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For the Inventor, By the Inventor

Taichung, Taiwan

Donell Optronics Co., Ltd.


USPTO Granted Patents = 3

% Expired Patents = 33.3

Forward Citations = 20

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1 inventor (with patents filed for the assignee):

goldMedal Ming-Chung Cheng (3 out of 6 patents)


3 patents:

1. 8721200 - Protector for camera lens (2014-05-13),
2. 8054545 - Lens hood for a camera lens (2011-11-08),
3. 7516991 - Pipework with a fastening device (2009-04-14),
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USPTO Data Jan 1 1976 - Oct 6 2026

3 Patents

#397 in Taichung

#3,307 in Taiwan

Taichung, TW
Taichung, Taiwan

Donell Optronics Co., Ltd.

Forward Citations = 20

1 inventor:

goldMedal Ming-Chung Cheng (3 out of 6 patents)

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