Naomitsu Umemura

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Retarder and optical head device installing the same
- Patent number 6,917,576
- Issue date Jul 12, 2005
- Asahi Glass Company, Limited
- Takehiko Nishiyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Phase shifter and optical head device mounted with the same
- Patent number 6,580,674
- Issue date Jun 17, 2003
- Asahi Glass Company, Limited
- Takehiko Nishiyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Ultrasonic delay line device with an adjusting circuit for adjustin...
- Patent number 5,142,254
- Issue date Aug 25, 1992
- Asahi Glass Company Ltd.
- Etsuji Kimura
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Ultrasonic-wave delay element
- Patent number 4,733,204
- Issue date Mar 22, 1988
- Asahi Glass Company Ltd.
- Michihiko Uemura
- H03 - BASIC ELECTRONIC CIRCUITRY

Patents Applicationslast 30 patents

Information Patent Application
Diffraction element and optical head device
- Publication number 20060193235
- Publication date Aug 31, 2006
- ASAHI GLASS COMPANY LIMITED
- Koichi Murata
- G02 - OPTICS
Information Patent Application
Retarder and optical head device installing the same
- Publication number 20030174631
- Publication date Sep 18, 2003
- ASAHI GLASS COMPANY, LIMITED
- Takehiko Nishiyama
- G02 - OPTICS
Information Patent Application
Retarder and optical head device installing the same
- Publication number 20030123371
- Publication date Jul 3, 2003
- ASAHI GLASS COMPANY, LIMITED
- Takehiko Nishiyama
- G02 - OPTICS