Patents by Inventor Johannes H. G. Jaegers

Johannes H. G. Jaegers 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).

  • Varying the process of rewriting to extend the life of a information carrier
    Patent number: 6469968
    Abstract: The life of a rewritable information carrier such a CD-E covered by a phase-change recording layer is extended by varying the manner of representing information of an information block, for subsequent recordings, in the same portion of the record carrier. The manner can be changed, for example, by shifting the initial position at which representing information is written along the track over a distance randomly selected within predefined boundaries; or by writing a varying amount of information representing information from the end of the block before the start of information from the beginning of the information block to rotate the information in the track; or by scrambling the information in a varying manner such as using different keys. The manner of representation can be changed, for example, for each subsequent recording on the same portion of the record carrier. This causes different patterns to be recorded in the same portion, even if the same information is recorded in that portion of the track.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: October 22, 2002
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Gijsbert J. Van Den Enden, Johannes H. M. Spruit, Johan P. W. B. Duchateau, Johannes H. G. Jaegers
  • Modifying the recording process to extend the life of a rewritable information carrier
    Patent number: 6115340
    Abstract: The device according to the invention is suitable for recording a rewritable information carrier such a CD-E covered by a phase-change recording layer. As is known, such an information carrier has a limited useful life because the recorded, optically readable patterns start deviating ever more from the desired form when recorded recurrently. The invention is also based on the recognition that this degradation is accelerated if a certain part of the track on the information carrier constantly accommnodates the same patterns, for example, if information blocks are recorded starting from fixed initial positions and the information is represented by the patterns in a specific manner. The device comprises means for shifting the initial position along the track over a distance randomly selected within predefined boundaries and/or for adapting the manner of representation. This causes constantly different patterns to be recorded, even if the same information is to be recorded in a specific part of the track.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: September 5, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Gijsbert J. Van Den Enden, Johannes H. M. Spruit, Johan P. W. B. Duchateau, Johannes H. G. Jaegers