Patents by Inventor Hirohiko Iwasaka

Hirohiko Iwasaka 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).

  • Sodium-sulfur cell and method of joining solid electrolyte tube and insulative ring
    Patent number: 5196277
    Abstract: An excellent stable sodium-sulfur cell having a high mechanical strength and a very long life is provided. The cell eliminates formation of cracks in a joining portion of the solid electrolyte tube and the insulative ring of the cell with the aid of a solder glass filled in a gap between the solid electrolyte tube and the insulative ring, preferably with the aid of a tapered portion formed at at least one of the solid electrolyte tube and the insulative ring, thereby to completely obviate a direct reaction of active substances of the positive electrode and the negative electrode, overheating and destruction of the cell. The sodium-sulfur cell, includes a solid electrolyte tube, an insulative ring, a gap of 100-500 .mu.m formed between the solid electrolyte tube and the insulative ring, and a solder glass filled in the gap for joining the insulative ring to the solid electrolyte tube.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: March 23, 1993
    Assignee: NGK Insulators, Ltd.
    Inventors: Toshiyuki Mima, Michimasa Fujii, Hirohiko Iwasaka