Patents by Inventor Noboru Tsurukawa

Noboru Tsurukawa 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 power unit with a battery and a compensator for calculating the actual charge capacity of the battery
    Patent number: 6910143
    Abstract: A main battery used as an electric power unit for a computer is provided with a memory that stores capacity information denoting the total capacity of a battery and compensation information representing the total capacity of the battery as a function of a battery charging cycle count. A CPU detects a cycle count of the battery according to an integrated charged capacity of the battery, thereby obtaining the total capacity with respect to this cycle count from the compensation information so as to compensate the capacity information according to the obtained total capacity.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: June 21, 2005
    Assignee: International Business Machines Corporation
    Inventors: Shigefumi Odaohhara, Noboru Tsurukawa
  • Power supply unit, battery electrical apparatus, and memory effect detection method
    Patent number: 6518730
    Abstract: A power supply unit includes a rechargeable battery for supplying power to a body circuit of an electrical apparatus, a current measurement circuit for measuring a currently-discharged current value, a voltage measurement circuit for measuring a currently-discharged voltage value, and a controller for detecting whether a memory effect occurs by determining whether a currently-discharged voltage value measured at a currently-discharged current value is lower than a predetermined voltage value when a detected battery capacity is equal to or less than a predetermined capacity.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: February 11, 2003
    Assignee: International Business Machines Corporation
    Inventors: Hiroshi Nakagawa, Tomonori Nishio, Shigefumi Odaohhara, Noboru Tsurukawa
  • Power supply unit, battery, electrical apparatus, and memory effect detection method
    Publication number: 20020021110
    Abstract: A power supply unit includes a rechargeable battery for supplying power to a body circuit of an electrical apparatus, a current measurement circuit for measuring a currently-discharged current value, a voltage measurement circuit for measuring a currently-discharged voltage value, and a controller for detecting whether a memory effect occurs by determining whether a currently-discharged voltage value measured at a currently-discharged current value is lower than a predetermined voltage value when a detected battery capacity is equal to or less than a predetermined capacity.
    Type: Application
    Filed: August 14, 2001
    Publication date: February 21, 2002
    Applicant: International Business Machines Corporation
    Inventors: Hiroshi Nakagawa, Tomonori Nishio, Shigefumi Odaohhara, Noboru Tsurukawa
  • Power supply for electronic device, and electronic device system
    Patent number: 5465039
    Abstract: To make it possible to supply to a battery a charging current having a sufficient capacity which enables a short-time charge while supplying a drive current for usual operation to a battery operable electronic device, without making construction large-sized and complicated.The present invention is intended to be able to delicately vary a charging current of a battery according to the variation of power consumption of load on an electronic device, by providing constant power feedback control means for performing feedback control of the outputted power so as to cause a constant power or a nearly constant power, based on a current feedback value and a voltage feedback value.
    Type: Grant
    Filed: September 9, 1993
    Date of Patent: November 7, 1995
    Assignee: International Business Machines Corporation
    Inventors: Izuru Narita, Keiji Suzuki, Toshitsugu Mito, Noboru Tsurukawa