Patents by Inventor Shyh-Chyi Hwang

Shyh-Chyi Hwang 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).

  • Therapeutic suction device
    Patent number: 4795428
    Abstract: A therapeutic suction device includes an operating vacuum chamber connected to a motor operated pump to create a vacuum pressure therein and a pressure controlling means to maintain a predetermined pressure in the vacuum chamber. The vacuum pressure in the operating vacuum chamber can be pre-arranged so as to provide a suction force by a pressure difference even when there is a shortage of electricity.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: January 3, 1989
    Inventor: Shyh-Chyi Hwang