Patents by Inventor Keiji Ishihama

Keiji Ishihama 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).

  • Battery pack
    Patent number: 6492058
    Abstract: The battery pack houses a protection circuit along with a rechargeable cell in a case. The protection circuit is provided with switching devices to control current flow in the rechargeable cell, and a control circuit to control the switching devices. The protection circuit is molded in a single package with insulating material to make a one-package unit. The one-package unit is retained in a holding space in an insulating holder. The one-package unit, insulating holder, and rechargeable cell are held in the case.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: December 10, 2002
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Atsushi Watanabe, Yasushi Inoue, Ryosuke Kubo, Keiji Ishihama, Yasuhiro Yamagami, Takuya Matsuda, Mikitaka Tamai