Patents by Inventor Junzo Nakagawa

Junzo Nakagawa 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 preparing non-amalgamated zinc alloy powder for alkali dry cells
    Patent number: 5296267
    Abstract: Non-amalgamated zinc alloy powder is prepared by admixing zinc alloy powder with a predetermined amount of indium and heating the resulting mixture at temperature ranging from 160.degree. C. to 200.degree. C. in inert gas atmosphere.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: March 22, 1994
    Assignees: Toho-Aen Kabushikigaisha, Sanyo-Ekuseru Kabushikigaisha, Sanyo-Denki Kabushikigaisha
    Inventors: Kinya Tada, Masaaki Kurimura, Mutsumi Yano, Eiichiro Mieno, Wataru Sekiguchi, Junzo Nakagawa, Takanori Akazawa
  • Zinc alkaline cells
    Patent number: 5209995
    Abstract: A zinc alkaline cell is formed by using an anode active material which contains a non-amalgamated zinc alloy powder having a bulk specific gravity ranging from approximately 2.90 to 3.50 (grams per cm.sup.3) and containing a predetermined amount of indium coated on a surface of the non-amalgamated zinc alloy powder containing a predetermined amount of aluminum and/or a predetermined amount of calcium as a zinc alloy powder component, other than unavoidable impurities. The zinc alkaline cell can achieve corrosive resistance and discharge performance as a cell and it is comparable with cells formed by using amalgamated zinc alloy powder which has been practically employed.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: May 11, 1993
    Assignees: Sanyo-Denki Kabushikigaisha, Sanyo-Ekuseru Kabushikigaisha, Toho-Aen Kanushikigaisha
    Inventors: Kinya Tada, Masaaki Kurimura, Mutsumi Yano, Eiichiro Mieno, Wataru Sekiguchi, Junzo Nakagawa, Takanori Akazawa
  • Zinc alkaline cells
    Patent number: 5198315
    Abstract: A zinc alkaline cell is formed by using an anode active material which contains a non-amalgamated zinc alloy powder having a bulk specific gravity ranging from approximately 2.90 to 3.50 (grams per cm.sup.3) and containing a predetermined amount of indium coated on a surface of the non-amalgamated zinc alloy powder containing a predetermined amount of lead or a predetermined amount of a mixture of lead with bismuth or aluminum as a zinc alloy powder component, other than unavoidable impurities. The zinc alkaline cell can achieve corrosive resistance and discharge performance as a cell and it is comparable with cells formed by using amalgamated zinc alloy powder which has been practically employed.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: March 30, 1993
    Assignees: Sanyo-Ekuseru Kabushikigaisha, Toho-Aen Kabushikigaisha, Sanyo-Denki Kabushikigaisha
    Inventors: Kinya Tada, Masaaki Kurimura, Mutsumi Yano, Eiichiro Mieno, Wataru Sekiguchi, Junzo Nakagawa, Takanori Akazawa
  • Zinc alkaline cells
    Patent number: 5139900
    Abstract: A zinc alkaline cell is formed by using an anode active material which contains a non-amalgamated zinc alloy powder having a bulk specific gravity ranging from approximately 2.90 to 3.50 (grams per cm.sup.3) and containing a predetermined amount of indium coated on a surface of the non-amalgamated zinc alloy powder containing a predetermined amount of lead and calcium or a predetermined amount of calcium and bismuth as a zinc alloy powder component, other than unavoidable impurities. The zinc alkali cell can achieve corrosive resistance and discharge performance as a cell and it is comparable with cells formed by using amalgamated zinc alloy powder which has been practically employed.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: August 18, 1992
    Assignees: Sanyo-Denki Kabushikigaisha, Sanyo-Ekuseru Kabushikigaisha, Toho-Aen Kabushikigaisha
    Inventors: Kinya Tada, Masaaki Kurimura, Mutsumi Yano, Eiichiro Mieno, Wataru Sekiguchi, Junzo Nakagawa, Takanori Akazawa
  • Zinc alloy for use with electrode
    Patent number: 4432937
    Abstract: An alloy comprising more than 0.01% of gallium and more than 0.01% of indium added to zinc which is usable, as conventional zinc dust or zinc can, for the electrode of a dry cell and shows a high hydrogen overvoltage and evolves less hydrogen gas during storage of the cell.
    Type: Grant
    Filed: August 4, 1982
    Date of Patent: February 21, 1984
    Assignee: Toho Aen Kabushiki Kaisha
    Inventors: Kenta Kuwayama, Junzo Nakagawa, Keishi Tomii, Kenji Hagimori