Patents by Inventor Henry Hoo

Henry Hoo 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).

  • Circuit arrangement for operating light sources
    Patent number: 7053563
    Abstract: In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. Owing to the combination of a dual charge pump and a valley fill circuit it is also possible to adhere to relevant standards for rated current harmonics even at rated powers of over 25 W whilst maintaining low component loading.
    Type: Grant
    Filed: January 3, 2005
    Date of Patent: May 30, 2006
    Assignee: Patent Treuhand Gesellschaft fur elektrische Gluhlampen mbH
    Inventors: Henry Hoo, Ken Liu, Harald Schmitt, Rene Twardzik
  • Circuit arrangment for operating light sources
    Publication number: 20050151481
    Abstract: In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. Owing to the combination of a dual charge pump and a valley fill circuit it is also possible to adhere to relevant standards for rated current harmonics even at rated powers of over 25 W whilst maintaining low component loading.
    Type: Application
    Filed: January 3, 2005
    Publication date: July 14, 2005
    Applicant: PATENT-TREUHAND-GESELLSCHAFT FUR ELEKTRISCH GLUHLAMPEN MBH
    Inventors: Henry Hoo, Ken Liu, Harald Schmitt, Rene Twardzik