Patents by Inventor John G. Eckhardt

John G. Eckhardt 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).

  • Write once magneto-optic media and system
    Patent number: 5599619
    Abstract: An optical data storage medium is comprised of a data layer and a reference layer deposited onto a substrate. The data layer material is comprised of a transition metal rich rare earth-transition metal. The data layer has a destruction temperature greater than its Curie temperature. The reference layer is comprised of a transition metal poor rare earth-transition metal. The reference layer material has a Curie temperature greater than the destruction temperature of the data layer material. The result is a magneto-optic medium which may be recorded upon only once.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: February 4, 1997
    Assignee: International Business Machines Corporation
    Inventors: John G. Eckhardt, Michael M. Farrow, Chien-Jung F. Lin, James C. Suits