Patents by Inventor Kideki Ohkawa

Kideki Ohkawa 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).

  • Information storage medium
    Patent number: 4985349
    Abstract: An information storage medium comprises a substrate and a recording layer formed on the substrate containing Te, Ge, C and H. The recording layer is formed by sputtering, with a Ge-Te alloy being used as a target and with a mixed gas of a noble gas and a hydrocarbon being used as a sputtering gas. The hydrocarbon content in the sputtering gas falls within a range of 3 to 35%. The composition of the target is Ge.sub.x Te.sub.100-x (where x is expressed by atomic %, and 5.ltoreq.x.ltoreq.20).
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: January 15, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kideki Ohkawa, Norio Ozawa, Motonari Matsubara