Patents by Inventor Donghua Gu

Donghua Gu 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).

  • Cold cathode gauge fast response signal circuit
    Patent number: 8928329
    Abstract: A fast response output signal circuit (10) for a cold cathode gauge is provided to produce a fast response output signal (48) in addition to a voltage output signal (40) that is representative of the pressure in the cold cathode gauge. The fast response output signal (48) is either on or off, thus can be used to trigger a closing of an isolation valve or other responsive action upon a change in pressure that attains or exceeds a certain set point threshold. The fast response output signal is produced and processed with analog circuits, but the set point is produced with a microprocessor. The voltage output signal can be produced as a logarithmic function of the pressure.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: January 6, 2015
    Assignee: MKS Instruments, Inc.
    Inventors: Bert Downing, Donghua Gu, Neil T. Peacock
  • COLD CATHODE FAST RESPONSE SIGNAL
    Publication number: 20130249563
    Abstract: A fast response output signal circuit (10) for a cold cathode gauge is provided to produce a fast response output signal (48) in addition to a voltage output signal (40) that is representative of the pressure in the cold cathode gauge. The fast response output signal (48) is either on or off, thus can be used to trigger a closing of an isolation valve or other responsive action upon a change in pressure that attains or exceeds a certain set point threshold. The fast response output signal is produced and processed with analog circuits, but the set point is produced with a microprocessor. The voltage output signal can be produced as a logarithmic function of the pressure.
    Type: Application
    Filed: July 26, 2012
    Publication date: September 26, 2013
    Inventors: Bert Downing, Donghua Gu, Neil T. Peacock