Patents by Inventor Stefan Knappmann

Stefan Knappmann 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).

  • Optical recording medium with write-once and rewritable properties
    Patent number: 8116192
    Abstract: A write-once optical recording medium is described, which in addition to the write-once properties also has rewritable properties. The optical recording medium has a recording layer with at least a first recording sublayer and a second recording sublayer for recording information marks by alloying material of the at least first and second recording layers. The materials of the at least first and second recording sublayers are chosen such that the alloyed material is a phase-change material adapted for recording additional data as phase changes of the alloyed material.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: February 14, 2012
    Assignee: Thomson Licensing
    Inventor: Stefan Knappmann
  • Optical recording medium for retail activation
    Patent number: 8036096
    Abstract: An optical recording medium to be used for a retail activation solution is proposed. The optical recording medium is a modified ROM disk that can only be played after the application of an activation process. For this purpose at least a part of a reflective layer of a read-only area of the optical recording medium is replaced by a light sensitive layer stack that changes its reflectivity upon illumination. Also proposed are a method for producing such an optical recording medium as well as methods and apparatuses for initializing and/or activating such an optical recording medium.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: October 11, 2011
    Assignee: Thomson Licensing
    Inventors: Stefan Knappmann, Michael Krause, Sergey Khrushchev
  • Optical recording medium for retail activation
    Publication number: 20100157769
    Abstract: An optical recording medium to be used for a retail activation solution is proposed. The optical recording medium is a modified ROM disk that can only be played after the application of an activation process. For this purpose at least a part of a reflective layer of a read-only area of the optical recording medium is replaced by a light sensitive layer stack that changes its reflectivity upon illumination. Also proposed are a method for producing such an optical recording medium as well as methods and apparatuses for initializing and/or activating such an optical recording medium.
    Type: Application
    Filed: December 15, 2009
    Publication date: June 24, 2010
    Inventors: Stefan Knappmann, Michael Krause, Sergey Khrushchev
  • Optical recording medium with write-once and rewritable properties
    Publication number: 20100118681
    Abstract: A write-once optical recording medium is described, which in addition to the write-once properties also has rewritable properties. The optical recording medium has a recording layer with at least a first recording sublayer and a second recording sublayer for recording information marks by alloying material of the at least first and second recording layers. The materials of the at least first and second recording sublayers are chosen such that the alloyed material is a phase-change material adapted for recording additional data as phase changes of the alloyed material.
    Type: Application
    Filed: October 21, 2009
    Publication date: May 13, 2010
    Inventor: Stefan Knappmann