For the Inventor, By the Inventor

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Bensenville, IL, United States of America

The Protectoseal Company

USPTO Granted Patents = 15

Trademarks = 1

Forward Citations = 150

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

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

9. David Johnson (1 out of 1 patent)

10. Daryl Johnson (1 out of 1 patent)

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

15 patents: Sort by Forward Citations

1. 8317049 - Vacuum breaker arrangement with externally protruding collapsible valve part (2012-11-27),

2. 7390190 - Flame arrestor with reflection suppressor (2008-06-24),

3. 7056114 - Flame arrestor with reflection suppressor (2006-06-06),

4. 6644961 - Flame arrestor with reflection suppressor (2003-11-11),

5. 6629621 - Gauge hatch with liquid seal (2003-10-07),

6. 6244457 - Gauge hatch with diaphragm and liquid seal (2001-06-12),

7. 6056005 - Vent valve with liquid seal (2000-05-02),

8. 5795043 - Corrosion-resistant storage cabinet (1998-08-18),

9. 5660204 - Tank blanketing valve (1997-08-26),

10. 4280679 - Dually-operated tank car bottom unloading valve (1981-07-28),

11. 4249563 - Manifold for replacing relief valves (1981-02-10),

12. 4182384 - Fire extinguisher discharge station (1980-01-08),

13. 4138037 - Tilt can (1979-02-06),

14. 4121632 - Fire extinguisher cylinder filling station (1978-10-24),

15. 4006780 - Rupturing head for fire extinguishers (1977-02-08),

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.

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USPTO Data Jan 1 1976 - Dec 9 2025

15 Patents

#3 in Bensenville, IL

#1,021 in Illinois

#20,400 in US

#38,669 in the World

Bensenville, IL, United States of America

The Protectoseal Company

Forward Citations = 150

11 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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