Keiji Koga

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Mixer and frequency converting apparatus
- Patent number 7,991,377
- Issue date Aug 2, 2011
- TDK Corporation
- Yuji Kakinuma
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Spin transistor and method of manufacturing same
- Patent number 7,973,375
- Issue date Jul 5, 2011
- TDK Corporation
- Keiji Koga
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Magnetic device and frequency detector
- Patent number 7,825,658
- Issue date Nov 2, 2010
- TDK Corporation
- Keiji Koga
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Magnetic device and frequency analyzer
- Patent number 7,808,229
- Issue date Oct 5, 2010
- TDK Corporation
- Keiji Koga
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Magnetic memory
- Patent number 7,796,419
- Issue date Sep 14, 2010
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic storage device
- Patent number 7,697,323
- Issue date Apr 13, 2010
- TDK Corporation
- Katsumichi Tagami
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory using spin injection flux reversal
- Patent number 7,683,446
- Issue date Mar 23, 2010
- TDK Corporation
- Keiji Koga
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Magnetic storage device
- Patent number 7,649,766
- Issue date Jan 19, 2010
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic storage device
- Patent number 7,613,033
- Issue date Nov 3, 2009
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory
- Patent number 7,535,757
- Issue date May 19, 2009
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic storage cell, magnetic memory device and magnetic memory d...
- Patent number 7,522,450
- Issue date Apr 21, 2009
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory
- Patent number 7,471,550
- Issue date Dec 30, 2008
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory and manufacturing method thereof
- Patent number 7,470,964
- Issue date Dec 30, 2008
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory device, write current driver circuit and write curr...
- Patent number 7,342,822
- Issue date Mar 11, 2008
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory cell, magnetic memory device, and method of manufac...
- Patent number 7,295,460
- Issue date Nov 13, 2007
- TDK Corporation
- Joichiro Ezaki
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Magnetic memory device, sense amplifier circuit and method of readi...
- Patent number 7,277,320
- Issue date Oct 2, 2007
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory device and writing method of the same
- Patent number 7,230,843
- Issue date Jun 12, 2007
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetoresistive effect element and magnetic memory device
- Patent number 7,227,771
- Issue date Jun 5, 2007
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory device and method of reading the same
- Patent number 7,209,380
- Issue date Apr 24, 2007
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetoresistive effect element, magnetic memory device and method...
- Patent number 7,016,221
- Issue date Mar 21, 2006
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory device, write current drive circuit, and write curr...
- Patent number 6,996,001
- Issue date Feb 7, 2006
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic memory device, method for writing on the same and method f...
- Patent number 6,930,911
- Issue date Aug 16, 2005
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic head
- Patent number 6,493,182
- Issue date Dec 10, 2002
- TDK Corporation
- Noboru Yamanaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Lithium secondary cell
- Patent number 5,589,297
- Issue date Dec 31, 1996
- TDK Corporation
- Keiji Koga
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Lithium secondary cell
- Patent number 5,565,284
- Issue date Oct 15, 1996
- TDK Corporation
- Keiji Koga
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Magnetic recording/reproducing method using a thin film magnetic
- Patent number 5,530,609
- Issue date Jun 25, 1996
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording medium comprising two magnetic layers of hexagon...
- Patent number 5,419,938
- Issue date May 30, 1995
- TDK Corporation
- Tsuneo Kagotani
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic disc
- Patent number 5,393,584
- Issue date Feb 28, 1995
- TDK Corporation
- Jun-ichi Satoh
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical disk
- Patent number 5,340,698
- Issue date Aug 23, 1994
- TDK Corporation
- Hideki Hirata
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical disk
- Patent number 5,219,708
- Issue date Jun 15, 1993
- TDK Corporation
- Hideki Hirata
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
MIXER AND FREQUENCY CONVERTING APPARATUS
- Publication number 20090243698
- Publication date Oct 1, 2009
- TDK Corporation
- Yuji KAKINUMA
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
MAGNETIC DEVICE AND FREQUENCY DETECTOR
- Publication number 20090140733
- Publication date Jun 4, 2009
- TDK Corporation
- Keiji KOGA
- G01 - MEASURING TESTING
Information Patent Application
SPIN TRANSISTOR AND METHOD OF MANUFACTURING SAME
- Publication number 20090057793
- Publication date Mar 5, 2009
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic storage device
- Publication number 20090027949
- Publication date Jan 29, 2009
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic device and frequency analyzer
- Publication number 20080180085
- Publication date Jul 31, 2008
- TDK Corporation
- Keiji Koga
- G01 - MEASURING TESTING
Information Patent Application
Magnetic storage device
- Publication number 20080144227
- Publication date Jun 19, 2008
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory
- Publication number 20080094883
- Publication date Apr 24, 2008
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic storage device
- Publication number 20080024935
- Publication date Jan 31, 2008
- Katsumichi Tagami
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory
- Publication number 20070195594
- Publication date Aug 23, 2007
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory
- Publication number 20070121373
- Publication date May 31, 2007
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory cell, magnetic memory device, and magnetic memory d...
- Publication number 20070019462
- Publication date Jan 25, 2007
- TDK Corporation
- Joichiro Ezaki
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Magnetic storage cell and magnetic memory device
- Publication number 20060279980
- Publication date Dec 14, 2006
- TDK Corporation
- Susumu Haratani
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory and method of manufacturing same
- Publication number 20060266470
- Publication date Nov 30, 2006
- TDK Corporation
- Keiji Koga
- B82 - NANO-TECHNOLOGY
Information Patent Application
Magnetic memory device, write current driver circuit and write curr...
- Publication number 20060256461
- Publication date Nov 16, 2006
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetoresistive effect element and magnetic memory
- Publication number 20060203538
- Publication date Sep 14, 2006
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetoresistive element and magnetic memory device
- Publication number 20060193165
- Publication date Aug 31, 2006
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
MAGNETIC MEMORY DEVICE AND METHOD OF READING THE SAME
- Publication number 20060120145
- Publication date Jun 8, 2006
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory device, sense amplifier circuit and method of readi...
- Publication number 20060120146
- Publication date Jun 8, 2006
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory device and writing method of the same
- Publication number 20060098478
- Publication date May 11, 2006
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic storage cell, magnetic memory device and magnetic memory d...
- Publication number 20060067111
- Publication date Mar 30, 2006
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory
- Publication number 20060062075
- Publication date Mar 23, 2006
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory and manufacturing method thereof
- Publication number 20060056232
- Publication date Mar 16, 2006
- TDK Corporation
- Keiji Koga
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory device, write current drive circuit, and write curr...
- Publication number 20040114443
- Publication date Jun 17, 2004
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetoresistive effect element, magnetic memory device and method...
- Publication number 20040114275
- Publication date Jun 17, 2004
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE
Information Patent Application
Magnetic memory device, method for writing on the same and method f...
- Publication number 20040114425
- Publication date Jun 17, 2004
- TDK Corporation
- Joichiro Ezaki
- G11 - INFORMATION STORAGE

