Patents by Inventor Tadamitu Nagayasu

Tadamitu Nagayasu 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).

  • Method for recovering zinc from substances containing a zinc compound
    Patent number: 4595574
    Abstract: A method for recovering zinc from substances containing a zinc compound which comprises supplying a carbonaceous substance and a zinc compound-containing substance onto the hearth layer in a sintering apparatus, vaporizing the zinc compound in said substance as metal to separate the compound therefrom by forming a locally strong reducing atmosphere at the combustion temperature of sintering material, oxidizing the resultant vapor-form zinc into zinc oxide under a strong oxidizing atmosphere, and then discharging the resultant zinc oxide as such from said sintering apparatus.
    Type: Grant
    Filed: January 25, 1985
    Date of Patent: June 17, 1986
    Assignee: Sumitomo Heavy Industries, Ltd.
    Inventors: Toshio Matsuoka, Shinichi Kurozu, Yukio Koyabu, Tadamitu Nagayasu, Seiji Sugimori