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For the Inventor, By the Inventor

Perry, OK, United States of America

The Charles Machine Works, Inc.


USPTO Granted Patents = 365



Trademarks = 55

Forward Citations = 4,280

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220 inventors (with patents filed for the assignee):

goldMedal Cody L Sewell (76 out of 76 patents)

silverMedal Scott Bryan Cole (42 out of 43 patents)

bronzeMedal Greg Lowell Slaughter, Jr (31 out of 31 patents)

4.  Floyd R Gunsaulis (28 out of 29 patents)

5.  Michael F Gard (26 out of 44 patents)

6.  Brant Douglas Kukuk (26 out of 26 patents)

7.  Arthur D Deken (21 out of 21 patents)

8.  Brian K Bailey (18 out of 18 patents)

9.  Kelvin P Self (18 out of 19 patents)

10.  Max Allen Metcalf (17 out of 17 patents)

11.  Richard Felix Sharp (14 out of 15 patents)

12.  Vernon T Stellman (13 out of 13 patents)

13.  Mark D Randa (13 out of 37 patents)

14.  Joseph G Greenlee (12 out of 12 patents)

15.  Michael C Walgren (12 out of 12 patents)


Core Competencies:
Adjustable Tracks
Dynamic Temperature Regulation
Modular Pipe Loader
Microtrencher Blade
Pipeline Following Sensor
Downhole Energy Harvesting
Augmented Reality System
GPS Assisted Locating
Virtual Brake System
Throttle Control System
Mechanical Disconnect
Utility Pipe Installation

365 patents:

1. 12496645 - Pipe slitter (2025-12-16),
2. 12460377 - Adjustable tracks (2025-11-04),
3. 12439493 - Dynamic temperature regulation system for a light head (2025-10-07),
4. 12435741 - Cylinder assembly for tilting a vacuum tank (2025-10-07),
5. 12410879 - Latch assembly for use with an inversion drum (2025-09-09),
6. 12404730 - Modular pipe loader assembly (2025-09-02),
7. D1089341 - Microtrencher blade (2025-08-19),
8. 12381588 - Noise minimization to communicate with a beacon (2025-08-05),
9. 12344465 - Bearing retention for vacuum tank linkage (2025-07-01),
10. 12312944 - Fretting-wear resistant beacon lid (2025-05-27),
11. 12312882 - Mechanical shuttle pipe gripper (2025-05-27),
12. 12286843 - Dual pipe drill head quick interchange joint (2025-04-29),
13. 12281726 - Pipe extraction assisted by pre-stressed strand (2025-04-21),
14. 12270265 - Mechanical disconnect for rotation drive (2025-04-08),
15. 12270263 - Dual rod assembly and collar installation method (2025-04-08),
The Charles Machine Works, Inc. is a leading manufacturer of underground construction equipment, including the world-renowned brand, Ditch Witch. With over 75 years of expertise, the company continues to innovate and provide solutions for the underground utility industry. Their equipment is used for various applications such as installing and maintaining underground pipelines, telecommunications cables, and utility systems. Charles Machine Works is dedicated to delivering quality products, exceptional customer service, and ensuring the efficiency and safety of underground construction projects.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 30 2025

365 Patents

#1 in Perry, OK

#4 in Oklahoma

#1,205 in US

#2,437 in the World

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Perry, OK, United States of America

The Charles Machine Works, Inc.

Forward Citations = 4,280

220 inventors:

goldMedal Cody L Sewell (76 out of 76 patents)

silverMedal Scott Bryan Cole (42 out of 43 patents)

bronzeMedal Greg Lowell Slaughter, Jr (31 out of 31 patents)

4.  Floyd R Gunsaulis (28 out of 29 patents)

5.  Michael F Gard (26 out of 44 patents)

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