Patents by Inventor Stephen Tsz-sek Lee

Stephen Tsz-sek Lee 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).

  • Dimmable electronic ballast
    Patent number: 6545431
    Abstract: This invention relates to dimmable electronic ballasts for particular use with fluorescent lamps.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: April 8, 2003
    Assignee: City University of Hong Kong
    Inventors: Ron Shu-yuen Hui, Henry Shu-hung Chung, Eric Ho, Stephen Tsz-sek Lee
  • Dimmable electronic ballast
    Publication number: 20020033679
    Abstract: This invention relates to dimmable electronic ballasts for particular use with fluorescent lamps.
    Type: Application
    Filed: June 15, 2001
    Publication date: March 21, 2002
    Inventors: Ron Shu-Yuen Hui, Henry Shu-hung Chung, Eric Ho, Stephen Tsz-sek Lee