Patents by Inventor Yung-Feng Li

Yung-Feng Li 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).

  • Far-distance remotely controllable rectifier with back-up battery
    Patent number: 6208118
    Abstract: A far-distance remotely controllable rectifier with a back-up battery may be applied to any electric appliance that requires a rectifier, and particularly to a wireless phone or the like telecommunication equipment, to serve as an uninterrupted power supply. A replaceable and rechargeable back-up battery and a ring-controlled switch circuit are provided to the rectifier of this invention to keep the machine working in case of an unexpected failure of the civil power or in response to detection of a phone call from a far distance to a ring-controlled switch for effecting a continuous power supply. Under normal conditions, the civil power is used to charge the back-up battery as a stand-by power source.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: March 27, 2001
    Assignee: Digi Power Manufacturing Inc.
    Inventor: Yung-Feng Li
  • On-line UPS controllable from far end
    Patent number: 6175311
    Abstract: An ON-LINE uninterrupted power supply (UPS) of this invention serving as a long term high quality power supply for web, telecommunication, security system, etc is characterized in detecting a ring signal from far end for ON/OFF control of an output power and in permitting omni-range input civil power to avoid any unstable output power.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: January 16, 2001
    Assignee: Digipower Manufacturing Inc.
    Inventor: Yung-Feng Li