Patents by Inventor John E. Ewalt

John E. Ewalt 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).

  • Detection of devices on a local area network
    Patent number: 6459275
    Abstract: Determining that a slope of test values resulting from two test conditions being applied to a remote device via a network connection and a reference circuit is within a predetermined range, and applying full power to the remote device if the slope is within the predetermined range. The determination using the slope reduces the effects of voltage drop variation caused by diodes and leakage of current by transistors in the remote device. The determination is performed by first applying a first reference voltage to both the remote device and reference circuit and storing the resulting two voltages. Next, a second reference voltage is applied to both the remote device and reference circuit and the resulting two voltages are stored. A first difference is calculated from the two voltages resulting from the testing of the remote device, and a second difference is calculated from the two voltages resulting from the testing of the reference circuit.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: October 1, 2002
    Assignee: Avaya Technology Corp.
    Inventors: John E. Ewalt, Dieter John Henry Knollman
  • DETECTION OF DEVICES ON A LOCAL AREA NETWORK
    Publication number: 20020118023
    Abstract: Determining that a slope of test values resulting from two test conditions being applied to a remote device via a network connection and a reference circuit is within a predetermined range, and applying full power to the remote device if the slope is within the predetermined range. The determination using the slope reduces the effects of voltage drop variation caused by diodes and leakage of current by transistors in the remote device. The determination is performed by first applying a first reference voltage to both the remote device and reference circuit and storing the resulting two voltages. Next, a second reference voltage is applied to both the remote device and reference circuit and the resulting two voltages are stored. A first difference is calculated from the two voltages resulting from the testing of the remote device, and a second difference is calculated from the two voltages resulting from the testing of the reference circuit.
    Type: Application
    Filed: February 28, 2001
    Publication date: August 29, 2002
    Inventors: John E. Ewalt, Dieter John Henry Knollman