Patents by Inventor Chang H. Hong

Chang H. Hong 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).

  • Hydraulic hinge with door closing mechanism
    Patent number: 4358870
    Abstract: A hydraulic hinge, which can close automatically a door and firmly hold the door at a certain open position without any conventional door closer or door checking device, comprises a casing, a seat having a hexagonal opening therein, a buffer hydraulic mechanism and a spiral reversing spring installed in the casing, and a piston mounted on the buffer hydraulic mechanism and having a hexagonal piston stem extending through the spiral reversing spring to move reciprocatively within the hexagonal opening of the seat.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: November 16, 1982
    Inventor: Chang H. Hong