Patents by Inventor Dean J. Schemmel

Dean J. Schemmel 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).

  • Electrical feed-through bushing cavity insulation detector
    Patent number: 5272442
    Abstract: Apparatus for detecting the sufficiency and quality of an amount of dielectric material contained in the cavity of a transformer bushing is disclosed. The apparatus comprises a collar assembly which when placed over the bushing forms a capacitive element, a tunable signal producer for applying a signal to the capacitive element, a circuit for receiving, amplifying and rectifying the output signal from the capacitive element, and an indicator to detect and indicate the dielectric condition or capacitance of the capacitive element and thus the sufficiency and/or quality of the dielectric material within said bushing assembly. The collar assembly in one embodiment comprises a pair of electrically conductive segments which are hinged together for positioning about the bushing. The interior surfaces of the collar assembly are shaped to conform substantially to the outer shape of the transformer bushing.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: December 21, 1993
    Assignee: Cooper Power Systems, Inc.
    Inventors: Dean J. Schemmel, Charles M. Martin, Augusto D. Hernandez
  • Electrical feed-through bushing cavity insulation detector
    Patent number: 5140270
    Abstract: Apparatus for detecting the sufficiency and quality of an amount of dielectric material contained in the cavity of a transformer bushing is disclosed. The apparatus comprises a collar assembly which when placed over the bushing forms a capacitive element, a tunable signal producer for applying a signal to the capacitive element, a circuit for receiving, amplifying and rectifying the output signal from the capacitive element, and an indicator to detect and indicate the dielectric condition or capacitance of the capacitive element and thus the sufficiency and/or quality of the dielectric material within said bushing assembly.
    Type: Grant
    Filed: March 18, 1991
    Date of Patent: August 18, 1992
    Assignee: Cooper Power Systems, Inc.
    Inventors: Charles M. Martin, Dean J. Schemmel