Patents by Inventor Andreas Kemna

Andreas Kemna 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).

  • Device for the simultaneous application of electrical signals and measurement of the electrical potential in a sample
    Patent number: 7106076
    Abstract: An electrode, in the form of a spike, for insertion into a sample, has a large-area jacket adapted for applying an excitation current to the sample and a small-area tip electrically decoupled from the jacket, at which a potential measurement is made.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: September 12, 2006
    Assignee: Forschungszentrum Julich GmbH
    Inventors: Axel Tillmann, Andreas Kemna, Egon Zimmermann, Walter Glaas, Arre Verweerd
  • Method and apparatus for rapid tomographic measurements of the electrical conductivity distribution of a sample
    Patent number: 6943553
    Abstract: A method and apparatus for the rapid tomographic measurement of conductivity distribution in a sample in which current excitations or voltage excitation is applied to the sample via electrodes or the like and potential differences or magnetic field strengths association with those excitation fields are measured and analyzed, e.g. by a Fourier analysis.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: September 13, 2005
    Assignee: Forschungszentrum Julich GmbH
    Inventors: Egon Zimmermann, Walter Glaas, Arre Verweerd, Axel Tillmann, Andreas Kemna
  • Method and device for making a metal strand
    Patent number: 6880616
    Abstract: A method and device for producing a strand of metal by means of a continuous-casting installation which has at least one cooling device for cooling the strand, the cooling device being assigned at least one reduction stand for reducing the thickness of the strand, the strand, during the thickness reduction, having a solidified skin and a liquid core. The cooling is set, by means of a temperature and solidification model, in such a manner that the solidification boundary between the solidified skin and the liquid core when the strand enters the reduction stand corresponds to a predetermined set solidification boundary between the solidified skin and the liquid core.
    Type: Grant
    Filed: June 29, 2000
    Date of Patent: April 19, 2005
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andreas Kemna, Albrecht Sieber, Uwe Stürmer, Hans-Herbert Welker
  • Device for the simultaneous application of electrical signals and measurement of the electrical potential in a sample
    Publication number: 20040222805
    Abstract: An electrode, in the form of a spike, for insertion into a sample, has a large-area jacket adapted for applying an excitation current to the sample and a small-area tip electrically decoupled from the jacket, at which a potential measurement is made.
    Type: Application
    Filed: August 22, 2003
    Publication date: November 11, 2004
    Applicant: FORSCHUNGSZENTRUM JULICH GmbH
    Inventors: Axel Tillmann, Andreas Kemna, Egon Zimmermann, Walter Glaas, Arre Verweerd
  • Method and apparatus for rapid tomographic measurements of the electrical conductivity distribution of a sample
    Publication number: 20040201380
    Abstract: A method and apparatus for the rapid tomographic measurement of conductivity distribution in a sample in which current excitations or voltage excitation is applied to the sample via electrodes or the like and potential differences or magnetic field strengths association with those excitation fields are measured and analyzed, e.g. by a Fourier analysis.
    Type: Application
    Filed: August 22, 2003
    Publication date: October 14, 2004
    Applicant: FORSCHUNGSZENTRUM JULICH GmbH
    Inventors: Egon Zimmermann, Walter Glaas, Arre Verweerd, Axel Tillmann, Andreas Kemna