Patents by Inventor Sigetomi Miyoshi

Sigetomi Miyoshi 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).

  • Oval cross section metal tube producing device and producing method
    Patent number: 7219522
    Abstract: It is an object of the present invention to provide a novel aluminum tube of an oval cross section that has a wider range of applications and added values. A disk-shaped metal slug (21) is impact-extruded with the use of a die (14) and a punch (13) each having an optimally designed structure to form a metal tube (T) integrally including a mouth, a shoulder and a body of an oval cross section. A hem portion of the oval body of the tube (T) thus formed and hardened by the impact extrusion is once deformed into a circular shape, and then trimmed off by a turning operation.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: May 22, 2007
    Assignee: Taisai Kako Co., Ltd.
    Inventors: Yuji Maeda, Sigetomi Miyoshi, Takahiro Yamaguchi
  • Oval cross section metal tube producing device and producing method
    Publication number: 20050247097
    Abstract: It is an object of the present invention to provide a novel aluminum tube of an oval cross section that has a wider range of applications and added values. A disk-shaped metal slug (21) is impact-extruded with the use of a die (14) and a punch (13) each having an optimally designed structure to form a metal tube (T) integrally including a mouth, a shoulder and a body of an oval cross section. A hem portion of the oval body of the tube (T) thus formed and hardened by the impact extrusion is once deformed into a circular shape, and then trimmed off by a turning operation.
    Type: Application
    Filed: July 25, 2003
    Publication date: November 10, 2005
    Inventors: Yuji Maeda, Sigetomi Miyoshi, Takahiro Yamaguchi