Patents by Inventor Yusai Murakami

Yusai Murakami 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 determining an end of discharge voltage for a secondary battery
    Patent number: 6265877
    Abstract: Method for determining a determination voltage (end of discharge voltage) of a secondary battery having a nickel-hydroxide positive electrode based on the state of charge of the battery. The end of discharge voltage is determined in consideration of the voltages when the state of charge reaches a permissible lower limit after first and subsequent discharges of the battery. The voltage at which the state of charge reaches the lower limit for discharges after the first discharge gradually decreases due to a memory effect. As a result, the end of discharge voltage is lower than the voltage at which the state of charge reaches the lower limit after the first discharge.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: July 24, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadao Kimura, Yusai Murakami, Masaru Yonemoto, Toshiaki Nakanishi