Patents by Inventor Naoto Kanbara

Naoto Kanbara 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).

  • Surface treated steel cutting tool
    Patent number: 6220797
    Abstract: An inexpensive steel cutting tool with excellent cutting characteristics and cutting life is provided to have a cutting part having a chamfered cutting edge and a surface hardening layer formed therein, wherein surface treatment is performed by forming a sufficiently thick surface hardening layer on the surface of steel base material, or by forming a hard coating film on the surface hardening layer.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: April 24, 2001
    Assignee: Sumitomo Metal Minning Co.
    Inventors: Yoshiro Ishii, Naoto Kanbara