Patents by Inventor Tatso Kawamura

Tatso Kawamura 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).

  • Electronic apparatus having conventional and battery power sources, and having a battery discharge mode wherein a first portion of the apparatus is powered by the conventional power source and a second portion of the apparatus is powered by the battery
    Patent number: 5754868
    Abstract: A data processing system that employs a rechargeable battery and supports a full discharge of the battery and that is not shut down even if a user mistakenly removes a battery while the system is being operated in a full discharge mode, and a power supply apparatus for such a data processing system and a method for using the apparatus. When a data processing system is to be operated in a full discharge mode, an external power source constantly and steadily supplies power to the first electric circuitry, while a battery supplies power to the second electric circuitry until the discharge is completed. The first electric circuitry is designed to include components, such as a CPU and a main memory, that may force the entire system to be shut down when the supply of power is abruptly halted to those components.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: May 19, 1998
    Assignee: International Business Machines Corp.
    Inventors: Hiroyuki Yamamoto, Tatso Kawamura