Patents by Inventor Seigo Tomaru

Seigo Tomaru 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).

  • Process for manufacture of high-chromium iron alloy
    Patent number: 4053307
    Abstract: Treatment, with quick lime, of a chromium ore of which the Cr/Fe weight ratio is not less than 1.6 produces a primary slag; reduction of the primary slag with a silicic reducing agent produces a secondary slag in conjunction with a by-produced metal; further reduction of the secondary slag gives rise to a tertiary slag in conjunction with a high-chromium iron alloy of which the combined content of chromium and iron is not less than 90% by weight and the Cr/Fe weight ratio is not less than 4.0; and, as occasion demands, silico-chromium is derived in conjunction with waste slag from the tertiary slag.
    Type: Grant
    Filed: January 16, 1976
    Date of Patent: October 11, 1977
    Assignee: Showa Denko K. K.
    Inventors: Tatsuo Kitayama, Fumihiko Kusama, Seigo Tomaru, Akira Ebinuma