Patents by Inventor Masami Somekawa

Masami Somekawa 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).

  • Machine structure steel superior in chip disposability and mechanical properties and its method of making
    Patent number: 6596227
    Abstract: A machine structure steel superior in chip disposability and mechanical properties which contains sulfide-type inclusions such that those particles of sulfide-type inclusions with major axes not shorter than 5 &mgr;m have an average aspect ratio not larger than 5.2 and which also contains coarse particles of sulfide-type inclusions such that the relation a/b≦0.25 is satisfied, where a denotes the number of particles of sulfide-type inclusions with major axes not shorter than 20 &mgr;m, and b denotes the number of particles of sulfide-type inclusions with major axes not shorter than 5 &mgr;m. The machine structure steel exhibits good chip disposability and mechanical properties despite its freedom from lead.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: July 22, 2003
    Assignee: Kobe Steel, Ltd.
    Inventors: Yosuke Shindo, Hiroshi Yaguchi, Takehiro Tsuchida, Koichi Sakamoto, Masato Kaiso, Masami Somekawa, Ikuo Hoshikawa, Sei Kimura
  • Free machining steel for use in machine structure of excellent mechanical characteristics
    Patent number: 6579385
    Abstract: Free machining steel for use in machine structures capable of stably and reliably providing excellent machinability (chip disposability and tool life) and mechanical characteristics (transverse direction toughness) comparable, in a Pb free state, with existent Pb-added steels the machining steel being manufactured so as to contain 0.0005 to 0.02 mass % of Mg and provide a distribution index F1 for the sulfide particles defined by the following equation (1) of 0.4 to 0.65 or a distribution index for the sulfide particles defined by the following equation (2) of 1 to 2.5: F1=X1/(A/n)½  (1), or F2=&sgr;F/X2  (2) as described in the specification.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: June 17, 2003
    Assignee: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Hiroshi Yaguchi, Yosuke Shindo, Takehiro Tsuchida, Takahiro Kudou, Masato Kaiso, Masami Somekawa
  • Free machining steel for use in machine structure of excellent mechanical characteristics
    Publication number: 20020044878
    Abstract: Free machining steel for use in machine structures capable of stably and reliably providing excellent machinability (chip disposability and tool life) and mechanical characteristics (transverse direction toughness) comparable, in a Pb free state, with existent Pb-added steels the machining steel being manufactured so as to contain 0.0005 to 0.02 mass % of Mg and provide a distribution index F1 for the sulfide particles defined by the following equation (1) of 0.4 to 0.65 or a distribution index for the sulfide particles defined by the following equation (2) of 1 to 2.
    Type: Application
    Filed: August 17, 2001
    Publication date: April 18, 2002
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Hiroshi Yaguchi, Yosuke Shindo, Takehiro Tsuchida, Takahiro Kudou, Masato Kaiso, Masami Somekawa
  • Machine structure steel superior in chip disposability and mechanical properties
    Publication number: 20020044879
    Abstract: A machine structure steel superior in chip disposability and mechanical properties which contains sulfide-type inclusions such that those particles of sulfide-type inclusions with major axes not shorter than 5 &mgr;m have an average aspect ratio not larger than 5.2 and which also contains coarse particles of sulfide-type inclusions such that the following relation is satisfied.
    Type: Application
    Filed: August 24, 2001
    Publication date: April 18, 2002
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yosuke Shindo, Hiroshi Yaguchi, Takehiro Tsuchida, Koichi Sakamoto, Masato Kaiso, Masami Somekawa, Ikuo Hoshikawa, Sei Kumura