Patents by Inventor Kumpei Tanaka

Kumpei Tanaka 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 of recycling useful metal
    Patent number: 8317896
    Abstract: A method of recycling useful metals is provided. The method enables useful metals including indium, zinc, yttrium, europium, lanthanum, terbium, gadolinium, antimony, lead, copper, tin, and silver to be recovered from wastes, such as wasted flat panel displays, and recycled economically with small energy consumption. The method of recycling useful metals includes: a step in which wastes comprising various flat panel displays, e.g., liquid-crystal display panels, are crushed/powdered; a step in which the resultant particles are dissolved in an aqueous hydrofluoric acid solution; and a step in which various metal oxides and various metal fluorides which remain undissolved are filtered off and the aqueous hydrofluoric acid solution containing various metal ions is electrolyzed to deposit and recover metals for transparent-electrode oxides, such as indium and zinc, and other useful metals.
    Type: Grant
    Filed: December 25, 2008
    Date of Patent: November 27, 2012
    Assignee: Shibaura Institute of Technology
    Inventors: Tetsuya Homma, Tomoyuki Ubusawa, Tomoyuki Furuyama, Akihiro Morikaku, Kumpei Tanaka
  • METHOD OF RECYCLING USEFUL METAL
    Publication number: 20110017020
    Abstract: A method of recycling useful metals is provided. The method enables useful metals including indium, zinc, yttrium, europium, lanthanum, terbium, gadolinium, antimony, lead, copper, tin, and silver to be recovered from wastes, such as wasted flat panel displays, and recycled economically with small energy consumption. The method of recycling useful metals includes: a step in which wastes comprising various flat panel displays, e.g., liquid-crystal display panels, are crushed/powdered; a step in which the resultant particles are dissolved in an aqueous hydrofluoric acid solution; and a step in which various metal oxides and various metal fluorides which remain undissolved are filtered off and the aqueous hydrofluoric acid solution containing various metal ions is electrolyzed to deposit and recover metals for transparent-electrode oxides, such as indium and zinc, and other useful metals.
    Type: Application
    Filed: December 25, 2008
    Publication date: January 27, 2011
    Applicant: SHIBAURA INSTITUTE OF TECHNOLOGY
    Inventors: Tetsuya Homma, Tomoyuki Ubusawa, Tomoyuki Furuyama, Akihiro Morikaku, Kumpei Tanaka