Patents by Inventor Michio Hirota

Michio Hirota 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 and power tool using the same
    Patent number: 6692864
    Abstract: A battery pack suppresses temperature rise of secondary battery during charging and discharging. The battery pack includes a plurality of batteries stacked up, a case enclosing the plurality of batteries, a heat collector disposed near the battery positioned in the center of the plurality of batteries, a heat radiator placed at one side of the case, and a first heat transfer unit placed for connecting the heat collector and heat radiator. Further, the battery pack includes a heat transfer plate placed at the other side of the case, and a second heat transfer unit placed between the heat collector and heat transfer plate.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: February 17, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshitaka Dansui, Hironori Ura, Sadaaki Yokoo, Michio Hirota