Kei Hagiwara

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Kanagawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical disk device recording data on a recordable or rewritable op...
- Patent number 7,558,172
- Issue date Jul 7, 2009
- Ricoh Company, Ltd.
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical disk device recording data on a recordable or rewritable op...
- Patent number 7,230,891
- Issue date Jun 12, 2007
- Ricoh Company, Ltd.
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Grant
Pre-pit information-detecting apparatus, optical-information detect...
- Patent number 7,079,475
- Issue date Jul 18, 2006
- Ricoh Company, Ltd.
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical disk device recording data on a recordable or rewritable op...
- Patent number 6,987,717
- Issue date Jan 17, 2006
- Ricoh Company, Ltd.
- Kei Hagiwara
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
Optical disk device recording data on a recordable or rewritable op...
- Publication number 20070223330
- Publication date Sep 27, 2007
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Application
Information recording method and an information recording apparatus
- Publication number 20070115774
- Publication date May 24, 2007
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Application
Optical disk device recording data on a recordable or rewritable op...
- Publication number 20060023589
- Publication date Feb 2, 2006
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Application
Optical disk device recording data on a recordable or rewritable op...
- Publication number 20060023592
- Publication date Feb 2, 2006
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Application
Pre-pit information-detecting apparatus, optical-information detect...
- Publication number 20050122884
- Publication date Jun 9, 2005
- Kei Hagiwara
- G11 - INFORMATION STORAGE
Information Patent Application
Optical disk device recording data on a recordable or rewritable op...
- Publication number 20020044507
- Publication date Apr 18, 2002
- Kei Hagiwara
- G11 - INFORMATION STORAGE