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For the Inventor, By the Inventor

Cleveland, OH, United States of America

Trd Inc.


USPTO Granted Patents = 2

Forward Citations = 3

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2 inventors (with patents filed for the assignee):

goldMedal Charles E Heinrich (2 out of 2 patents)

silverMedal Paul F Swenson (1 out of 30 patents)


2 patents:

1. 4681510 - Pump for saturated liquid (1987-07-21),
2. 4418538 - Method and apparatus for operating a self-starting air heating system (1983-12-06),
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USPTO Data Jan 1 1976 - Jan 6 2026

2 Patents

#433 in Cleveland, OH

#3,555 in Ohio

#92,695 in US

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Cleveland, OH, United States of America

Trd Inc.

Forward Citations = 3

2 inventors:

goldMedal Charles E Heinrich (2 out of 2 patents)

silverMedal Paul F Swenson (1 out of 30 patents)

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