Patents by Inventor Ralf Koppert

Ralf Koppert 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).

  • Film resistor with a constant temperature coefficient and production of a film resistor of this type
    Patent number: 8198978
    Abstract: The invention relates to a film resistor (1) comprising a carbon-containing material (3) into which clusters (4) of conductive cluster material are introduced, wherein the conductive cluster material has a positive temperature coefficient. The clusters (4) are surrounded by a graphite casing and embedded in the carbon-containing material (3). Furthermore, the cluster material is present in a thermodynamically stable phase.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: June 12, 2012
    Assignees: Hochschule fur Technik und Wirtschaft des Sarlandes, Siegert Thinfilm Technology GmbH
    Inventors: Günther Schultes, Dirk Göttel, Ralf Koppert, Olivia Freitag-Weber, Ulf Werner, Wolfgang Brode
  • FILM RESISTOR WITH A CONSTANT TEMPERATURE COEFFICIENT AND PRODUCTION OF A FILM RESISTOR OF THIS TYPE
    Publication number: 20110102127
    Abstract: The invention relates to a film resistor (1) comprising a carbon-containing material (3) into which clusters (4) of conductive cluster material are introduced, wherein the conductive cluster material has a positive temperature coefficient. The clusters (4) are surrounded by a graphite casing and embedded in the carbon-containing material (3). Furthermore, the cluster material is present in a thermodynamically stable phase.
    Type: Application
    Filed: April 6, 2009
    Publication date: May 5, 2011
    Inventors: Günther Schultes, Dirk Göttel, Ralf Koppert, Olivia Freitag-Weber, Ulf Werner, Wolfgang Brode