Patents by Inventor Hiromitsu YATSUHASHI

Hiromitsu YATSUHASHI 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).

  • Patent number: 11866802
    Abstract: A method for recovering platinum group metals, includes melting a material to be treated containing platinum group metals, under heating in a furnace, along with a copper source material containing at least one kind of metallic copper and copper oxide, a flux component, and a reducing agent. The molten metal absorbing the platinum group metals is separated from a slag oxide through difference in specific gravity. The molten metal absorbing the platinum group metals is subjected to an oxidation treatment. An oxide layer containing as a major component copper oxide and a molten metal containing as a major component metallic copper containing the platinum group metals concentrated therein are separated through difference in specific gravity. A silver content in the molten metal separated in melting under heating is controlled to 2,000 ppm or more and 8,000 ppm or less, thereby recovering platinum group metals with high efficiency.
    Type: Grant
    Filed: December 22, 2021
    Date of Patent: January 9, 2024
    Assignee: DOWA METALS & MINING CO., LTD.
    Inventors: Minoru Kawasaki, Hiromitsu Yatsuhashi, Nobuaki Kita
  • Publication number: 20230045764
    Abstract: A method for recovering platinum group metals, includes melting a material to be treated containing platinum group metals, under heating in a furnace, along with a copper source material containing at least one kind of metallic copper and copper oxide, a flux component, and a reducing agent. The molten metal absorbing the platinum group metals is separated from a slag oxide through difference in specific gravity. The molten metal absorbing the platinum group metals is subjected to an oxidation treatment. An oxide layer containing as a major component copper oxide and a molten metal containing as a major component metallic copper containing the platinum group metals concentrated therein are separated through difference in specific gravity. A silver content in the molten metal separated in melting under heating is controlled to 2,000 ppm or more and 8,000 ppm or less, thereby recovering platinum group metals with high efficiency.
    Type: Application
    Filed: December 22, 2021
    Publication date: February 9, 2023
    Inventors: Minoru KAWASAKI, Hiromitsu Yatsuhashi, Nobuaki Kita
  • Publication number: 20220259697
    Abstract: There is provided a method for recovering PGM, in which at least one base metal oxide selected from a group consisting of copper oxide, iron oxide, tin oxide, nickel oxide and lead oxide is added to and melted in a molten slag, and a PGM alloy contained in the molten slag is recovered.
    Type: Application
    Filed: July 6, 2020
    Publication date: August 18, 2022
    Applicants: WASEDA UNIVERSITY, DOWA METALS & MINING CO., LTD., NIPPON PGM CO., LTD.
    Inventors: Keiichi SUGAWARA, Hiromitsu YATSUHASHI, Katsunori YAMAGUCHI, Takashi MURATA