Patents by Inventor Tuyoshi Otomo

Tuyoshi Otomo 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).

  • Ferritic precipitation-hardened soft magnetic stainless steel
    Patent number: 4264356
    Abstract: A ferritic precipitation-hardened soft magnetic stainless steel is disclosed. This steel consists by weight percentage of not more than 0.1% of C, 12.0-22.0% of Cr, 1.5-6.0% of Nb, at least one of Al and Ti, provided that an amount of Al used alone is 0.5-4.0%, an amount of Ti used alone is 0.5-3.0% and an amount of Al and Ti used together is 0.5-4.0% (in the latter case, the amount of Ti does not exceed 3.0%), the remainder being Fe and incidental impurities. The steel exhibits substantially 100% ferrite phase after solution heat- and aging-treatments and has improved magnetic properties, corrosion resistance and hardness.
    Type: Grant
    Filed: March 23, 1979
    Date of Patent: April 28, 1981
    Assignee: Tohoku Special Steel Works Limited
    Inventors: Susumu Shinagawa, Taizo Suzuki, Tuyoshi Otomo