Patents by Inventor Osamu Aritomi

Osamu Aritomi 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).

  • Dual phase stainless steel suitable for use in sour wells
    Patent number: 4486231
    Abstract: Disclosed herein is a dual phase stainless steel suitable for use in sour wells. It comprises 0.06-0.20% C, .ltoreq.1.0% Si, 2.5-4% Mn, 20-27% Cr, 5-8% Ni, 2.5-4% Mo, 0.3-2% Cu, 0.1-0.25% N, 40-60% ferrite and the balance Fe and inevitable impurities. It may further contain one or more metals selected from Ti, Nb and V in a total amount of 0.1% to 0.5%. The dual phase stainless steel is excellent in proof strength, tensile strength and elongation and is capable of exhibiting good corrosion resistance in Cl.sup.- --CO.sub.2 --H.sub.2 S environments.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: December 4, 1984
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Kazuo Fujiwara, Haruo Tomari, Osamu Aritomi, Nobuhiro Sato