Patents by Inventor Yin-Cheung Ma

Yin-Cheung Ma 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).

  • Patent number: 9178368
    Abstract: An information handling system battery has first and second protective circuits to detect and address faults for a first charge applied from an external power source to an integrated charger and a second charge applied from a charger of an information handling system to battery cells. If the first protective circuit detects a fault associated with the integrated charger, charging of the battery cells is still supported by inserting the battery in an information handling system. If the second protective circuit detects a fault, the battery becomes inoperative by disconnecting the battery cells. An indicator, such as LEDs on the battery casing, indicates whether a soft or hard fault has occurred.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: November 3, 2015
    Assignee: Dell Products L.P.
    Inventors: Ligong Wang, Gerald Courtney, Jr., Yin-Cheung Ma
  • Publication number: 20140035515
    Abstract: An information handling system battery has first and second protective circuits to detect and address faults for a first charge applied from an external power source to an integrated charger and a second charge applied from a charger of an information handling system to battery cells. If the first protective circuit detects a fault associated with the integrated charger, charging of the battery cells is still supported by inserting the battery in an information handling system. If the second protective circuit detects a fault, the battery becomes inoperative by disconnecting the battery cells. An indicator, such as LEDs on the battery casing, indicates whether a soft or hard fault has occurred.
    Type: Application
    Filed: October 1, 2013
    Publication date: February 6, 2014
    Applicant: Dell Products L.P.
    Inventors: Ligong Wang, Gerald Courtney, JR., Yin-Cheung Ma
  • Patent number: 8552689
    Abstract: An information handling system battery has first and second protective circuits to detect and address faults for a first charge applied from an external power source to an integrated charger and a second charge applied from a charger of an information handling system to battery cells. If the first protective circuit detects a fault associated with the integrated charger, charging of the battery cells is still supported by inserting the battery in an information handling system. If the second protective circuit detects a fault, the battery becomes inoperative by disconnecting the battery cells. An indicator, such as LEDs on the battery casing, indicates whether a soft or hard fault has occurred.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: October 8, 2013
    Assignee: Dell Products L.P.
    Inventors: Ligong Wang, Gerald Courtney, Jr., Yin-Cheung Ma
  • Publication number: 20090251406
    Abstract: An information handling system has a chassis and a lid, the lid rotating between a closed position and a tablet position. An indicator coupled to the lid, such as a magnet, aligns with a first detector coupled to a chassis of the information handling system, such as a Hall effect detector, in the tablet position so that the detector signals to a position detector module to disable a keyboard of the information handling system. The indicator aligns with a second detector coupled to the chassis in a closed configuration so that the second detector signals to the position detector module to enter a power down state.
    Type: Application
    Filed: April 2, 2008
    Publication date: October 8, 2009
    Inventors: Philip Seibert, Marie Chagny, Kyle David Spiess, Charles Robison, Angela Stern, Yin-Cheung Ma, John Lerma
  • Publication number: 20090051315
    Abstract: An information handling system battery has first and second protective circuits to detect and address faults for a first charge applied from an external power source to an integrated charger and a second charge applied from a charger of an information handling system to battery cells. If the first protective circuit detects a fault associated with the integrated charger, charging of the battery cells is still supported by inserting the battery in an information handling system. If the second protective circuit detects a fault, the battery becomes inoperative by disconnecting the battery cells. An indicator, such as LEDs on the battery casing, indicates whether a soft or hard fault has occurred.
    Type: Application
    Filed: August 24, 2007
    Publication date: February 26, 2009
    Inventors: Ligong Wang, Gerald Courtney, JR., Yin-Cheung Ma