Patents by Inventor James P. Walber

James P. Walber 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).

  • Membrane switch
    Patent number: 4415781
    Abstract: A membrane switch in which switch activation produces a change in the combined resistance and capacitance across leads of the switch.
    Type: Grant
    Filed: November 20, 1981
    Date of Patent: November 15, 1983
    Assignee: W. H. Brady Co.
    Inventors: Norman J. Frame, James P. Walber, Jan M. Janick
  • RC Array
    Patent number: 4412209
    Abstract: A switch assembly with a different combination of resistance and capacitance associated with each of a plurality of switches and with as few as two leads connecting the plurality of switches to external circuitry. The external circuitry detects switch activation by sensing combined resistance and capacitance across the switch leads.
    Type: Grant
    Filed: November 20, 1981
    Date of Patent: October 25, 1983
    Assignee: W. H. Brady Co.
    Inventors: Norman J. Frame, James P. Walber, Jan M. Janick
  • Capacitance switch detection circuitry
    Patent number: 4389583
    Abstract: Detection circuitry for a capacitance switch including a source of two-state electrical pulses that are supplied to two clock nodes 180.degree. out of phase, a buffer connected to one of the switch connection nodes, means between the clock nodes and the switch connections to maintain the buffer input at one condition when the capacitance switch is closed and to cause the buffer input conditions and the buffer output signal to vary with the two-state pulses when the capacitance switch is open, and a frequency detector connected to the buffer output.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: June 21, 1983
    Assignee: W. H. Brady Co.
    Inventor: James P. Walber