Patents by Inventor Michael J. C. Van de Donk

Michael J. C. Van de Donk 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).

  • Optically readable information disk
    Patent number: 4389719
    Abstract: An optically readable information disk which comprises a transparent substrate plate (1) of PVC or a copolymer of vinyl chloride which is provided on one side with a reflecting optical structure (2-5) and on the other side with a radiation-cured lacquer layer (6) which is transparent to the laser light (7) used.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: June 21, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Michael J. C. Van de Donk, Hendricus C. A. M. Heinemans, Petrus E. J. Legierse