Patents by Inventor Shirou Okayama

Shirou Okayama 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).

  • Aluminum oxide-coated article
    Patent number: 6333103
    Abstract: An aluminum oxde-coated article has a first coating layer and a second coating layer formed in this order on a substrate, the first coating layer having a single- or multi-layer structure and being made of at least one selected from the group consisting of carbides, nitrides, carbonitrides, oxides, oxycarbides, oxynitrides and oxycarbonitrides of metals in Groups IVa, Va and VIa of the Periodic Table, and the second coating layer being constituted by at least one &agr;-aluminum oxide-based oxide layer, which has an equivalent X-ray diffraction peak ratio PR (1 0 10) of 1.3 or more in a (1 0 10) plane.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: December 25, 2001
    Assignees: Hitachi Metals, Ltd., Hitachi Tools Engineering, Ltd.
    Inventors: Toshio Ishii, Masayuki Gonda, Hiroshi Ueda, Shirou Okayama, Nobuhiko Shima