Patents by Inventor Hwang Biing-Yih

Hwang Biing-Yih 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).

  • Joining structures for metal pipes
    Patent number: 4930816
    Abstract: A joining structure for metal pipes to be applied in each passage hole of a pipe fitting. This structure can save time in pipe fitting work, and can reinforce the mutual joined condition of a pipe and a pipe fitting.
    Type: Grant
    Filed: May 17, 1989
    Date of Patent: June 5, 1990
    Inventor: Hwang Biing-Yih