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For the Inventor, By the Inventor

Markham, Canada

Indigo Manufacturing Inc.


USPTO Granted Patents = 3

Trademarks = 1

Forward Citations = 149

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3 inventors (with patents filed for the assignee):

goldMedal John Barry French (3 out of 30 patents)

silverMedal Charles Robert May (1 out of 1 patent)

bronzeMedal David I Russell (1 out of 1 patent)


3 patents:

1. 6825726 - Power amplifier with multiple power supplies (2004-11-30),
2. 6160455 - Derived power supply for composite bridge amplifiers (2000-12-12),
3. 6108219 - DC power converter circuit (2000-08-22),
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USPTO Data Jan 1 1976 - Dec 30 2025

3 Patents

#52 in Markham

#4,250 in Canada

...
Markham, Canada

Indigo Manufacturing Inc.

Forward Citations = 149

3 inventors:

goldMedal John Barry French (3 out of 30 patents)

silverMedal Charles Robert May (1 out of 1 patent)

bronzeMedal David I Russell (1 out of 1 patent)

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