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For the Inventor, By the Inventor

Kettering, OH, United States of America

Spd Electrical Systems


USPTO Granted Patents = 3

Forward Citations = 4

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4 inventors (with patents filed for the assignee):

goldMedal John P Barber (3 out of 39 patents)

silverMedal John I Ykema (2 out of 9 patents)

bronzeMedal Antonios Challita (1 out of 13 patents)

4.  Robert Lawler (1 out of 1 patent)


3 patents:

1. 8614868 - Graded resistance solid state current control circuit (2013-12-24),
2. 8223469 - Power node switching center with active feedback control of power switches (2012-07-17),
3. 7667938 - Power node switching center (2010-02-23),
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USPTO Data Jan 1 1976 - Sep 29 2026

3 Patents

#6 in Kettering, OH

#2,860 in Ohio

#73,766 in US

Kettering, OH (US)
Kettering, OH, United States of America

Spd Electrical Systems

Forward Citations = 4

4 inventors:

goldMedal John P Barber (3 out of 39 patents)

silverMedal John I Ykema (2 out of 9 patents)

bronzeMedal Antonios Challita (1 out of 13 patents)

4.  Robert Lawler (1 out of 1 patent)

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