Patents by Inventor Hideaki Inaba

Hideaki Inaba 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).

  • High-strength spring steels and method of producing the same
    Patent number: 5415711
    Abstract: A high-strength spring steel has a high fatigue limit and is characterized by restricting the number of oxide particle inclusion having a diameter of not less than 10 .mu.m in steel to not more than 12 particles/100 mm.sup.2.
    Type: Grant
    Filed: September 21, 1994
    Date of Patent: May 16, 1995
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Masaaki Takagi, Shigeru Takeda, Hideaki Inaba
  • Steel for cold forging and method of making
    Patent number: 4634573
    Abstract: An improved steel for cold forging for machine structural use, particularly, case hardening steel, contents of Al, N and Nb are selected to satisfy a specific corelation therebetween, and the amounts of O and S are controlled. The steel is resistant to cracking at the cold forging, and growth of austenite crystals to coarse grains during carburizing or carbonitriding is prevented.Disclosed are preferable structure of the steel and rolling conditions to obtain the structure, and conditions for continuous casting of the steel.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: January 6, 1987
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Toshio Yanagiya, Kenji Isokawa, Hisashi Ohta, Hideaki Inaba
  • Steel refining method
    Patent number: 4517015
    Abstract: A steel refining method of the type in which the steel is refined through an interfacial reaction between the molten steel in a vessel and a slag on the molten steel. The method simultaneously employs both of blowing of an inert gas into the molten steel from the bottom of the vessel to stir the molten steel by bubbling and blowing an inert gas from the upper side of the vessel into the zone on which the movement of the slag is dull. Consequently, the stirring effect on the molten steel is enhanced to promote the refining reaction. The inert gas can contain a desulfurization agent.
    Type: Grant
    Filed: February 13, 1984
    Date of Patent: May 14, 1985
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Hideaki Inaba, Shuzi Sakakibara