Patents by Inventor Shyoji Nakagama

Shyoji Nakagama 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).

  • Process for the synthesis of hard boron nitride
    Patent number: 5316804
    Abstract: There can be provided a novel and useful process for the synthesis of hard boron nitride consisting essentially of single phase cubic boron nitride by a gaseous phase synthesis technique, which comprises adding a F atom-containing gas to the gaseous phase or adding a F atom-containing gas and H atom-containing gas to the gaseous phase, whereby the codeposited hexagonal boron nitride can selectively be etched and hard boron nitride of substantially single phase can finally be synthesized.
    Type: Grant
    Filed: August 7, 1991
    Date of Patent: May 31, 1994
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tadashi Tomikawa, Nobuhiko Fujita, Shyoji Nakagama, Akira Nakayama