Patents by Inventor Jeng-Yih Yang

Jeng-Yih Yang 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).

  • Manhole cover
    Patent number: 5362174
    Abstract: A manhole cover comprises a base and a cover. The base has a first inner rim provided with a first bevel while the cover has a second outer rim provided with a second bevel. When the base is joined with the cover, the first bevel of the base and the second bevel of the cover are caused to make contact with each other such that the base is joined with the cover in an airtight and watertight manner. The first bevel of the base and the second bevel of the cover are of such construction that they enable the cover to be lifted easily to set apart from the base.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: November 8, 1994
    Inventor: Jeng-Yih Yang