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Inventor

Tamiji Nagai

Inventor
Kanagawa, JP

Overview

40→
Patents
1977–2013
Patent span
Electricity
Primary field (CPC H)

Patents· 40 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H02Jprimary
H02JElectric power networks26%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems12%
Y02BClimate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications12%
Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution12%
H01MProcesses or means, e.g. batteries, for the direct conversion of chemical energy into electrical energy11%
G01RMeasuring electric variables5%
H03KPulse technique4%
H04NPictorial communication, e.g. television4%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests2%
G01WMeteorology1%
PatentTitleYear
8,610,405'Charge and discharge circuit of secondary battery and battery pack'20138,098,056'Bidirectional converter and electronic device'20127,830,675'Switching power supply device and method of starting the same'20107,436,644'Switching circuit, switching method, protective device and battery pack'20087,202,633'Driving circuit for field effect transistor'20077,193,390'Apparatus for connecting secondary battery cells in series and method for controlling secondary battery cells connected in series'20077,023,179'Charging apparatus and charging method'20067,023,180'Charging apparatus and method for a secondary battery of a portably electronic device'20066,961,255'Switching power supply using controlled negative feedback in series with a switching device and responsive to the voltage and/or current to a load'20056,956,357'Charging apparatus and charging method'20056,956,754'Switching power supply using controlled negative feedback in series with a switching device and responsive to the voltage and/or current to a load'20056,949,913'Charging apparatus and charging method'20056,917,530'Switching power supply using controlled negative feedback in series with a switching device and responsive to the voltage and or current to a load'20056,650,090'Battery pack and signal transmission system'20036,552,562'Current detecting apparatus and its control method'20036,465,913'Power source unit'20026,462,972'Power source apparatus for providing a power source in a standby mode and a pulse generating apparatus'20026,452,820'Power supplying apparatus and method having a primary side insulated from a secondary side'20026,373,724'Power supply apparatus'20026,326,768'Method, apparatus and battery pack for charging and discharging secondary batteries'20016,291,965'Battery charger'20016,169,341'Power supplying adapter, electronic equipment, and signal transmission system'20016,124,700'Charging method, charging equipment, and integrated circuit'20006,118,255'Charging apparatus, secondary battery apparatus, charging system, and charging method'20006,066,939'Secondary battery pack'20006,057,609'Auxiliary power supply apparatus'20006,028,415'Charging control method and charging control device'20005,991,170'Equipment and method for transmitting electric power'19995,982,153'Charger system switchably connects a smoothing capacitor and resistor and charging controller based on a detected secondary battery voltage'19995,982,151'Battery charger and battery charging method'19995,796,238'Battery pack'19985,783,322'Secondary battery pack'19985,760,570'Rechargeable battery apparatus'19985,691,620'Battery charging method'19975,680,027'Battery pack including internal capacity monitor for monitoring groups of battery cells'19974,393,337'Switching circuit'19834,390,818'Television receiver'19834,242,714'Current control circuit'19804,206,388'Current control circuit for horizontal deflection coil of television receiver'19804,027,200'High voltage generating circuit'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–2008Patents assigned to SONY CORP (37)· patent assignee history
1977–2013Based in Kawasaki, JP· patent location history
1997–2008Based in Kanagawa, JP· patent location history
2000Based in Kangawa, JP· patent location history
2010–2013Patents assigned to MITSUMI ELECTRIC CO LTD (3)· patent assignee history
2010Based in Atsugi, JP· patent location history
2012–2013Patents assigned to TANAKA HIDENORI (2)· patent assignee history
2012–2013Patents assigned to TERADA YUKIHIRO (2)· patent assignee history
2012–2013Patents assigned to YAMAZAKI KAZUO (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
SONY CORP371977–2008
MITSUMI ELECTRIC CO LTD32010–2013
TANAKA HIDENORI22012–2013
TERADA YUKIHIRO22012–2013
YAMAZAKI KAZUO22012–2013
Locations
LocationPatentsSpan
Kanagawa, JP311997–2008
Kawasaki, JP71977–2013
Atsugi, JP12010
Kangawa, JP12000