Patents by Inventor Katsutaro Akamatsu

Katsutaro Akamatsu 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 corrosion resistant and high strength medium Cr and low Ni stainless cast steel
    Patent number: 4224061
    Abstract: A high corrosion resistant and high strength medium Cr and low Ni stainless cast steel which is produced from material including predetermined amounts of elements at predetermined weight percentage and remaining portion substantially of Fe. When the above material is further subjected to heat treatments under predetermined conditions, stainless steels superior in yield strength and having stable corrosion resistance against circumstances influenced by strong acids are presented.
    Type: Grant
    Filed: July 28, 1978
    Date of Patent: September 23, 1980
    Assignee: Kubota Ltd.
    Inventors: Hisashi Hiraishi, Toshiaki Morichika, Shinichi Murakami, Katsutaro Akamatsu
  • High corrosion resistant and high strength medium Cr and low Ni stainless cast steel
    Patent number: 4218268
    Abstract: A high corrosion resistant and high strength medium Cr and low Ni stainless cast steel which is produced from material including predetermined amounts of elements at predetermined weight percentage and remaining portion substantially of Fe. When the above material is further subjected to heat treatments under predetermined conditions, stainless steels superior in yield strength and having stable corrosion resistance against circumstances influenced by strong acids are presented.
    Type: Grant
    Filed: July 28, 1978
    Date of Patent: August 19, 1980
    Assignee: Kubota Ltd.
    Inventors: Hisashi Hiraishi, Toshiaki Morichika, Shinichi Murakami, Katsutaro Akamatsu
  • Method of producing stainless steel product
    Patent number: 4138279
    Abstract: A method of producing stainless steel products superior in intergranular corrosion resistance and applicable to ultrasonic flaw detection, in which austenite group stainless cast steel containing 5 to 40% of ferrite phase is employed as base material, part or all of which base material is subjected to plastic deformation or plastic processing such as pulling, pressing, bending, tension processing and the like, with subsequent recrystallizing heat treatment for the improvement of intergranular corrosion resistance by making its cast structure fine and reducing surface roughening developed due to deformation during the plastic processing, and for making it possible to successfully apply ultrasonic flaw detection to such cast steel products.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: February 6, 1979
    Assignee: Kubota, Ltd.
    Inventors: Shinichi Murakami, Katsutaro Akamatsu, Arata Yoshimitsu, Sueyoshi Noji
  • Heat resisting alloyed steel
    Patent number: 4050929
    Abstract: A heat resisting alloyed steel having a highly improved compressive strength at the elevated temperature within the range of 1,250.degree. to 1,300.degree. C. contains carbon, silicon, chromium, nickel, manganese, cobalt, molybdenum, phosphorus, sulfur, niobium and iron. Tungsten may be added as desired.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: September 27, 1977
    Assignee: Kubota, Ltd.
    Inventors: Shinichi Murakami, Katsutaro Akamatsu, Toshiaki Morichika, Hisashi Hiraishi
  • Alloyed steel
    Patent number: 4050927
    Abstract: An alloyed steel having high heat and wear resistance is disclosed. This alloyed steel contain carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, cobalt, tungsten, niobium and iron and other impurities as the remainder. A deoxidizing agent may be added.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: September 27, 1977
    Assignee: Kubota, Ltd.
    Inventors: Shinichi Murakami, Katsutaro Akamatsu, Hisashi Hiraishi