Patents by Inventor Keiki Kiyohara

Keiki Kiyohara 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).

  • Electroless plating bath composition and method for production thereof
    Patent number: 5183500
    Abstract: An electroless plating bath composition is produced by mixing stannous oxide, at least one member selected from the group consisting of lead oxide and lead perchlorate, perchloric acid, and thiourea. The composition thus obtained is ideal for electroless plating of a substrate of copper, particularly a substrate provided with a resist film.
    Type: Grant
    Filed: September 4, 1991
    Date of Patent: February 2, 1993
    Assignee: Kosaku & Co., Ltd.
    Inventors: Kazuhiro Fukuoka, Keiki Kiyohara, Tadayuki Konishi, Isao Miyatake, Masaji Hamamoto
  • Electroless Pb-Sn alloy plating bath composition
    Patent number: 5135574
    Abstract: An electroless Pb-Sn alloy plating bath composition is obtained by mixing at least one of methane sulfonic acid, 1-hydroxyethane-1, 1-diphosphoric acid and a salt of 1-hydroxyethane-1, 1-diposphoric acid, compounds for forming Pb-Sn alloy and a reducing agent.
    Type: Grant
    Filed: April 30, 1991
    Date of Patent: August 4, 1992
    Assignee: Kosaku & Co., Ltd.
    Inventors: Haruo Konishi, Kazuhiro Fukuoka, Keiki Kiyohara, Saburo Yonekura, Isao Miyatake