Patents by Inventor Edgar T. Guenther, Jr.

Edgar T. Guenther, Jr. 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).

  • Low frequency suppression circuit for a time domain reflectometer
    Patent number: 6124717
    Abstract: An improved time domain reflectometer (TDR) includes a capacitor coupled in series between a transmission medium under test and the TDR receiver input. A switch, operating under microprocessor control, selectively couples and uncouples the capacitor to a voltage reference, such as ground. During the generation of interrogating pulses from the TDR and the acquisition of data from the transmission medium under test, the capacitor is uncoupled from the voltage reference and acts as a DC blocking capacitor. During periods of non-TDR activity, the capacitor is coupled to voltage reference and acts as a load for low frequency interference appearing on the transmission medium. The capacitor-switch operation blocks low frequency interference signals from the receiver input of the TDR.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: September 26, 2000
    Assignee: Tektronix, Inc.
    Inventors: Edgar T. Guenther, Jr., Ronald J. Larrick
  • Time domain reflectometer having optimal interrogating pulses
    Patent number: 6097755
    Abstract: An improved pulse generator circuit includes a pulse shaper circuit for generating interrogating bipolar pulse having reduced or no energy at zero frequency for use in a measurement test instrument for characterizing a transmission medium, such a twisted pair and coaxial transmission cables.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: August 1, 2000
    Assignee: Tektronix, Inc.
    Inventors: Edgar T. Guenther, Jr., Stanley C. Edwards