Patents by Inventor Shian-Fun Tsai

Shian-Fun Tsai 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).

  • AC/DC automatic changeover and automatic charge device
    Patent number: 4939432
    Abstract: The AC/DC changeover device automatically changes from AC to DC current by setting a TRIAC on or off, to supply DC from a battery in the absence of AC, for powering an air pump for an aquarium.
    Type: Grant
    Filed: June 14, 1988
    Date of Patent: July 3, 1990
    Inventor: Shian-Fun Tsai
  • Aquarium pump
    Patent number: D294359
    Type: Grant
    Filed: October 10, 1986
    Date of Patent: February 23, 1988
    Inventor: Shian-Fun Tsai