For the Inventor, By the Inventor

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Westborough, MA, United States of America

Emseal Joint Systems, Ltd.

USPTO Granted Patents = 37

% Expired Patents = 51.4

Trademarks = 8

Forward Citations = 1,684

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4 inventors (with patents filed for the assignee):

Lester Hensley (31 out of 34 patents)

Bill Witherspoon (21 out of 22 patents)

William Witherspoon (12 out of 13 patents)

4. Walter Jones (2 out of 2 patents)

Core Competencies:

Fire Resistant

Water Resistant

Expansion Joint

Seismic Joint

Precompressed Foam

Tunnel Systems

Flexible Seal

Movement-Compensating

37 patents: Sort by Forward Citations

1. 11459748 - Fire resistant expansion joint systems (2022-10-04),

2. 11180995 - Water and/or fire resistant tunnel expansion joint systems (2021-11-23),

3. 10941562 - Fire and water resistant expansion joint system (2021-03-09),

4. 10934704 - Fire and/or water resistant expansion joint system (2021-03-02),

5. 10934702 - Fire and water resistant expansion joint system (2021-03-02),

6. 10851542 - Fire and water resistant, integrated wall and roof expansion joint seal system (2020-12-01),

7. 10794056 - Water and/or fire resistant expansion joint system (2020-10-06),

8. 10787806 - Fire and/or water resistant expansion and seismic joint system (2020-09-29),

9. 10787805 - Fire and/or water resistant expansion and seismic joint system (2020-09-29),

10. 10570611 - Method of making a water resistant expansion joint system (2020-02-25),

11. 10544582 - Expansion joint system (2020-01-28),

12. 10519651 - Fire resistant tunnel expansion joint systems (2019-12-31),

13. 10422127 - Precompressed foam expansion joint system transition (2019-09-24),

14. 10316661 - Water and/or fire resistant tunnel expansion joint systems (2019-06-11),

15. 10179993 - Water and/or fire resistant expansion joint system (2019-01-15),

Emseal Joint Systems, Ltd. specializes in the design and manufacturing of advanced sealing solutions for construction and infrastructure applications. The company focuses on creating innovative products that address the challenges of movement and water intrusion in buildings and structures. With a commitment to quality and performance, Emseal serves a diverse range of markets, including commercial, industrial, and institutional sectors, primarily in North America and beyond.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

Emseal Joint Systems, Ltd.

37 Patents

#9 in Westborough, MA

#537 in Massachusetts

#9,241 in US

#18,238 in the World

Westborough, MA, United States of America

Emseal Joint Systems, Ltd.

Forward Citations = 1,684

4 inventors:

Lester Hensley (31 out of 34 patents)

Bill Witherspoon (21 out of 22 patents)

William Witherspoon (12 out of 13 patents)

4. Walter Jones (2 out of 2 patents)

Please report any incorrect information to [email protected]

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