Patents by Inventor Cheng-Yuan Chen

Cheng-Yuan Chen 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).

  • Patent number: 5040793
    Abstract: Plastic air-filled balls comprising three identical layer pieces of plastic connected together. In the middle layer, a thru-hold is provided to balance air pressure and on either one of the other layers an air valve and plug are disposed to confine air in said ball.
    Type: Grant
    Filed: July 25, 1990
    Date of Patent: August 20, 1991
    Assignee: Cheng Gen Plastic Co., Ltd.
    Inventor: Cheng-Yuan Chen