Patents by Inventor Franciscus T. Sleegers

Franciscus T. Sleegers 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 disc with a centering member fixed to a transparent substrate
    Patent number: 5216664
    Abstract: A transparent substrate has an information layer on an entirely flat side, and a centering member on the other side adapted to cooperate with centering means of an apparatus for inscribing and/or reading the disc. The centering member may be glued in place and have an aperture for engagement by an apparatus spindle.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Franciscus T. Sleegers, Pieter D. Schuitmaker, Peter J. M. Janssen
  • Optically readable disc with a centering member fixed to a transparent substrate
    Patent number: 4899329
    Abstract: A transparent substrate has an information layer on an entirely flat side, and a centering member on the other side adapted to cooperate with a centering device of an apparatus for inscribing and/or reading the disc. The centering member may be glued in place and have an aperture for engagement by an apparatus spindle.
    Type: Grant
    Filed: May 2, 1983
    Date of Patent: February 6, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Franciscus T. Sleegers, Pieter D. Schuitmaker, Peter J. M. Janssen