Patents by Inventor Cheong Bon Han

Cheong Bon Han 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).

  • Ballast method and apparatus and coupling therefor
    Patent number: 6031338
    Abstract: A ballast is disclosed which can operate at an effective level of output with a number of different input voltage levels. A ballast is also disclosed that uses a ceramic as a heat sink for switching transistors. A ballast is further disclosed which uses a start signal for a power factor circuit to boost voltage after the load for the ballast has already had a current applied to it. Furthermore, a ballast is disclosed which has a transformer having a permeability which varies somewhat inversely with temperature over a given temperature range.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: February 29, 2000
    Assignees: Lumatronix Manufacturing, Inc., New Anthony, Inc.
    Inventors: Doo Eui Yoon, Eun Chul Shin, Cheong Bon Han