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Chardon, OH, United States of America

Essef Corporation

USPTO Granted Patents = 41

% Expired Patents = 7.3

Trademarks = 5

Forward Citations = 659

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36 inventors (with patents filed for the assignee):

James C Murphy (10 out of 12 patents)

Edward T LeBreton (7 out of 11 patents)

Robert D Wilkes (5 out of 5 patents)

4. Ronald B Robol (3 out of 35 patents)

5. James C Hlebovy (3 out of 10 patents)

6. Erik Coeckelbergs (3 out of 3 patents)

7. Gerald S Boyce (3 out of 3 patents)

8. Mark D Shaw (2 out of 56 patents)

9. J Tad Heyman (2 out of 42 patents)

10. Kevin Goodge (2 out of 3 patents)

11. Thomas G Carter (2 out of 10 patents)

12. Laurence M Bierce (2 out of 33 patents)

13. George S Ellis (2 out of 7 patents)

14. Steven C Suchanek (2 out of 2 patents)

15. Jim Hlebovy (2 out of 2 patents)

Core Competencies:

Pressure Vessel

Composite Pressure Vessels

Quick-Release Fitting

Filament Wound

Hydropneumatic

Thermoplastic

Sealing Technique

Regeneration System

Dynamic Pressure Relief

Water Filter

Swimming Pool Drain

Blow-Molded Tank

41 patents: Sort by Forward Citations

1. 7090736 - Pressure vessel prestressing technique (2006-08-15),

2. 7017771 - Pressure vessel (2006-03-28),

3. 6932391 - Quick-release fitting assembly (2005-08-23),

4. 6793095 - Blow-molded pressure tank with spin-welded connector (2004-09-21),

5. 6660214 - Pressure vessel manufacture method (2003-12-09),

6. 6565793 - Method for fabricating composite pressure vessels (2003-05-20),

7. 6485668 - Method for fabricating composite pressure vessels and products fabricated by the method (2002-11-26),

8. 6298553 - Composite pressure vessel with heat exchanger (2001-10-09),

9. 6190598 - Method for making thermoplastic composite pressure vessels (2001-02-20),

10. 6171423 - Method for fabricating composite pressure vessels (2001-01-09),

11. 5900107 - Fitting installation process and apparatus for a molded plastic vessel (1999-05-04),

12. 5878773 - Auxiliary flow path valve (1999-03-09),

13. 5866001 - Filament wound housing for a reverse osmosis filter cartridge (1999-02-02),

14. 5819978 - Two piece composite inlet (1998-10-13),

15. 5806705 - Sealing technique for hydropneumatic pressure vessel (1998-09-15),

Essef Corporation, based in Chardon, Ohio, specializes in the development and manufacturing of advanced pressure vessel technologies. The company focuses on composite pressure vessels, filament wound housing, and hydropneumatic pressure vessels, catering to various industrial applications. Essef is also known for its innovative quick-release fitting assemblies, blow-molded pressure tanks, and dynamic pressure relief seals. Additionally, the company offers regenerative diatomaceous earth filters, showcasing its commitment to providing efficient and reliable solutions in pressure management and filtration.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

41 Patents

#1 in Chardon, OH

#358 in Ohio

#8,433 in US

#16,686 in the World

Chardon, OH, United States of America

Essef Corporation

Forward Citations = 659

36 inventors:

James C Murphy (10 out of 12 patents)

Edward T LeBreton (7 out of 11 patents)

Robert D Wilkes (5 out of 5 patents)

4. Ronald B Robol (3 out of 35 patents)

5. James C Hlebovy (3 out of 10 patents)

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