Patents by Inventor Tadamichi Sakai

Tadamichi Sakai 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).

  • Low alloy steels for use in pressure vessel
    Patent number: 4855106
    Abstract: Low alloy steels for use in pressure vessel comprising on the weight % basis:C: from 0.05% to 0.30%,Si: less than 0.10%,Mn: from 0.3% to 1.5%,Ni: from inevitably incorporated content to 0.55%,Cr: from 1.5% to 5.5%,Mo: from 0.25% to 1.5%,V: in excess of 0.10% and less than 0.6%, andthe balance of iron and inevitably incorporated impurities.The steels are excellent in hardenability, the hot strength, toughness weldability and hydrogen attack and embrittlement resistance, as well as show excellent toughness after the use in the temper brittle temperature region.
    Type: Grant
    Filed: September 15, 1987
    Date of Patent: August 8, 1989
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Masaaki Katsumata, Isamu Takagi, Eiji Takahashi, Tadamichi Sakai, Yoji Matsumoto, Hideaki Ohtsu, Hiroyuki Uchida, Kiyoshi Asami