Patents by Inventor Johannes Opfermann

Johannes Opfermann 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 detecting thermal conductivity by means of optical pulses
    Patent number: 7038209
    Abstract: The present invention relates to a device for detecting the thermal conductivity by application of optical pulse techniques. A sample preheated in a furnace is exposed to energy by means of an optical pulse. The temperature profile in the sample is recorded by means of an infrared sensor. The thermal conductivity of the sample can then be detected by mathematical derivation. To reduce tho influence of the time history of the optical pulse on measurement, a measuring means is provided for determining this history, An analyzer unit then derives therefrom the corrected temperature profile.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: May 2, 2006
    Assignee: NETZSCH-Geraetebau GmbH
    Inventors: Johannes Opfermann, Juergen Blumm
  • Device for detecting thermal conductivity by means of optical pulses
    Publication number: 20040079886
    Abstract: The present invention relates to a device for detecting the thermal conductivity by application of optical pulse techniques. A sample preheated in a furnace is exposed to energy by means of an optical pulse. The temperature profile in the sample is recorded by means of an infrared sensor. The thermal conductivity of the sample can then be detected by mathematical derivation. To reduce the influence of the time history of the optical pulse on measurement a measuring means is provided for determining this history. An analyzer unit then derives therefrom the corrected temperature profile. In order to reduce the influence of the time history of the optical pulse on measurement a measuring means is provided for determining this history. An analyzer unit then derives therefrom the corrected temperature profile.
    Type: Application
    Filed: September 4, 2003
    Publication date: April 29, 2004
    Inventors: Johannes Opfermann, Juergen Blumm
  • Polyphenylenevinylene photoconductor composition sensitized with a 1,4-bis (styryl) benzene derivative
    Patent number: 3992203
    Abstract: Electrophotographic recording material is disclosed comprising at least one polyphenylenevinylene having a molecular weight greater than 2,000 g/mol and at least one 1,4-bis (styryl) benzene derivative.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: November 16, 1976
    Assignee: VEB Pentacon Dresden
    Inventors: Hans-Heinrich Horhold, Joachim Gottschaldt, Regina Bergmann, Johannes Opfermann, Walter Seliger, Siegfried Augst, Hartmut Arnstadt
  • Photo-conductive coating containing Ge, S, and Pb or Sn
    Patent number: 3966470
    Abstract: As a photoconductive material there is provided a carrier having a coating thereon of a germanium-sulphur-lead alloy or a germanium-sulphur-tin alloy.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: June 29, 1976
    Assignee: VEB Pentacon Dresden
    Inventors: Adalbert Feltz, Johannes Opfermann, Bernd Voigt, Walter Seliger