Patents by Inventor Takatoshi Ohshika

Takatoshi Ohshika 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).

  • Coated cutting tool
    Patent number: 6565957
    Abstract: A coated cutting tool has high wear resistance in a high-speed cutting operation of steel. The tool is made of a hard sintered substrate and has a hard coating layer deposited on a surface of the substrate. This hard coating layer includes a hard material layer and an inner layer having 0.1 to 10 &mgr;m for an average thickness with residual compressive stress. The inner layer is applied by physical vapor deposition. The hard coating layer also has an aluminum oxide layer as an outer layer having 0.1 to 5 &mgr;m for an average thickness. This outer layer is applied by chemical vapor deposition at a middle temperature.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: May 20, 2003
    Assignee: Mitsubishi Materials Corporation
    Inventors: Eiji Nakamura, Takatoshi Ohshika, Yasuhiko Tashiro, Toshiaki Ueda
  • Coated cutting tool
    Publication number: 20020028323
    Abstract: A coated cutting tool has high wear resistance in a high-speed cutting operation of steel. The tool is made of a hard sintered substrate and has a hard coating layer deposited on a surface of the substrate. This hard coating layer includes a hard material layer and an inner layer having 0.1 to 10 &mgr;m for an average thickness with residual compressive stress. The inner layer is applied by physical vapor deposition. The hard coating layer also has an aluminum oxide layer as an outer layer having 0.1 to 5 &mgr;m for an average thickness. This outer layer is applied by chemical vapor deposition at a middle temperature.
    Type: Application
    Filed: March 30, 2001
    Publication date: March 7, 2002
    Applicant: Mitsubishi Materials Corporation
    Inventors: Eiji Nakamura, Takatoshi Ohshika, Yasuhiko Tashiro, Toshiaki Ueda