Patents by Inventor Jae Y. Yoo

Jae Y. Yoo 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 door closer
    Patent number: 4847946
    Abstract: A new type of hydraulic door closer is disclosed. The device of the present invention utilizes spring force and hydraulic pressure, and is equipped with a straightly extending arm instead of the conventional type of the folding arms. The advantages of the device of the present invention are that variations of the size of the device are not required for different sizes and weights of doors, and the lack of the folding portion of the arm enables avoiding of wear and stress on the critical parts. Another advantage of the device of the present invention is that different door opening ranges are provided such as 80 degrees, 90 degrees and 100 degrees in addition to a free moving zone.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: July 18, 1989
    Assignee: Sam Kyong Hardware Co., Ltd.
    Inventors: Sun O. Nam, Wan S. Lee, Jae Y. Yoo