Patents by Inventor Tan Yuen Hung

Tan Yuen Hung 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).

  • Light sensitive dimmer switch circuit
    Patent number: 6114813
    Abstract: A light sensitive dimmer switch circuit for controlling the illumination level of a light as a function of the ambient illumination level surrounding the dimmer switch circuit by selectively controlling an AC power signal provided to the light includes a photocell and a phase control circuit. The photocell is responsive to the ambient illumination level and has a conduction state associated therewith. The conduction state changes, in response to the ambient illumination level, such that the photocell effectively exhibits either a substantially open circuit or a substantially short circuit. The phase control circuit selectively varies a conduction phase angle associated with the AC power signal which correspondingly causes a variation in the illumination level of the light.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: September 5, 2000
    Assignee: Holmes Products Corp.
    Inventors: David Lo, Tan Yuen Hung
  • Light sensitive dimmer switch circuit
    Patent number: 5789869
    Abstract: A light sensitive dimmer switch circuit for controlling the illumination level of a light as a function of the ambient illumination level surrounding the dimmer switch circuit by selectively controlling an AC power signal provided to the light includes a photocell and a phase control circuit. The photocell is responsive to the ambient illumination level and has a conduction state associated therewith. The conduction state changes, in response to the ambient illumination level, such that the photocell effectively exhibits either a substantially open circuit or a substantially short circuit. The phase control circuit selectively varies a conduction phase angle associated with the AC power signal which correspondingly causes a variation in the illumination level of the light.
    Type: Grant
    Filed: September 17, 1996
    Date of Patent: August 4, 1998
    Assignee: Holmes Products Corporation
    Inventors: David Lo, Tan Yuen Hung