Patents by Inventor Toru Mizuta

Toru Mizuta 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).

  • Power source apparatus for an electric automobile
    Patent number: 6943525
    Abstract: A power source apparatus for an electric automobile is provided with a battery system, having a driving battery to power an automobile driving motor and a battery control circuit to control driving battery charging and discharging as well as to compute driving battery remaining capacity, and an accessory battery to power automobile electrical accessories. When the automobile is in the stationary state a, charging circuit, which controls charging between the driving battery and accessory battery, charges the driving battery to a specified state with accessory battery power. The battery control circuit corrects the value of driving battery remaining capacity to a specified battery capacity, and subsequently charges the accessory battery with the driving battery to bring driving battery remaining capacity to a specified level.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: September 13, 2005
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Shoichi Toya, Kuniho Tanaka, Toru Mizuta, Hiroshi Tatsumi, Masato Takami
  • Method and apparatus for indicating battery state of hybrid car
    Patent number: 6784640
    Abstract: The present method for indicating a battery state of a hybrid car detects &Dgr;V/&Dgr;I which is a change value of voltage and current from a first state and a second state of a battery 1 being charged/discharged. The battery state indicating method determines whether the battery is charged/discharged in a battery protective state based on the &Dgr;V/&Dgr;I and indicates that the battery protective state is established when the battery is charged/discharged in a protective state.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: August 31, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Toru Mizuta, Kenichi Tanimoto
  • Power source apparatus for an electric automobile
    Publication number: 20030173932
    Abstract: The power source apparatus for an electric automobile is provided with a battery system, having a driving battery to power an automobile driving motor and a battery control circuit to control driving battery charging and discharging as well as to compute driving battery remaining capacity, and an accessory battery to power automobile electrical accessories. When the automobile is in the stationary state, a charging circuit, which controls charging between the driving battery and accessory battery, charges the driving battery to a specified state with accessory battery power. The battery control circuit corrects the value of driving battery remaining capacity to a specified battery capacity, and subsequently charges the accessory battery with the driving battery to bring driving battery remaining capacity to a specified level.
    Type: Application
    Filed: February 25, 2003
    Publication date: September 18, 2003
    Inventors: Shoichi Toya, Kuniho Tanaka, Toru Mizuta, Hiroshi Tatsumi, Masato Takami
  • Method and apparatus for indicating battery state of hybrid car
    Publication number: 20030155810
    Abstract: The present method for indicating a battery state of a hybrid car detects &Dgr;V/&Dgr;I which is a change value of voltage and current from a first state and a second state of a battery 1 being charged/discharged. The battery state indicating method determines whether the battery is charged/discharged in a battery protective state based on the &Dgr;V/&Dgr;I and indicates that the battery protective state is established when the battery is charged/discharged in a protective state.
    Type: Application
    Filed: February 19, 2003
    Publication date: August 21, 2003
    Inventors: Toru Mizuta, Kenichi Tanimoto