Patents by Inventor Wouter B. Zeper

Wouter B. Zeper 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).

  • Magneto-optical recording medium
    Patent number: 5952094
    Abstract: The addition of Os or Re to the Co layers of a magneto-optical recording medium comprising a Co/X multilayer, where X=Pt, Pd, Au, Ni or Ru, results in a reduction of both the Curie temperature and the magnetization. By virtue thereof, the rewritability of the medium is improved and higher write frequencies can be employed.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: September 14, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Hans W. Van Kesteren, Wouter B. Zeper, Friedrich J. A. Den Broeder, Johannes M. Kerkhof
  • Record carrier for thermo-magnetic recording and magneto-optical readout of information
    Patent number: 5109375
    Abstract: A record carrier for thermomagnetic recording of information and magneto-optical readout of the recorded information. The record carrier includes a substrate and a recording layer thereon in the form of multi-layers of magnetic and non-magnetic material, the magnetic layers predominately containing cobalt and the non-magnetic layers predominantly containing transition metal. The magnetic and non-magnetic layers alternate, and the overall thickness of the complete multi-layer recording layer is less than 75 nm. Such a recording layer achieves a significant improvement in both thermomagnetic write properties and magneto-optical read properties.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: April 28, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Franciscus J. A. M. Greidanus, Peter F. Carcia, Wouter B. Zeper, Friedrich J. A. den Broeder, Willem F. Godlieb