Patents by Inventor Kyoko Ikawa
Kyoko Ikawa 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).
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Publication number: 20010020927Abstract: A system using a secondary cell having at least one of a heat source, motor, controlling circuit, driving circuit, LSI, IC and display element, each having a capacity of 0.5 to 50 kWh, and secondary cells, wherein at least one of the secondary cells includes a positive electrode and a negative electrode and has a discharge time of at least 15 minutes at a discharge of 580 W/l or more, and at least one of the positive electrode and the negative electrode containing a particle with cracks.Type: ApplicationFiled: February 16, 2001Publication date: September 13, 2001Inventors: Kyoko Ikawa, Yasushi Muranaka, Yosimi Komatu, Tatsuo Horiba, Yoshiro Mikami
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Patent number: 6034507Abstract: The present invention provides a distributed secondary battery type power storage system capable of maintaining the soundness of the secondary battery and of efficient electric power charging and discharging operations. The secondary battery power storage system comprises a secondary battery connected to a load, a charge/discharge unit connectable to a power system and connected to the secondary battery, and a plurality of loads connected to the charge/discharge unit. A power receiving object is selected and a capacity is determined on the basis of information about the operating condition of the plurality of loads, and the surplus electric power remaining in the secondary battery after feeding electric power from the secondary battery to the load is fed to the selected power receiving object through the charge/discharge unit. The secondary battery power storage system is capable of maintaining the soundness of the secondary battery and of efficient charging and discharging operation.Type: GrantFiled: August 14, 1998Date of Patent: March 7, 2000Assignee: Hitachi, Ltd.Inventors: Kyoko Ikawa, Tatsuo Horiba
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Patent number: 5922491Abstract: A secondary battery having a large capacity, and a preferable characteristics in both rapid charging and rapid discharging comprises a positive electrode a negative electrode, and an electrolyte which separates said electrodes, in which any one of the positive electrode or negative electrode contains particles composed of a material contributing to a charge-discharge reaction, and the particles comprise at least two phases and fine pores which are formed by dissolving at least one of the phases.Type: GrantFiled: June 6, 1996Date of Patent: July 13, 1999Assignees: Hitachi, Ltd., Hitachi Chemical Co., Ltd.Inventors: Kyoko Ikawa, Yasushi Muranaka, Tatsuo Horiba, Yosimi Komatu
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Patent number: 5834922Abstract: The present invention provides a distributed secondary battery type power storage system capable of maintaining the soundness of the secondary battery and of efficient electric power charging and discharging operations. The secondary battery power storage system comprises a secondary battery connected to a load, a charge/discharge unit connectable to a power system and connected to the secondary battery, and a plurality of loads connected to the charge/discharge unit. A power receiving object is selected and a capacity is determined on the basis of information about the operating condition of the plurality of loads, and the surplus electric power remaining in the secondary battery after feeding electric power from the secondary battery to the load is fed to the selected power receiving object through the charge/discharge unit. The secondary battery power storage system is capable of maintaining the soundness of the secondary battery and of efficient charging and discharging operation.Type: GrantFiled: February 23, 1996Date of Patent: November 10, 1998Assignee: Hitachi, Ltd.Inventors: Kyoko Ikawa, Tatsuo Horiba
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Patent number: 5537390Abstract: A secondary battery control device includes a secondary battery section, a current converting section for converting current inputted or outputted to the secondary battery section from direct current to alternating current or vice versa, and a charge and discharge control section for controlling an input and an output as monitoring the state of the secondary battery section. The secondary battery control device is characterized in that the secondary battery section is arranged to have a main battery, an auxiliary battery connected in parallel to the main battery, an operating section for operating a residual capacity of the main battery by detecting a voltage of the auxiliary battery, and an indicator for indicating the residual capacity outputted from the operating section.Type: GrantFiled: August 24, 1993Date of Patent: July 16, 1996Assignee: Hitachi, Ltd.Inventors: Tatsuo Horiba, Kyoko Ikawa, Mamoru Mizumoto
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Patent number: RE37678Abstract: The present invention provides a distributed secondary battery type power storage system capable of maintaining the soundness of the secondary battery and of efficient electric power charging and discharging operations. The secondary battery power storage system comprises a secondary battery connected to a load, a charge/discharge unit connectable to a power system and connected to the secondary battery, and a plurality of loads connected to the charge/discharge unit. A power receiving object is selected and a capacity is determined on the basis of information about the operating condition of the plurality of loads, and the surplus electric power remaining in the secondary battery feeding electric power from the secondary battery to the load is fed to the selected power receiving object through the charge/discharge unit. The secondary battery power storage system is capable of maintaining the soundness of the secondary battery and of efficient charging and discharging operation.Type: GrantFiled: November 9, 2000Date of Patent: April 30, 2002Assignee: Hitachi, Ltd.Inventors: Kyoko Ikawa, Tatsuo Horiba
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Patent number: RE39749Abstract: The present invention provides a distributed secondary battery type power storage system capable of maintaining the soundness of the secondary battery and of efficient electric power charging and discharging operations. The secondary battery power storage system comprises a secondary battery connected to a load, a charge/discharge unit connectable to a power system and connected to the secondary battery, and a plurality of loads connected to the charge/discharge unit. A power receiving object is selected and a capacity is determined on the basis of information about the operating condition of the plurality of loads, and the surplus electric power remaining in the secondary battery after feeding electric power from the secondary battery to the load is fed to the selected power receiving object through the charge/discharge unit. The secondary battery power storage system is capable of maintaining the soundness of the secondary battery and of efficient charging and discharging operation.Type: GrantFiled: March 6, 2002Date of Patent: July 31, 2007Assignee: Hitachi, Ltd.Inventors: Kyoko Ikawa, Tatsuo Horiba
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Patent number: RE39908Abstract: The present invention provides a distributed secondary battery type power storage system capable of maintaining the soundness of the secondary battery and of efficient electric power charging and discharging operations. The secondary battery power storage system comprises a secondary battery connected to a load, a charge/discharge unit connectable to a power system and connected to the secondary battery, and a plurality of loads connected to the charge/discharge unit. A power receiving object is selected and a capacity is determined on the basis of information about the operating condition of the plurality of loads, and the surplus electric power remaining in the secondary battery after feeding electric power from the secondary battery to the load is fed to the selected power receiving object through the charge/discharge unit. The secondary battery power storage system is capable of maintaining the soundness of the secondary battery and of efficient charging and discharging operation.Type: GrantFiled: March 6, 2002Date of Patent: November 6, 2007Assignee: Hitachi, Ltd.Inventors: Kyoko Ikawa, Tatsuo Horiba