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For the Inventor, By the Inventor

Ann Arbor, MI, United States of America

Thetford Corporation


USPTO Granted Patents = 123

% Expired Patents = 8.9


Trademarks = 25

Forward Citations = 1,457

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92 inventors (with patents filed for the assignee):

goldMedal John M Antos (45 out of 45 patents)

silverMedal Charles L Sargent (25 out of 36 patents)

bronzeMedal George Grech (17 out of 17 patents)

4.  John Robert Selina (13 out of 35 patents)

5.  Frank T Sargent (13 out of 23 patents)

6.  David B Cameron (10 out of 13 patents)

7.  Arthur W Henke (10 out of 12 patents)

8.  Michael B Fritz (9 out of 10 patents)

9.  Jason Smith (8 out of 27 patents)

10.  Brian Kelly (8 out of 8 patents)

11.  John A Hoffman (8 out of 9 patents)

12.  Thomas Cornille (7 out of 7 patents)

13.  Mark D Good (7 out of 25 patents)

14.  James Kenneth Miller (7 out of 7 patents)

15.  Kenneth J Hall (6 out of 7 patents)


Core Competencies:
Flush Toilet
Portable Waste Tank
Sanitary System
Wastewater Drainage
Recreational Vehicle Toilet
Induction Unit
Absorption Refrigerator
Dual Diaphragm Pump
Waste Treatment
Nitrate Deodorant
Sealing Member
Control System

123 patents:

1. D1089612 - Extraction unit for a cooking system (2025-08-19),
2. D1045492 - Induction unit for a cooking system (2024-10-08),
3. 9908122 - Waste fluid holding tank drain system and method (2018-03-06),
4. 9644143 - Working material for an absorption cooling machine (2017-05-09),
5. 9250011 - Absorption refrigerator with temperature control (2016-02-02),
6. 9080323 - Sealing member for a flush toilet (2015-07-14),
7. 8997268 - Flush toilet control system and related method (2015-04-07),
8. 8984675 - Control system for a plurality of toilets and related method (2015-03-24),
9. 8826939 - Drain system (2014-09-09),
10. 8777434 - Refrigerator with externally mounted lighting (2014-07-15),
11. 8672177 - Portable waste transfer tank (2014-03-18),
12. 8656963 - Vehicle wastewater drainage system (2014-02-25),
13. 8529223 - Dual diaphragm pump assembly for a sanitation system (2013-09-10),
14. 8516622 - Sanitary system for a vehicle including a removable holding tank (2013-08-27),
15. 8276218 - Macerator toilet (2012-10-02),
Thetford Corporation, headquartered in Ann Arbor, Michigan, specializes in innovative sanitary systems primarily for the recreational vehicle and marine industries. The company develops a range of products including flush toilets, portable waste tanks, and advanced wastewater drainage solutions. Its expertise extends to absorption refrigerators and dual diaphragm pumps, ensuring efficient and reliable performance in mobile sanitation. Thetford is committed to enhancing user experience through continuous innovation in sanitary technology.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Thetford Corporation
123 Patents

#3 in Ann Arbor, MI

#129 in Michigan

#3,149 in US

#6,499 in the World

Ann Arbor, MI (US)
Ann Arbor, MI, United States of America

Thetford Corporation

Forward Citations = 1,457

92 inventors:

goldMedal John M Antos (45 out of 45 patents)

silverMedal Charles L Sargent (25 out of 36 patents)

bronzeMedal George Grech (17 out of 17 patents)

4.  John Robert Selina (13 out of 35 patents)

5.  Frank T Sargent (13 out of 23 patents)

Please report any incorrect information to [email protected]
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