Izumi Sankawa

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Setagaya, JP

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Patents Grantslast 30 patents

Information Patent Grant
Hole-assisted single mode optical fiber
- Patent number 7,228,040
- Issue date Jun 5, 2007
- Nippon Telegraph and Telephone Corporation
- Kazuhide Nakajima
- G02 - OPTICS
Information Patent Grant
Optical switch, optical fiber arranging member and method of manufa...
- Patent number 5,446,810
- Issue date Aug 29, 1995
- Sumitomo Electric Industries, Ltd.
- Tsutomu Watanabe
- G02 - OPTICS
Information Patent Grant
Optical fibre, waveguide, and optical active device
- Patent number 5,430,824
- Issue date Jul 4, 1995
- Sumitomo Electric Industries, Ltd.
- Yoshiki Chigusa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical filter doped with rare earth elements and used with optical...
- Patent number 5,422,975
- Issue date Jun 6, 1995
- Sumitomo Electric Industries, Ltd.
- Hiroo Kanamori
- G02 - OPTICS
Information Patent Grant
Optical line monitoring method and an apparatus permitting simultan...
- Patent number 5,396,569
- Issue date Mar 7, 1995
- The Furukawa Electric Co., Ltd.
- Hisaharu Yanagawa
- G01 - MEASURING TESTING
Information Patent Grant
Light communication system
- Patent number 5,214,728
- Issue date May 25, 1993
- Sumitomo Electric Industries, Ltd.
- Masayuki Shigematsu
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Single mode optical fiber with electron vacancies
- Publication number 20060045448
- Publication date Mar 2, 2006
- Kazuhide Nakajima
- G02 - OPTICS