For the Inventor, By the Inventor

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Bensenville, IL, United States of America

The Protectoseal Company

USPTO Granted Patents = 16

Trademarks = 1

Forward Citations = 150

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13 inventors (with patents filed for the assignee):

Thomas C Piotrowski (5 out of 5 patents)

William J Zehr (5 out of 5 patents)

Dwight E Brooker (3 out of 3 patents)

4. Martin Clift (3 out of 3 patents)

5. Baohai Liu (2 out of 2 patents)

6. Harry N Shaw (2 out of 2 patents)

7. Daomin Hong (1 out of 6 patents)

8. Lewis Bingham (1 out of 6 patents)

9. Christian A Mutzbauer (1 out of 1 patent)

10. Scott R Diaz (1 out of 1 patent)

11. David Johnson (1 out of 1 patent)

12. Daryl Johnson (1 out of 1 patent)

13. Dennis M Johnson (1 out of 9 patents)

16 patents: Sort by Forward Citations

1. 12498050 - Valve apparatus (2025-12-16),

2. 8317049 - Vacuum breaker arrangement with externally protruding collapsible valve part (2012-11-27),

3. 7390190 - Flame arrestor with reflection suppressor (2008-06-24),

4. 7056114 - Flame arrestor with reflection suppressor (2006-06-06),

5. 6644961 - Flame arrestor with reflection suppressor (2003-11-11),

6. 6629621 - Gauge hatch with liquid seal (2003-10-07),

7. 6244457 - Gauge hatch with diaphragm and liquid seal (2001-06-12),

8. 6056005 - Vent valve with liquid seal (2000-05-02),

9. 5795043 - Corrosion-resistant storage cabinet (1998-08-18),

10. 5660204 - Tank blanketing valve (1997-08-26),

11. 4280679 - Dually-operated tank car bottom unloading valve (1981-07-28),

12. 4249563 - Manifold for replacing relief valves (1981-02-10),

13. 4182384 - Fire extinguisher discharge station (1980-01-08),

14. 4138037 - Tilt can (1979-02-06),

15. 4121632 - Fire extinguisher cylinder filling station (1978-10-24),

The Protectoseal Company is a leading manufacturer of quality safety products for the storage and handling of flammable and combustible liquids. With over 90 years of experience, Protectoseal offers a wide range of products including flame arresters, tank vents, and emergency pressure relief vents. Their innovative solutions are designed to protect personnel, property, and the environment from the dangers of fire and explosion.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

16 Patents

#3 in Bensenville, IL

#975 in Illinois

#19,310 in US

#36,676 in the World

Bensenville, IL, United States of America

The Protectoseal Company

Forward Citations = 150

13 inventors:

Thomas C Piotrowski (5 out of 5 patents)

William J Zehr (5 out of 5 patents)

Dwight E Brooker (3 out of 3 patents)

4. Martin Clift (3 out of 3 patents)

5. Baohai Liu (2 out of 2 patents)

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