Patents by Inventor Henry Tat-Sang Fung

Henry Tat-Sang Fung 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).

  • System and method of computer operating mode clock control for power consumption reduction
    Patent number: 6584571
    Abstract: A power management unit for use in a computer system includes an activity monitor which monitors activity of the computer system and generates an activity indicator signal reflective of the monitored activity, a mode controller responsive to the activity indicator signal and having at least three operating modes, and a power switching circuit having a plurality of power control signal lines each for controlling one of the plurality of power control switches.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: June 24, 2003
    Assignee: St. Clair Intellectual Property Consultants, Inc.
    Inventor: Henry Tat-Sang Fung
  • System and method of computer operating mode control for power consumption reduction
    Patent number: 6079025
    Abstract: An activity sensing power reduction and conservation apparatus, system, and method for a computer system. The computer system has resources including a processor, a memory, and an input/output device, and an operating system for controlling the resources. At least one of the resources can be placed into in any one of three operating modes including a first mode having a first power consumption level, a second mode having a second power consumption level less than the first level, and a third mode having a third level less than the second level. The first mode may be characterized by maintaining clocking of the processor at a first clock frequency, the second mode by clocking the processor at a second clock frequency less than the first frequency or by not maintaining clocking of the processor, and the third mode by maintaining operation of the memory to preserve the integrity of any stored memory contents.
    Type: Grant
    Filed: July 23, 1998
    Date of Patent: June 20, 2000
    Assignee: Vadem
    Inventor: Henry Tat-Sang Fung
  • Computer activity monitor providing idle thread and other event sensitive clock and power control
    Patent number: 5892959
    Abstract: A power conservation system for use in a computer system. The power system has an activity monitor and a plurality of modes of operation. The activity monitor can place the computer system in a reduced power consumption state during periods of low activity without waiting for a period of complete inactivity. By controlling the power mode in response to the activity of the computer system, the power consumption of the computer system can be controlled.
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: April 6, 1999
    Assignee: Vadem
    Inventor: Henry Tat-Sang Fung
  • Activity monitor for computer system power management
    Patent number: 5799198
    Abstract: A power conservation system for use in a computer system. The power system has an activity monitor and a plurality of power modes of operation. The activity monitor detects the activity level of the computer system through hardware and/or software. By controlling the power mode of operation in response to the activity of the computer system, the power consumption of the computer system can be controlled.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: August 25, 1998
    Assignee: Vadem Corporation
    Inventor: Henry Tat-Sang Fung
  • Multi-mode power switching for computer systems
    Patent number: 5758175
    Abstract: A power conservation system for use in a computer system. The power conservation system has an activity monitor and a plurality of modes of operation. The power conservation system has a power switching unit which couples the power supply to a selected group of the computer system circuits depending upon the power mode of operation. By controlling the power mode in response to the activity of the computer system, the power consumption of the computer system can be controlled.
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: May 26, 1998
    Assignee: Vadem
    Inventor: Henry Tat-Sang Fung
  • Multi-state power management for computer systems
    Patent number: 5710929
    Abstract: A power conservation system for use in a computer system. The power conservation system has an activity mointor and a plurality of modes of operation. By controlling the power mode of operation in response to the activity of the computer system, the power consumption of the computer system is controlled. Coupling of circuit power and clock signals are used to control power consumption and both hardware and software components may separately or together monitor and control operation.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: January 20, 1998
    Assignee: Vadem Corporation
    Inventor: Henry Tat-Sang Fung