Patents by Inventor Henry H. Ng

Henry H. Ng 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).

  • Display device having unpatterned touch detection
    Patent number: 4476463
    Abstract: A display device locates a touch anywhere on a conductive display faceplate by measuring plural electrical impedances of the faceplate conductive coating. The impedances are at electrodes located on different edges of the faceplate. A touch locating circuit determines the location of a touch using known pulsed signals and, in another embodiment, using a tuned measuring signal.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: October 9, 1984
    Assignee: Interaction Systems, Inc.
    Inventors: Henry H. Ng, Bela R. Hatvany
  • Touch terminal with reliable pad selection
    Patent number: 4374381
    Abstract: A touch terminal identifies a single user-selectable, touch-responsive pad element on the display screen for user communication with a data processing system. The terminal makes the identification in response to the durations of pulse signals which vary according to the touch-selection condition of the pad elements. A multiple-step technique of repetitively measuring the signal durations relative to reference values attains essentially error-free pad selection. The operation includes the updating of the reference values of the pulse-signal durations.
    Type: Grant
    Filed: May 1, 1981
    Date of Patent: February 15, 1983
    Assignee: Interaction Systems, Inc.
    Inventors: Henry H. Ng, Frederick R. Schmidt