Patents by Inventor Powell Tsai

Powell 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).

  • Wall controller
    Patent number: 5338910
    Abstract: A wall controller for controlling the speed of rotation of a ceiling fan and the intensity of light of a lighting fixture, which includes a junction box covered with a slotted mounting plate to hold a control circuit assembly, a cover plate connected to the mounting plate to hold a switch control slide assembly therebetween, the control circuit assembly is consisted of two switches moved by two control slides of the switch control slide assembly to control the operation of the lighting fixture and the ceiling fan respectively.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: August 16, 1994
    Inventor: Powell Tsai
  • Double-pole, wall mounted voltage regulator
    Patent number: D329635
    Type: Grant
    Filed: September 11, 1990
    Date of Patent: September 22, 1992
    Inventor: Powell Tsai