Patents by Inventor Hirofumi Isoyama

Hirofumi Isoyama 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).

  • Patent number: 6093503
    Abstract: A device for protecting a cell is described comprising a cell body arranged in a container which has opening and closing means to open and close the cell body from the exterior atmosphere of the container. The device also has a sensor for sensing an impact to the cell body. When the impact is above a predetermined value, a barrier fluid is sprayed into the interior of the container. The opening and closing means of the container is operated in response to the spraying of the barrier fluid.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: July 25, 2000
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hirofumi Isoyama, Hisanao Kojima, Satoru Suzuki, Jun Hasegawa
  • Patent number: 5494762
    Abstract: In order to improve the charge-discharge energy density of a lithium secondary cell with a nonaqueous electrolyte having such a construction that a metallic compound capable of occluding or releasing lithium is used as an electrode active material, lithium or a lithium alloy is used as a negative electrode material and a solution of a lithium salt is used as an electrolyte, the microstructure of the metallic compound is rendered acicular. Further, a lithium-containing metallic compound grown into such a columnar form that has the angle .THETA. to the normal of the surface of the substrate of< is used as the electrode active material.
    Type: Grant
    Filed: February 9, 1995
    Date of Patent: February 27, 1996
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hirofumi Isoyama, Satoru Suzuki, Jun Hasegawa, Hirohiko Saito, Hisano Kojima