Patents by Inventor Harm Albert Wierenga

Harm Albert Wierenga 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).

  • Patent number: 6904011
    Abstract: The present invention relates to a multilayer record carrier, to a recording apparatus and to a method of recording on such a multilayer record carrier, and to a manufacturing method, wherein start and stop positions of recording areas at header portions (H) are shifted in a lower recording layer (8) by a predetermined distance (?) such that recording and reading in/from the lower layer (8) is not affected by a variation in the transmittivity of the upper layer (6) at the transitions between the recording areas (R) and the header portions. The shifting may be obtained by extending gap portions or adding mirror areas to the header portions (H).
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: June 7, 2005
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Roel Van Woudenberg, Harm Albert Wierenga
  • Publication number: 20020186637
    Abstract: The present invention relates to a multilayer record carrier, to a recording apparatus and to a method of recording on such a multilayer record carrier, and to a manufacturing method, wherein start and stop positions of recording areas at header portions (H) are shifted in a lower recording layer (8) by a predetermined distance (&Dgr;) such that recording and reading in/from the lower layer (8) is not affected by a variation in the transmittivity of the upper layer (6) at the transitions between the recording areas (R) and the header portions. The shifting may be obtained by extending gap portions or adding mirror areas to the header portions (H).
    Type: Application
    Filed: March 19, 2002
    Publication date: December 12, 2002
    Inventors: Roel Van Woudenberg, Harm Albert Wierenga