Patents Assigned to Docdata BV
  • Optical medium
    Patent number: 4531136
    Abstract: A medium for recording optically readable information, comprising a transparent substrate layer, a semi reflective recording layer of a material which can melt, atomize or evaporate under the influence of light, and a separating layer is disclosed. Holes are put into the separating layer with a regular pattern with the holes extending through the complete thickness of the layer.
    Type: Grant
    Filed: June 2, 1983
    Date of Patent: July 23, 1985
    Assignee: Docdata BV
    Inventor: Joseph M. E. Beaujean