Masamichi Utsumi

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Chiba, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical pickup for discriminating between and reading different typ...
- Patent number 6,366,543
- Issue date Apr 2, 2002
- Sony Corporation
- Kamon Uemura
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical pickup for discriminating between and reading different typ...
- Patent number 6,222,803
- Issue date Apr 24, 2001
- Sony Corporation
- Kamon Uemura
- G11 - INFORMATION STORAGE
Information Patent Grant
Hologram formed on an objective lens for one defracting light beams...
- Patent number 5,751,679
- Issue date May 12, 1998
- Sony Corporation
- Akio Yamakawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and device for identifying disc
- Patent number 5,742,575
- Issue date Apr 21, 1998
- Sony Corporation
- Akio Yamakawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus for playing back multilayer disk
- Patent number 5,682,372
- Issue date Oct 28, 1997
- Sony Corporation
- Akio Yamakawa
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
Optical pickup for discriminating between and reading different typ...
- Publication number 20010019520
- Publication date Sep 6, 2001
- Kamon Uemura
- G11 - INFORMATION STORAGE