve for a hydraulic pit prop
    Patent number: 4167198
    Abstract: An overpressure valve for a hydraulic pit prop comprises a housing, a valve seat provided in the housing, a valve body movable in axial direction in the housing between a closed position engaging the valve seat and an open position, and bellows means filled with a gas under pressure arranged for biasing the valve body to the closed position.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: September 11, 1979
    Assignee: Salzgitter Maschinen Aktiengesellschaft
    Inventors: Heinrich Kotyza, Harri Heinze