Patents by Inventor Sonae Kirihara

Sonae Kirihara 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).

  • Leak-proof alkaline cell and its production
    Patent number: 4238555
    Abstract: A leak-proof alkaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can and the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with a copper layer which is adapted to be contacted with a negative electrode active material mix and the copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of the turned-up portion.
    Type: Grant
    Filed: July 10, 1979
    Date of Patent: December 9, 1980
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Yoshio Uetani, Yasuyoshi Taniguchi, Kenichi Yokoyama, Seiichi Matsushima, Sonae Kirihara