Enter assignee name

% Expired Patents = 7.1

Forward Citations = 164

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3 inventors (with patents filed for the assignee):

Joseph P Sandman (13 out of 13 patents)

Michael N Sandman (13 out of 13 patents)

Harold P Reiland (1 out of 1 patent)

14 patents: Sort by Forward Citations

1. 10480812 - Damper access assembly, clamp assembly, and clamp member (2019-11-19),

2. 10012333 - Fluid conditioning devices and assemblies (2018-07-03),

3. 9551505 - Damper access assembly, clamp assembly, and clamp member (2017-01-24),

4. 9341291 - Damper access assembly (2016-05-17),

5. D737133 - Clamping member (2015-08-25),

6. D736072 - Clamping member (2015-08-11),

7. 8584497 - Flange-forming system for tube and related methods (2013-11-19),

8. 8322758 - Tube coupling and related methods (2012-12-04),

9. 7997112 - Flange-forming system for tube and related methods (2011-08-16),

10. 7523964 - Sealing gasket for ventilation duct system (2009-04-28),

11. D534253 - Gasket (2006-12-26),

12. D529598 - Portion of ductwork (2006-10-03),

13. D521147 - Portion of ductwork (2006-05-16),

14. 3965507 - Athlete's landing pit cushion (1976-06-29),

Langdon Incorporated is a leading construction company specializing in commercial and residential projects. With over 20 years of experience, we offer a full range of services including design, planning, construction, and project management. Our team of skilled professionals is dedicated to delivering high-quality workmanship and exceeding client expectations. Contact us today to discuss your construction needs.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

14 Patents

#84 in Cincinnati, OH

#940 in Ohio

#22,289 in US

#42,168 in the World

Cincinnati, OH, United States of America

Langdon Incorporated

Forward Citations = 164

3 inventors:

Joseph P Sandman (13 out of 13 patents)

Michael N Sandman (13 out of 13 patents)

Harold P Reiland (1 out of 1 patent)

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