Patents by Inventor Toshihiko Izumikawa

Toshihiko Izumikawa 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).

  • Coin-shaped battery
    Patent number: 6761995
    Abstract: A coin-shaped battery includes a cathode case (1) having a crimp portion (14) in the periphery of a bottom face (1a), and an anode cap (2) having a flange (6) with an extended portion (7) and a turn-up portion (8). Openings of cathode case (1) and the anode cap (2) are sealed by crimping with a gasket (3) interposed therebetween, so that the gasket (3) is compressed between the crimp portion (14) having a U-shaped cross section, the flange (6), the extended portion (7) and the turn-up portion (8) to effect reliable sealing. Thus, it is possible to disperse a deformation pressure, which is generated by bulge of the cathode case (1) and the anode cap (2) caused with a rise in internal pressure of the battery under severe working conditions such as use under a high temperature. As a result, the coin-shaped battery having improved liquid leakage resistance in the crimped portion is provided.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: July 13, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takao Uyama, Daisuke Yoshida, Toshihiko Izumikawa, Yasushi Hirakawa, Susumu Yamanaka
  • Coin-shaped battery
    Publication number: 20030186118
    Abstract: A coin-shaped battery includes a cathode case (1) having a crimp portion (14) in the periphery of a bottom face (1a), and an anode cap (2) having a flange (6) with an extended portion (7) and a turn-up portion (8). Openings of cathode case (1) and the anode cap (2) are sealed by crimping with a gasket (3) interposed therebetween, so that the gasket (3) is compressed between the crimp portion (14) having a U-shaped cross section, the flange (6), the extended portion (7) and the turn-up portion (8) to effect reliable sealing. Thus, it is possible to disperse a deformation pressure, which is generated by bulge of the cathode case (1) and the anode cap (2) caused with a rise in internal pressure of the battery under severe working conditions such as use under a high temperature. As a result, the coin-shaped battery having improved liquid leakage resistance in the crimped portion is provided.
    Type: Application
    Filed: January 17, 2003
    Publication date: October 2, 2003
    Inventors: Takao Uyama, Daisuke Yoshida, Toshihiko Izumikawa, Yasushi Hirakawa, Susumu Yamanaka