Patents by Inventor Masaru Sumitani

Masaru Sumitani 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).

  • Tooth rolling flat dies and method for forming teeth
    Patent number: 6598453
    Abstract: A tooth rolling flat die and a method for forming a tooth are provided. The die has the same service life as those of the conventional tooth rolling flat dies using oil coolant even if conducted by semi-dry forming. A first substantially quarter length portion of the leading teeth section of the die has a first surface roughness Rz of maximum height ranging from 20 to 35 &mgr;m, and a second substantially quarter length portion of the leading teeth section of the die has a second surface roughness Rz of maximum height ranging from 5 to 20 &mgr;m. The die is adapted for semi-dry forming the tooth.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: July 29, 2003
    Assignee: Nachi-Fujikoshi Corp.
    Inventors: Yasuhiro Murai, Takahiro Kumagai, Soiti Kakutani, Masaru Sumitani
  • Tooth rolling flat dies and method for forming teeth
    Publication number: 20020043094
    Abstract: A tooth rolling flat die and a method for forming a tooth are provided. The die has the same service life as those of the conventional tooth rolling flat dies using oil coolant even if conducted by semi-dry forming. Wherein the die comprises the surface roughness Rz of the first substantially quarter length portion of the leading teeth section wherein heights of the tops of the teeth are gradually increasing, ranging 20 to 35 &mgr;m, and that Rz of the second substantially quarter length portion of the leading teeth section, ranging 5 to 20 &mgr;m. The die is adapted for semi-dry forming the tooth.
    Type: Application
    Filed: October 5, 2001
    Publication date: April 18, 2002
    Inventors: Yasuhiro Murai, Takahiro Kumagai, Soiti Kakutani, Masaru Sumitani