Patents by Inventor Christoph Gramsch

Christoph Gramsch 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).

  • Apparatus for VLF-voltage testing of cables
    Patent number: 8970223
    Abstract: An apparatus for testing a cable or other capacitive load object with a VLF alternating cosine square, rectangular or trapezoidal test voltage, includes one or two DC voltage sources and a switching arrangement controlled by a measuring and control unit, to produce the test voltage with alternating switched polarity. The apparatus further includes a choke coil serving as an energy store, which is controlled by a switching element to be activated if the voltage/time slope arising during the switch-over after a respective half-wave of the test voltage falls below a defined threshold value.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: March 3, 2015
    Assignee: Hagenuk KMT Kabelmesstechnik GmbH
    Inventors: Sven Scheuschner, Nico Stechemesser, Dirk Bechler, Christoph Gramsch, Torsten Berth
  • Apparatus for VLF-Voltage Testing of Cables
    Publication number: 20130106451
    Abstract: An apparatus for testing a cable or other capacitive load object with a VLF alternating cosine square, rectangular or trapezoidal test voltage, includes one or two DC voltage sources and a switching arrangement controlled by a measuring and control unit, to produce the test voltage with alternating switched polarity. The apparatus further includes a choke coil serving as an energy store, which is controlled by a switching element to be activated if the voltage/time slope arising during the switch-over after a respective half-wave of the test voltage falls below a defined threshold value.
    Type: Application
    Filed: October 29, 2012
    Publication date: May 2, 2013
    Inventors: Sven Scheuschner, Nico Stechemesser, Dirk Bechler, Christoph Gramsch, Torsten Berth