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For the Inventor, By the Inventor

Farmington Hills, MI, United States of America

Welding Technology Corporation


USPTO Granted Patents = 3

% Expired Patents = 100.0

Trademarks = 2

Forward Citations = 49

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2 inventors (with patents filed for the assignee):

goldMedal John Foster Farrow (3 out of 13 patents)

silverMedal Jeffrey J Mason (1 out of 1 patent)


3 patents:

1. 8212570 - Amplifier circuit for a current transformer (2012-07-03),
2. 8174399 - Methods to detect hazardous conditions in a safety ground circuit in the presence of ground loop currents and electrical noise (2012-05-08),
3. 7420133 - Door interlock for rotary actuated circuit breaker (2008-09-02),
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USPTO Data Jan 1 1976 - Sep 29 2026

3 Patents

#54 in Farmington Hills, MI

#2,489 in Michigan

#73,766 in US

Farmington Hills, MI (US)
Farmington Hills, MI, United States of America

Welding Technology Corporation

Forward Citations = 49

2 inventors:

goldMedal John Foster Farrow (3 out of 13 patents)

silverMedal Jeffrey J Mason (1 out of 1 patent)

Please report any incorrect information to [email protected]
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