Patents by Inventor Hideaki Ohtaka

Hideaki Ohtaka 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).

  • Non-heat treated steel for hot forging with easy fracture splitting
    Patent number: 7670444
    Abstract: Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of: by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%, N: 0.005-0.03% and the balance being Fe and inevitable impurities, provided that the contents of C, Mn and Cr fulfill the following condition: 1.40[C %]+0.28[Mn %]+0.50[Cr %]?0.75 Pearlite area fraction in this steel after hot forging is 50% or more. Notches are provided with laser beam on an intermediate part at the location from which fracture starts, and load is applied. Then, the intermediate is split to be two components (big end or cap and small end/rod for connecting rod). The components are adhered to form the parts.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: March 2, 2010
    Assignees: Daido Steel Co., Ltd., Nissan Motor Co., Ltd.
    Inventors: Koichiro Inoue, Sadayuki Nakamura, Kouji Itakura, Yoshio Okada, Noriyuki Shiwaku, Jun Yoshida, Tomonori Miyazawa, Hideaki Ohtaka, Hidetoshi Satou, Wataru Naitou
  • Non-heat treated steel for hot forging with easy fracture splitting
    Publication number: 20030098095
    Abstract: Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of; by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%, N: 0.005-0.03% and the balance being Fe and inevitable impurities, provided that the contents of C, Mn and Cr fulfill the following condition: 1.40[C %]+0.28[Mn %1]+0.50[Cr %]≧0.75 Pearlite area fraction in this steel after hot forging is 50% or more. Notches are provided with laser beam on an intermediate part at the location from which fracture starts, and load is applied. Then, the intermediate is split to be two components (big end or cap and small end/rod for connecting rod). The components are adhered to form the parts.
    Type: Application
    Filed: March 20, 2002
    Publication date: May 29, 2003
    Inventors: Koichiro Inoue, Sadayuki Nakamura, Kouji Itakura, Yoshio Okada, Noriyuki Shiwaku, Jun Yoshida, Tomonori Miyazawa, Hideaki Ohtaka, Hidetoshi Satou, Wataru Naitou
  • Floating board for swimming or the like
    Patent number: D323371
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: January 21, 1992
    Inventor: Hideaki Ohtaka