Kazuhiro Umeki

Person

Hanamaki, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical element, polarization filter, optical isolator, and optical...
- Patent number 8,830,585
- Issue date Sep 9, 2014
- Ricoh Company, Ltd.
- Hideaki Hirai
- G02 - OPTICS
Information Patent Grant
Optical pickup and optical information processing device
- Patent number 8,259,555
- Issue date Sep 4, 2012
- Ricoh Company, Ltd.
- Yukiko Hamano
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical device and method of producing the same
- Patent number 8,178,010
- Issue date May 15, 2012
- Ricoh Company, Ltd.
- Hideaki Hirai
- G11 - INFORMATION STORAGE
Information Patent Grant
Reflecting wavelength plate and optical pickup using reflecting wav...
- Patent number 8,154,976
- Issue date Apr 10, 2012
- Ricoh Company, Ltd.
- Hideaki Hirai
- G11 - INFORMATION STORAGE
Information Patent Grant
Reflecting wavelength plate and optical pickup using reflecting wav...
- Patent number 8,154,977
- Issue date Apr 10, 2012
- Ricoh Company, Ltd.
- Hideaki Hirai
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical element and optical device
- Patent number 7,894,133
- Issue date Feb 22, 2011
- Ricoh Company, Ltd.
- Hideaki Hirai
- G02 - OPTICS
Information Patent Grant
Optical device, method of producing the same, optical pickup, and o...
- Patent number 7,697,395
- Issue date Apr 13, 2010
- Ricoh Company, Ltd.
- Hideaki Hirai
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical pickup and optical data processing apparatus
- Patent number 7,502,300
- Issue date Mar 10, 2009
- Ricoh Company, Ltd.
- Hideaki Hirai
- G11 - INFORMATION STORAGE
Information Patent Grant
Gradation mask method of producing the same and method of forming s...
- Patent number 5,830,605
- Issue date Nov 3, 1998
- Ricoh Optical Industries Co., Ltd.
- Kazuhiro Umeki
- G02 - OPTICS
Information Patent Grant
Exposure mask, method of producing the same, exposure mask producin...
- Patent number 5,776,639
- Issue date Jul 7, 1998
- Ricoh Optical Industries, Co., Ltd.
- Kazuhiro Umeki
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Optical information recording medium
- Patent number 5,368,908
- Issue date Nov 29, 1994
- Ricoh Company, Ltd.
- Wasaburo Ohta
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL ELEMENT, POLARIZATION FILTER, OPTICAL ISOLATOR, AND OPTICAL...
- Publication number 20120002280
- Publication date Jan 5, 2012
- Hideaki Hirai
- G02 - OPTICS
Information Patent Application
REFLECTING WAVELENGTH PLATE AND OPTICAL PICKUP USING REFLECTING WAV...
- Publication number 20100278029
- Publication date Nov 4, 2010
- RICOH COMPANY, LTD.
- Hideaki HIRAI
- G11 - INFORMATION STORAGE
Information Patent Application
OPTICAL DEVICE, METHOD OF PRODUCING THE SAME, OPTICAL PICKUP, AND O...
- Publication number 20100155977
- Publication date Jun 24, 2010
- Hideaki Hirai
- G02 - OPTICS
Information Patent Application
OPTICAL PICKUP AND OPTICAL INFORMATION PROCESSING DEVICE
- Publication number 20100135130
- Publication date Jun 3, 2010
- Yukiko Hamano
- G11 - INFORMATION STORAGE
Information Patent Application
REFLECTING WAVELENGTH PLATE AND OPTICAL PICKUP USING REFLECTING WAV...
- Publication number 20100054110
- Publication date Mar 4, 2010
- RICOH COMAPANY, LTD.
- Hideaki HIRAI
- G11 - INFORMATION STORAGE
Information Patent Application
OPTICAL ELEMENT AND OPTICAL DEVICE
- Publication number 20080106789
- Publication date May 8, 2008
- Hideaki Hirai
- G02 - OPTICS
Information Patent Application
Optical device, method of producing the same, optical pickup, and o...
- Publication number 20050195485
- Publication date Sep 8, 2005
- Hideaki Hirai
- G02 - OPTICS
Information Patent Application
Optical pickup and optical data processing apparatus
- Publication number 20050025028
- Publication date Feb 3, 2005
- Hideaki Hirai
- G11 - INFORMATION STORAGE
Information Patent Application
Polarization optical device and manufacturing method therefor
- Publication number 20040174596
- Publication date Sep 9, 2004
- RICOH OPTICAL INDUSTRIES CO., LTD.
- Kazuhiro Umeki
- G02 - OPTICS

Kazuhiro Umeki

Person

Patents Grantslast 30 patents

Optical element, polarization filter, optical isolator, and optical...

Optical pickup and optical information processing device

Optical device and method of producing the same

Reflecting wavelength plate and optical pickup using reflecting wav...

Reflecting wavelength plate and optical pickup using reflecting wav...

Optical element and optical device

Optical device, method of producing the same, optical pickup, and o...

Optical pickup and optical data processing apparatus

Gradation mask method of producing the same and method of forming s...

Exposure mask, method of producing the same, exposure mask producin...

Optical information recording medium

Patents Applicationslast 30 patents

OPTICAL ELEMENT, POLARIZATION FILTER, OPTICAL ISOLATOR, AND OPTICAL...

REFLECTING WAVELENGTH PLATE AND OPTICAL PICKUP USING REFLECTING WAV...

OPTICAL DEVICE, METHOD OF PRODUCING THE SAME, OPTICAL PICKUP, AND O...

OPTICAL PICKUP AND OPTICAL INFORMATION PROCESSING DEVICE

REFLECTING WAVELENGTH PLATE AND OPTICAL PICKUP USING REFLECTING WAV...

OPTICAL ELEMENT AND OPTICAL DEVICE

Optical device, method of producing the same, optical pickup, and o...

Optical pickup and optical data processing apparatus

Polarization optical device and manufacturing method therefor