Patents by Inventor Kingo Kiyonaga

Kingo Kiyonaga 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).

  • Fully martensitic steel for a metal mold for molding glass and the metal mold
    Patent number: 4218243
    Abstract: A steel which consists essentially of 0.25-0.65% of C, up to 2.50% of Si, up to 2.00% of Mn, 10.00-20.00% of Cr, 4.00-13.00% of Co, 1.00-3.00% of Al, up to 0.25% of N and the balance essentially Fe and ordinary impurities and satisfies the relation:Cr equivalent=-40C(%)+6Si (%)-2Mn(%)+Cr(%)-2Co(%)-30N(%)+12Al(%).ltoreq.13%provides a metal mold which need not be Cr-plated and is suitable of use in molding high-quality glass wares.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: August 19, 1980
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kingo Kiyonaga, Toshio Okuno, Kenji Tokuda
  • High speed tool steel having high toughness
    Patent number: 4116684
    Abstract: A high speed tool steel having high toughness as well as excellent wear resistance and heat resistance characteristics, this steel contains, by weight, C 0.7 - 1.4%, Si 0.5% max., Mn 0.5% max., Cr 3 - 6%, W 1 - 3.2%, Mo 5.5 - 7.5%, V 1 - 3.5%, Co 15% max., N 0.02 - 0.1%, one or more of Ti, Nb, and Zr 0.02 - 0.1% in total and the balance being Fe and incidental impurities. The relationship between tungsten and molybdenum contents of the steel is expressed in the formulated range 12% .ltoreq. W + 2Mo .ltoreq. 16%.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: September 26, 1978
    Assignee: Hitachi Metals, Ltd.
    Inventors: Norimasa Uchida, Kingo Kiyonaga, Hideki Nakamura
  • Back material of metal band saw high in fatigue strength
    Patent number: 4058650
    Abstract: A back material of a metal band saw high in fatigue strength which consists essentially of, by weight, 0.20 - 0.33% C, up to 1.5% Si, up to 1.5% Mn, 3.5 - 6.5% Cr, 0.05 - 0.40% V, 0.05 - 0.10% Al, 0.02 - 0.30% Nb, at least one of 1.0 - 3.0% Mo and up to 4.0% W and the balance Fe and impurities, the sum of (% Mo) + 1/2 (% W) being within the range of 1.0 - 3.0%.
    Type: Grant
    Filed: July 9, 1976
    Date of Patent: November 15, 1977
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kingo Kiyonaga, Ryousei Ago, Sei Furuichi
  • Carbide enriched high speed tool steel
    Patent number: 4032302
    Abstract: A carbide enriched high speed tool steel having good toughness, excellent wear resistance and excellent cutting endurance which by weight consists essentially of 0.62 - 3.95 % of carbon, totally 24 - 50 % of tungsten and twice amount of molybdenum, 3.0 - 5.0 % of chromium, 1.0 - 10.0 % of vanadium, 5 - 15 % of cobalt and the balance consisting essentially of iron and impurities and which is produced by powder metallurgical process.
    Type: Grant
    Filed: December 16, 1975
    Date of Patent: June 28, 1977
    Assignee: Hitachi Metals, Ltd.
    Inventors: Hideki Nakamura, Kingo Kiyonaga