Patents by Inventor Dai MIYASHITA

Dai MIYASHITA 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).

  • Publication number: 20210001409
    Abstract: A surface-coated cutting tool has excellent welding resistance and fracturing resistance and comprises a hard coating layer, including at least a lower layer and an upper layer, formed on a surface of a cutting tool body. The lower layer is formed of one layer or two or more layers of a TiC layer, a TiN layer, a TiCN layer, a TiCO layer, and a TiCNO layer. The upper layer is found as an Al2O3 layer on a surface of the lower layer. On at least an outermost surface of the upper layer of a rake face, a zirconium oxide layer is formed in an area ratio of 30% to 70%. The Al2O3 layer on the rake face has a tensile residual stress of 10 to 200 MPa and a surface roughness Ra is 0.25 ?m or less.
    Type: Application
    Filed: March 29, 2017
    Publication date: January 7, 2021
    Applicant: MITSUBISHI MATERIALS CORPORATION
    Inventors: Masataka DOBASHI, Dai MIYASHITA, Yoshinori KAWATA, Takushi SAEKI, Hiroshi OHMORI, Hisashi HARA, Yoshitomo SHIBUYA, Akira SOBANA