Person

Patents Grantslast 30 patents

Mixer and frequency converting apparatus

Spin transistor and method of manufacturing same

Magnetic device and frequency detector

Magnetic device and frequency analyzer

Magnetic memory

Magnetic storage device

Magnetic memory using spin injection flux reversal

Magnetic storage device

Magnetic storage device

Magnetic memory

Magnetic storage cell, magnetic memory device and magnetic memory d...

Magnetic memory

Magnetic memory and manufacturing method thereof

Magnetic memory device, write current driver circuit and write curr...

Magnetic memory cell, magnetic memory device, and method of manufac...

Magnetic memory device, sense amplifier circuit and method of readi...

Magnetic memory device and writing method of the same

Magnetoresistive effect element and magnetic memory device

Magnetic memory device and method of reading the same

Magnetoresistive effect element, magnetic memory device and method...

Magnetic memory device, write current drive circuit, and write curr...

Magnetic memory device, method for writing on the same and method f...

Magnetic head

Lithium secondary cell

Lithium secondary cell

Magnetic recording/reproducing method using a thin film magnetic

Magnetic recording medium comprising two magnetic layers of hexagon...

Magnetic disc

Optical disk

Optical disk

Patents Applicationslast 30 patents

MIXER AND FREQUENCY CONVERTING APPARATUS

MAGNETIC DEVICE AND FREQUENCY DETECTOR

SPIN TRANSISTOR AND METHOD OF MANUFACTURING SAME

Magnetic storage device

Magnetic device and frequency analyzer

Magnetic storage device

Magnetic memory

Magnetic storage device

Magnetic memory

Magnetic memory

Magnetic memory cell, magnetic memory device, and magnetic memory d...

Magnetic storage cell and magnetic memory device

Magnetic memory and method of manufacturing same

Magnetic memory device, write current driver circuit and write curr...

Magnetoresistive effect element and magnetic memory

Magnetoresistive element and magnetic memory device

MAGNETIC MEMORY DEVICE AND METHOD OF READING THE SAME

Magnetic memory device, sense amplifier circuit and method of readi...

Magnetic memory device and writing method of the same

Magnetic storage cell, magnetic memory device and magnetic memory d...

Magnetic memory

Magnetic memory and manufacturing method thereof

Magnetic memory device, write current drive circuit, and write curr...

Magnetoresistive effect element, magnetic memory device and method...

Magnetic memory device, method for writing on the same and method f...