Inventor
KUMAGAI EIJI
JP36 patents
⚠️ This page may combine multiple inventors who share the name “KUMAGAI EIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SONY CORP
21 patentsUS6034937AMar 7, 2000
Optical disc reproduction method and optical disc reproduction apparatus
SONY CORP90 citations98
US6147941ANov 14, 2000
Optical disc device and optical disc discriminating method
SONY CORP45 citations96
US6034934AMar 7, 2000
Disc reproduction apparatus
SONY CORP76 citations96
US6594210B2Jul 15, 2003
Disc drive apparatus and method for generating wobble information
SONY CORP35 citations92
US6288987B1Sep 11, 2001
Optical disc device and optical disc discriminating method
SONY CORP15 citations92
US6252834B1Jun 26, 2001
Optical disc device and optical disc discriminating method
SONY CORP30 citations92
US6005832ADec 21, 1999
Optical disc device and optical disc discriminating method
SONY CORP31 citations92
US5703852ADec 30, 1997
Optical disk reproducing apparatus having a cosine equalizer with boosted frequency characteristics
SONY CORP23 citations92
US6714509B2Mar 30, 2004
Disk recording medium and disk drive apparatus
SONY CORP16 citations84
US6229772B1May 8, 2001
Optical disc device and optical disc discriminating method
SONY CORP19 citations83
US9608451B2Mar 28, 2017
Electric power supplying apparatus, electric power supplying method, inverter, and electric vehicle
SONY CORP9 citations82
US6288988B1Sep 11, 2001
Optical disc device and optical disc discriminating method
SONY CORP9 citations74
US5636196AJun 3, 1997
Optical disc apparatus with selectively shiftable seek operation capture range
SONY CORP16 citations74
US5003523AMar 26, 1991
Apparatus for recording and reproducing information on an optical disk with a focus servo system for avoiding influence of traverse signal during search
SONY CORP8 citations74
US6757227B2Jun 29, 2004
Optical drive apparatus for use with different recording media, tracking control method for use therein, and optical disc
SONY CORP12 citations71
US9270135B2Feb 23, 2016
Power supply apparatus and power supply switching method
SONY CORP2 citations63
US7274631B2Sep 25, 2007
Optical-disc driving apparatus, optical-disc driving method, storage medium, and program
SONY CORP6 citations63
US9966759B2May 8, 2018
Battery monitor circuit, storage apparatus, electronic apparatus, electric-powered vehicle, and power system
SONY CORP1 citations49
US7379406B2May 27, 2008
Optical recording apparatus, and method for controlling laser power therein by filtering and then sampling a returned light signal
SONY CORP0 citations39
US6819642B2Nov 16, 2004
Data recording device, data reproducing device, and optical disc
SONY CORP0 citations39
US9929559B2Mar 27, 2018
Electricity storage device, electricity storage system, and method for controlling electricity storage device
SONY CORP0 citations33
KUMAGAI EIJI
6 patentsUS8907624B2Dec 9, 2014
Multi-battery pack battery system with direct communication between controller and the battery packs
KUMAGAI EIJI7 citations83
US9608464B2Mar 28, 2017
Control device, electric storage system, electronic device, electric vehicle, and electric power system to boot up a power source
KUMAGAI EIJI2 citations72
US9419458B2Aug 16, 2016
Storage system, electronic device, electric vehicle and power system
KUMAGAI EIJI4 citations72
US9178366B2Nov 3, 2015
Battery monitor circuit, storage apparatus, electronic apparatus, electric-powered vehicle, and power system
KUMAGAI EIJI4 citations69
US9018911B2Apr 28, 2015
Electric circuit, charge control device, charge system, and control method
KUMAGAI EIJI0 citations51
US9698449B2Jul 4, 2017
Storage system and output controller
KUMAGAI EIJI0 citations41
MURATA MANUFACTURING CO
3 patentsUS10008862B2Jun 26, 2018
Power storage device, power storage system, and control method of power storage device
MURATA MANUFACTURING CO17 citations84
US10587127B2Mar 10, 2020
Charging device, charging control method, electricity storage device, power storage device, power system, and electric vehicle
MURATA MANUFACTURING CO3 citations72
US9991702B2Jun 5, 2018
Control device to boot up power source
MURATA MANUFACTURING CO0 citations52