Patents by Inventor Nobuhiko Ibakaki

Nobuhiko Ibakaki 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).

  • Steel wire rod for hard drawn spring,drawn wire rod for hard drawn spring and hard drawn spring, and method for producing hard drawn spring
    Publication number: 20030024610
    Abstract: Disclosed is a steel wire rod for hard-drawn springs capable of exhibiting fatigue strength and sag resistance equivalent to or higher than springs made of an oil-tempered wire. The steel wire rod contains carbon in a range from 0.5 to less than 0.7 mass %, silicon in a range from 1.4 to 2.5 mass %, manganese in a range from 0.5 to 1.5 mass %, chromium in a range from 0.05 to 2.0 mass %, and vanadium in a range from 0.05 to 0.
    Type: Application
    Filed: August 27, 2002
    Publication date: February 6, 2003
    Inventors: Nobuhiko Ibakaki, Atsushi Inada, Sumie Suda, Noritoshi Takamura, Satoru Tendoh, Tadayoshi Fujiwara, Tetsuo Jinbo