Inventor
KOGA KEIJI
JP41 patents
⚠️ This page may combine multiple inventors who share the name “KOGA KEIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TDK CORP
37 patentsUS5419938AMay 30, 1995
Magnetic recording medium comprising two magnetic layers of hexagonal ferrite magnetic particles and binder wherein the easy axes of the particle is specified
TDK CORP111 citations97
US5589297ADec 31, 1996
Lithium secondary cell
TDK CORP71 citations95
US5565284AOct 15, 1996
Lithium secondary cell
TDK CORP89 citations94
US5340698AAug 23, 1994
Optical disk
TDK CORP22 citations93
US6930911B2Aug 16, 2005
Magnetic memory device, method for writing on the same and method for reading from the same
TDK CORP24 citations92
US5530609AJun 25, 1996
Magnetic recording/reproducing method using a thin film magnetic
TDK CORP26 citations92
US4794042ADec 27, 1988
Magnetic recording medium
TDK CORP35 citations92
US4772522ASep 20, 1988
Magnetic recording medium
TDK CORP28 citations92
US5160761ANov 3, 1992
Method for making a magnetic disk
TDK CORP26 citations91
US7991377B2Aug 2, 2011
Mixer and frequency converting apparatus
TDK CORP8 citations84
US7825658B2Nov 2, 2010
Magnetic device and frequency detector
TDK CORP11 citations84
US7808229B2Oct 5, 2010
Magnetic device and frequency analyzer
TDK CORP8 citations84
US6996001B2Feb 7, 2006
Magnetic memory device, write current drive circuit, and write current drive method
TDK CORP13 citations84
US7209380B2Apr 24, 2007
Magnetic memory device and method of reading the same
TDK CORP15 citations83
US7295460B2Nov 13, 2007
Magnetic memory cell, magnetic memory device, and method of manufacturing magnetic memory device
TDK CORP7 citations74
US7227771B2Jun 5, 2007
Magnetoresistive effect element and magnetic memory device
TDK CORP8 citations74
US7016221B2Mar 21, 2006
Magnetoresistive effect element, magnetic memory device and method of fabricating the same
TDK CORP7 citations74
US5219708AJun 15, 1993
Optical disk
TDK CORP13 citations74
US4780366AOct 25, 1988
Magnetic recording medium for image recording
TDK CORP11 citations74
US7277320B2Oct 2, 2007
Magnetic memory device, sense amplifier circuit and method of reading from magnetic memory device
TDK CORP7 citations73
US4741977AMay 3, 1988
Magnetic sheet
TDK CORP9 citations73
US5182693AJan 26, 1993
Magnetic disk
TDK CORP8 citations72
US5140486AAug 18, 1992
Magnetic recording and reproduction
TDK CORP14 citations72
US7796419B2Sep 14, 2010
Magnetic memory
TDK CORP2 citations63
US7697323B2Apr 13, 2010
Magnetic storage device
TDK CORP2 citations63
US7649766B2Jan 19, 2010
Magnetic storage device
TDK CORP2 citations63
US7535757B2May 19, 2009
Magnetic memory
TDK CORP2 citations63
US7471550B2Dec 30, 2008
Magnetic memory
TDK CORP3 citations63
US7342822B2Mar 11, 2008
Magnetic memory device, write current driver circuit and write current driving method
TDK CORP5 citations62
US7230843B2Jun 12, 2007
Magnetic memory device and writing method of the same
TDK CORP4 citations62
US6493182B1Dec 10, 2002
Magnetic head
TDK CORP6 citations62
US5393584AFeb 28, 1995
Magnetic disc
TDK CORP4 citations61
US7613033B2Nov 3, 2009
Magnetic storage device
TDK CORP2 citations57
US7973375B2Jul 5, 2011
Spin transistor and method of manufacturing same
TDK CORP1 citations52
US7683446B2Mar 23, 2010
Magnetic memory using spin injection flux reversal
TDK CORP1 citations52
US7522450B2Apr 21, 2009
Magnetic storage cell, magnetic memory device and magnetic memory device manufacturing method
TDK CORP0 citations52
US7470964B2Dec 30, 2008
Magnetic memory and manufacturing method thereof
TDK CORP0 citations42