Seiichi Ohsawa

Person

Tochigi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical disk drive and optical pickup having aberration correction...
- Patent number 8,111,594
- Issue date Feb 7, 2012
- Citizen Holdings Co., Ltd.
- Masayuki Iwasaki
- G11 - INFORMATION STORAGE
Information Patent Grant
Multi-layer information recording medium and information recording...
- Patent number RE40556
- Issue date Oct 28, 2008
- Pioneer Corporation
- Seiichi Ohsawa
- 428 - Stock material or miscellaneous articles
Information Patent Grant
High density optical recording medium and method for reproducing th...
- Patent number 7,190,664
- Issue date Mar 13, 2007
- Pioneer Corporation
- Takuma Yanagisawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Multi-layer information recording medium and information recording...
- Patent number RE39463
- Issue date Jan 9, 2007
- Pioneer Corporation
- Seiichi Ohsawa
- 428 - Stock material or miscellaneous articles
Information Patent Grant
Multi-layer information recording medium and information recording...
- Patent number RE39322
- Issue date Oct 3, 2006
- Pioneer Corporation
- Seiichi Ohsawa
- 428 - Stock material or miscellaneous articles
Information Patent Grant
Multi-layer information recording medium and information recording...
- Patent number 6,773,781
- Issue date Aug 10, 2004
- Pioneer Corporation
- Seiichi Ohsawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Tilt detector
- Patent number 6,418,104
- Issue date Jul 9, 2002
- Pioneer Corporation
- Makoto Sato
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical disk
- Patent number 5,615,206
- Issue date Mar 25, 1997
- Pioneer Electronic Corporation
- Takuma Yanagisawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Multi-layered recording disk and recording/reproducing system using...
- Patent number 5,608,715
- Issue date Mar 4, 1997
- Pioneer Electronic Corporation
- Fumihiko Yokogawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Information detection light intensity control apparatus in optical...
- Patent number 5,546,372
- Issue date Aug 13, 1996
- Pioneer Electronic Corporation
- Seiichi Ohsawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Second harmonics generating optical recording layer
- Patent number 5,455,817
- Issue date Oct 3, 1995
- Pioneer Electronic Corporation
- Takuma Yanagisawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical recording medium having a third non-linear optical reflecti...
- Patent number 5,381,391
- Issue date Jan 10, 1995
- Pioneer Electronic Corporation
- Takuma Yanagisawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information reading apparatus with controlled numerical ape...
- Patent number 5,365,052
- Issue date Nov 15, 1994
- Pioneer Electronic Corporation
- Takuma Yanagisawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Tracking error signal generating device for preventing offset of th...
- Patent number 5,258,968
- Issue date Nov 2, 1993
- Pioneer Electronic Corporation
- Norio Matsuda
- G11 - INFORMATION STORAGE
Information Patent Grant
Fibre-type light conversion device
- Patent number 4,919,511
- Issue date Apr 24, 1990
- Pioneer Electronic Corporation
- Seiichi Ohsawa
- G02 - OPTICS
Information Patent Grant
Fibre-type light wavelength conversion device
- Patent number 4,874,221
- Issue date Oct 17, 1989
- Pioneer Electronic Corporation
- Seiichi Ohsawa
- G02 - OPTICS

Patents Applicationslast 30 patents

Information Patent Application
Optical disk drive and optical pickup
- Publication number 20060181971
- Publication date Aug 17, 2006
- Citizen Watch Co., Ltd.
- Masayuki Iwasaki
- G02 - OPTICS
Information Patent Application
Optical disc and information reproducing apparatus for same
- Publication number 20030099183
- Publication date May 29, 2003
- Takuma Yanagisawa
- G11 - INFORMATION STORAGE
Information Patent Application
Optical disk, copy preventive method, and recordable optical disk
- Publication number 20030086360
- Publication date May 8, 2003
- PIONEER CORPORATION
- Toshio Suzuki
- G11 - INFORMATION STORAGE
Information Patent Application
Multi-layer information recording medium and information recording...
- Publication number 20020176971
- Publication date Nov 28, 2002
- PIONEER CORPORATION
- Seiichi Ohsawa
- G11 - INFORMATION STORAGE
Information Patent Application
Optical disc having pits of desired taper angle
- Publication number 20020080713
- Publication date Jun 27, 2002
- PIONEER CORPORATION
- Takayuki Nomoto
- G11 - INFORMATION STORAGE

Seiichi Ohsawa

Person

Patents Grantslast 30 patents

Optical disk drive and optical pickup having aberration correction...

Multi-layer information recording medium and information recording...

High density optical recording medium and method for reproducing th...

Multi-layer information recording medium and information recording...

Multi-layer information recording medium and information recording...

Multi-layer information recording medium and information recording...

Tilt detector

Optical disk

Multi-layered recording disk and recording/reproducing system using...

Information detection light intensity control apparatus in optical...

Second harmonics generating optical recording layer

Optical recording medium having a third non-linear optical reflecti...

Optical information reading apparatus with controlled numerical ape...

Tracking error signal generating device for preventing offset of th...

Fibre-type light conversion device

Fibre-type light wavelength conversion device

Patents Applicationslast 30 patents

Optical disk drive and optical pickup

Optical disc and information reproducing apparatus for same

Optical disk, copy preventive method, and recordable optical disk

Multi-layer information recording medium and information recording...

Optical disc having pits of desired taper angle