Patents by Inventor Tamimi Nagai

Tamimi Nagai 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 a secondary battery and charger used therefor using constant current and constant voltage
    Patent number: 5637981
    Abstract: A secondary battery charging method and a charger used therefor, in which the method uses a constant current and a constant voltage such that the secondary battery is first charged with the constant current until the terminal voltage of the battery becomes a reference voltage higher than the full charging voltage for the battery and then further charged with the constant voltage which is equal to the full charging voltage. These two charging operations are switched by using various kinds of detection and control circuits, so that the secondary battery is properly charged in a short time. Further, the charger of the present invention is provided with a circuit for charging a plurality of battery cells simultaneously or separately.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: June 10, 1997
    Assignee: Sony Corporation
    Inventors: Tamimi Nagai, Hitoshi Akiho
  • Method for charging secondary battery and charger used therefor
    Patent number: 5576608
    Abstract: A secondary battery charging method and a charger used therefor, in which the method uses a constant current and a constant voltage such that the secondary battery is first charged with the constant current until the terminal voltage of the battery becomes a reference voltage higher than the full charging voltage for the battery and then further charged with the constant voltage which is equal to the full charging voltage. These two charging operations are switched by using various kinds of detection and control circuits so that the secondary battery is properly charged in a short time. Further, the charger of the present invention is provided with a circuit for charging a plurality of battery cells simultaneously or separately.
    Type: Grant
    Filed: May 3, 1994
    Date of Patent: November 19, 1996
    Assignee: Sony Corporation
    Inventors: Tamimi Nagai, Hitoshi Akiho