Patents by Inventor Geoff Chen

Geoff Chen 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).

  • Switching type AC adapter
    Patent number: 6072706
    Abstract: A switching type AC adapter includes a current mode PWM (pulse-width-modulated) controller, a monostable multivibrator, and a MOSFET so arranged that the current mode PWM controller and the monostable multivibrator are operated to let switching of the MOSFET be synchronized to synchronous signal from a synchronous circuit when the switching type AC adapter is electrically connected, enabling horizontal synchronizing interference to be concealed behind retrace time, and kept away from the screen of video equipment in which the switching type AC adapter is installed.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: June 6, 2000
    Assignee: Proton Electronic Industrial Co., Ltd.
    Inventor: Geoff Chen