Patents by Inventor Frederik B. Nusselder

Frederik B. Nusselder 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).

  • Patent number: 4874085
    Abstract: High storage density information carriers, particularly optically readable video discs and digital records, can only be read error-free by a playback device when the high requirements made of freedom from warping also remain guaranteed over long storage times. A cassette is provided to support and fix an information carrier only within its central portion which is free of information tracks and, by a sufficient spacing of the information carrier in the support-free area between a bottom portion and a cover portion contact with the information carrier in this area is avoided, even given consideration of maximally-admissible warping tolerances of the storage cassette and of the information carrier.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: October 17, 1989
    Assignee: Polygram GmbH
    Inventors: Hermann Grobecker, Werner Heher, Adelbert Zielasek, Frederik B. Nusselder
  • Patent number: 4535888
    Abstract: A storage cassette suitable for the simultaneous storage of two and more tracked disks is provided with a box-shaped center part having an intermediate bottom part which is respectively terminated at its upper side and under side with a cover in the form of a box-shaped floor part, whereby each floor part is hingeable mounted in a hinge at one side at the center part. The cassette construction enables a disk to be supported and held in the cassette adjacent each floor part and on either side of the intermediate bottom part by virtue of a raised seat and peg arrangement centrally disposed on those parts.
    Type: Grant
    Filed: January 16, 1984
    Date of Patent: August 20, 1985
    Assignee: Polygram GmbH
    Inventor: Frederik B. Nusselder