Patents by Inventor Thomas Wilhemus Engelen

Thomas Wilhemus Engelen 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).

  • Method of manufacturing a stamper for producing optical discs, a stamper thus obtained and an optical disc obtained by using such a stamper
    Patent number: RE39434
    Abstract: The invention relates to a method of manufacturing a stamper for producing optical disks, comprising the application of a photoresist to a stamper plate and the structuring of the applied photoresist film. The structuring comprises the successive exposure, development and heating of the photoresist film. The developed photoresist film is subjected to an additional exposure in the deep UV range prior to the final heat treatment. The invention also relates to a stamper and to an optical disk obtained using the stamper.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: December 19, 2006
    Assignee: OTB Group B.V.
    Inventors: Thomas Wilhemus Engelen, Walter T. M. Stals, Jacobus J. T. T. Vermeijlen