Takashi Ishiwada

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Sapporo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical amplifier using reflection-type variable optical attenuator...
- Patent number 7,209,284
- Issue date Apr 24, 2007
- Fujitsu Limited
- Norifumi Shukunami
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Transmission wavelength characteristics variable optical element, a...
- Patent number 7,016,096
- Issue date Mar 21, 2006
- Fujitsu Limited
- Hirotomo Izumi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
TRANSMISSION WAVELENGTH CHARACTERISTICS VARIABLE OPTICAL ELEMENT, A...
- Patent number 6,862,126
- Issue date Mar 1, 2005
- Fujitsu Limited
- Takashi Ishiwada
- G02 - OPTICS

Patents Applicationslast 30 patents

Information Patent Application
Optical apparatus
- Publication number 20050270635
- Publication date Dec 8, 2005
- FUJITSU LIMITED
- Norifumi Shukunami
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Transmission wavelength characteristics variable optical element, a...
- Publication number 20030218796
- Publication date Nov 27, 2003
- FUJITSU LIMITED
- Hirotomo Izumi
- G02 - OPTICS
Information Patent Application
Transmission wavelength characteristics variable optical element, a...
- Publication number 20030174381
- Publication date Sep 18, 2003
- FUJITSU LIMITED
- Takashi Ishiwada
- G02 - OPTICS