Patents by Inventor Masahito Ishiwata

Masahito Ishiwata 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).

  • Method for charging secondary battery
    Patent number: 6275006
    Abstract: A method for charging a secondary battery by measuring the static/open circuit voltage and comparing it to a predetermined value includes: a first step of precharging the secondary battery; thereafter pausing a predetermined interval; a step of measuring a secondary battery voltage Vba1 after performing the pausing; and a step of charging the secondary battery based on the measurement of the secondary battery voltage Vba1.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: August 14, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiichi Koike, Harumi Murochi, Masahito Ishiwata, Hiroyuki Jimbo, Norio Saito
  • Method for charging secondary battery
    Patent number: RE40223
    Abstract: A method for charging a secondary battery by measuring the static/open circuit voltage and comparing it to a predetermined value includes: a first step of precharging the secondary battery; thereafter pausing a predetermined interval; a step of measuring a secondary battery voltage Vba1 after performing the pausing; and a step of charging the secondary battery based on the measurement of the secondary battery voltage Vba1.
    Type: Grant
    Filed: August 12, 2003
    Date of Patent: April 8, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiichi Koike, Harumi Murochi, Masahito Ishiwata, Hiroyuki Jimbo, Norio Saito