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For the Inventor, By the Inventor

Tokyo, Japan

Photocrystal Inc.


USPTO Granted Patents = 2

% Expired Patents = 100.0

Forward Citations = 3

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4 inventors (with patents filed for the assignee):

goldMedal Kazushi Shirai (2 out of 17 patents)

silverMedal Norio Takeda (1 out of 33 patents)

bronzeMedal Tetsuya Iishi (1 out of 1 patent)

4.  Yohei Hanaki (1 out of 1 patent)


2 patents:

1. 6816300 - Optical apparatus (2004-11-09),
2. 6673146 - Method of manufacturing a magnet-free faraday rotator (2004-01-06),
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USPTO Data Jan 1 1976 - Sep 22 2026

2 Patents

#4,354 in Tokyo

#11,115 in Japan

Tokyo, JP
Tokyo, Japan

Photocrystal Inc.

Forward Citations = 3

4 inventors:

goldMedal Kazushi Shirai (2 out of 17 patents)

silverMedal Norio Takeda (1 out of 33 patents)

bronzeMedal Tetsuya Iishi (1 out of 1 patent)

4.  Yohei Hanaki (1 out of 1 patent)

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