Patents Assigned to Dr. Johannes Heidenhaln GmbH
  • High resolution recording medium and method for producing same
    Patent number: 4151321
    Abstract: A high resolution recording medium is provided which employs at least two layers of inorganic material which act as filters for two different colors of visible light. In one embodiment, microphoto lithography techniques are used to create microinterference filters in the desired patterns on a glass substrate. Recording media constructed according to this invention exhibit increased stability with respect to time and improved resistance to light and heat damage as compared with prior art recording media employing organic dyes.
    Type: Grant
    Filed: December 12, 1977
    Date of Patent: April 24, 1979
    Assignee: Dr. Johannes Heidenhaln GmbH
    Inventor: Leopold Hiesinger