Patents by Inventor Allan P. Plummer

Allan P. Plummer 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).

  • Method for communication between a first station and a second station, and a controller and remote station using the communication method
    Patent number: 7084741
    Abstract: A method for communicating between a first station and a second station over a wire pair, in which the first station sends an alternating power signal over the wire pair, the alternating power signal comprising a plurality of communication symbols, the second station receiving the alternating power signal and determining therefrom the communication symbols, the second station drawing current from the alternating power signal in a sequence corresponding to at least one further communication symbol, and the first station determining the current drawn in the alternating power signal to recover the further communication symbol.
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: August 1, 2006
    Assignee: Signal Data Systems PTY, Ltd.
    Inventor: Allan P. Plummer
  • Apparatus for monitoring a device powered by the apparatus, and a method for monitoring a device from its power draw
    Patent number: 6731126
    Abstract: An apparatus for monitoring a device (such as a solenoid) powered by the apparatus includes a power supply for providing an alternating power signal to the device and a monitoring circuit that measures a prescribed characteristic of the alternating power signal. A control circuit is responsive to measurements from the monitoring circuit and is arranged to analyze the measurements to determine the status of the device therefrom.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: May 4, 2004
    Assignee: Signal Data Systems Pty Ltd.
    Inventor: Allan P. Plummer
  • Method for communication between a first station and a second station, and a controller and remote station using the communication method
    Publication number: 20020053970
    Abstract: A method for communicating between a first station and a second station over a wire pair, in which the first station sends an alternating power signal over the wire pair, the alternating power signal comprising a plurality of communication symbols, the second station receiving the alternating power signal and determining therefrom the communication symbols, the second station drawing current from the alternating power signal in a sequence corresponding to at least one further communication symbol, and the first station determining the current drawn in the alternating power signal to recover the further communication symbol.
    Type: Application
    Filed: September 4, 2001
    Publication date: May 9, 2002
    Inventor: Allan P. Plummer
  • Apparatus for monitoring a device powered by the apparatus, and a method for monitoring a device from its power draw
    Publication number: 20020033709
    Abstract: An apparatus for monitoring a device powered by the apparatus, comprising; power means for providing an alternating power signal to the device; monitoring means for measuring a prescribed characteristic of said alternating power signal; and control means responsive to said measurements from the monitoring means and arranged to analyse said measurements to determine the status of the device there from.
    Type: Application
    Filed: September 17, 2001
    Publication date: March 21, 2002
    Inventor: Allan P. Plummer