Patents by Inventor Chao H. Yeh

Chao H. Yeh 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).

  • Stretching device for a pleated lampshade
    Patent number: 4994949
    Abstract: A stretching device for stretching a pleated lampshade, comprising an upper ring which inserts into the notches of the lampshade and a lower ring, both mounted on a threaded spindle, with the lower ring fixed or slidably retained and the upper ring slidably retained thereon. An adjusting nut is provided above the upper ring and a compression spring is received on the shaft between the two rings to bias the upper ring toward the adjusting nut.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: February 19, 1991
    Inventors: Chao H. Yeh, Chao K. Yeh