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Izumi Sankawa

USPTO Granted Patents = 6

EPO Patents = 1 (Patent Applications = 1)

Average Co-Inventor Count = 4.3

ph-index = 4

Forward Citations = 87(Granted Patents)

Location History:

Ibaraki, JP (1993)
Mito, JP (1995)
Setagaya, JP (1995)
Tokyo, JP (1995)
Kawasaki, JP (2007)

Company Filing History:

Nippon Telegraph and Telephone Corporation

4 out of 10,264

Sumitomo Electric Industries, Limited

The Furukawa Electric Co., Ltd.

where one patent can have more than one assignee

Years Active: 1993-2007

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6 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7228040 - Hole-assisted single mode optical fiber (2007-06-05),

2. 5446810 - Optical switch, optical fiber arranging member and method of (1995-08-29),

3. 5430824 - Optical fibre, waveguide, and optical active device (1995-07-04),

4. 5422975 - Optical filter doped with rare earth elements and used with optical (1995-06-06),

5. 5396569 - Optical line monitoring method and an apparatus permitting simultaneous (1995-03-07),

6. 5214728 - Light communication system (1993-05-25),

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