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For the Inventor, By the Inventor

Fenton, MO, United States of America

Edco USA


USPTO Granted Patents = 3

% Expired Patents = 66.7

Forward Citations = 29

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1 inventor (with patents filed for the assignee):

goldMedal Edwin L Johnson (3 out of 11 patents)


3 patents:

1. 10502237 - Method and system for attenuating transmission of high amplitude oscillations by a vacuum system (2019-12-10),
2. 9964230 - Retarder control valve assembly and system for rail cars (2018-05-08),
3. 9732876 - Retarder control valve assembly and system for rail cars (2017-08-15),
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USPTO Data Jan 1 1976 - Sep 29 2026

3 Patents

#34 in Fenton, MO

#1,026 in Missouri

#73,766 in US

Fenton, MO (US)
Fenton, MO, United States of America

Edco USA

Forward Citations = 29

1 inventor:

goldMedal Edwin L Johnson (3 out of 11 patents)

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