For the Inventor, By the Inventor

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East Granby, CT, United States of America

Envirotest Systems Holdings Corp.

USPTO Granted Patents = 9

% Expired Patents = 77.8

EPO Patents = 3

Trademarks = 3

Forward Citations = 260

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12 inventors (with patents filed for the assignee):

Donald Hugh Stedman (6 out of 31 patents)

Robert Allen Gentala (2 out of 9 patents)

Peter Miles McClintock (2 out of 2 patents)

4. James Johnson (1 out of 69 patents)

5. Michael D Jack (1 out of 25 patents)

6. Donald Jackson Avery (1 out of 2 patents)

7. Terry Edward Goretti (1 out of 2 patents)

8. David R Nelson (1 out of 7 patents)

9. Troy P Bahan (1 out of 4 patents)

10. George C Polchin (1 out of 3 patents)

11. Jay Peterson (1 out of 2 patents)

12. John DiDomenico (1 out of 15 patents)

13. Gary Bishop (0 patent)

9 patents: Sort by Forward Citations

1. 9057664 - System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles (2015-06-16),

2. 8838396 - Remote vehicle emissions sensing system and method for differentiating water from hydrocarbons (2014-09-16),

3. RE44976 - Speed and acceleration monitoring device using visible laser beams (2014-06-30),

4. 8447528 - Remote vehicle emissions sensing system and method for differentiating water from hydrocarbons (2013-05-21),

5. RE44214 - Unmanned integrated optical remote emissions sensor (RES) for motor vehicles (2013-05-13),

6. 8429957 - System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles (2013-04-30),

7. 8355837 - System and method for testing the integrity of a vehicle testing/diagnostic system (2013-01-15),

8. 8347701 - System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles (2013-01-08),

9. 8266952 - System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles (2012-09-18),

Envirotest Systems Holdings Corp. is a leading provider of vehicle emissions testing equipment and services. With a strong emphasis on environmental protection and compliance, the company helps governments and private sector organizations around the world monitor and reduce harmful emissions from vehicles. Envirotest's state-of-the-art technology and expertise make them a trusted partner in the fight against air pollution.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

9 Patents

#5 in East Granby, CT

#695 in Connecticut

#32,549 in US

East Granby, CT, United States of America

Envirotest Systems Holdings Corp.

Forward Citations = 260

12 inventors:

Donald Hugh Stedman (6 out of 31 patents)

Robert Allen Gentala (2 out of 9 patents)

Peter Miles McClintock (2 out of 2 patents)

4. James Johnson (1 out of 69 patents)

5. Michael D Jack (1 out of 25 patents)

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