Patents by Inventor Sandor Hlavay

Sandor Hlavay 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).

  • Pressure limiting valve, particularly for hydraulic mine props
    Patent number: 4418715
    Abstract: The invention relates to a pressure limiting valve, mainly for hydraulic mine props, which has a working space with an inlet opening connected to a high-pressure space and an outlet opening connected to low-pressure space in the operative position of the valve, a displaceable first valve member engageable with a valve seat within this working space in the shut-off position of the valve, a spring pressing the first valve member to the valve seat and in a given case, a spring sustaining the valve seat, suitably a gas spring and in which according to the invention the first valve member has transfer passages ensuring communication between the inlet opening and the outlet opening in the open position of the valve, as well as second valve member provided with a frustoconical head facing the cover plate and having a stem loosely fitted in a guide bore formed in the first valve member which is formed with an annular axial flange surrounding the head of the second valve member which is concentrically arranged within
    Type: Grant
    Filed: August 12, 1981
    Date of Patent: December 6, 1983
    Assignees: Kozponti Banyaszati Fejlesztesi Intezet, Magyar Aluminiumipari Troszt, Skotchinsky Institut Gornogo Dela
    Inventors: Karoly Balazs, Vladislav D. Firstov, Miklos Frcska, Laszlo Gal, Sandor Hlavay, Lajos Huber, Jozsef Korbuly, Laszlo Mahig, Juri F. Ponomarenko, Juri G. Shein, Ferenc Simon