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For the Inventor, By the Inventor

Oconomowoc, WI, United States of America

Earth Tool Company LLC

USPTO Granted Patents = 67

% Expired Patents = 17.9


Trademarks = 15

Forward Citations = 822

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10 inventors (with patents filed for the assignee):

goldMedal Steven W Wentworth (49 out of 76 patents)

silverMedal Robert F Crane (44 out of 70 patents)

bronzeMedal Mark D Randa (22 out of 38 patents)

4.  Paul W Hau (6 out of 9 patents)

5.  Walter George Thompson (5 out of 7 patents)

6.  Jon Scharrer (2 out of 4 patents)

7.  Kelvin C Aus (1 out of 5 patents)

8.  Craig Lawrence Noggle (1 out of 2 patents)

9.  Payce D Reynolds (1 out of 3 patents)

10.  Douglas Bruce Caraway (1 out of 16 patents)


Core Competencies:
Directional Drilling
Pipe Bursting
Pneumatic Impact Tool
Rod Pushing Machine
Cable Pulling Machine
Portable Winch
Ground Piercing Tool
Joint for Boring
Drill Bit
Reamer Assembly
Slip Style Rod Spinner
Pipe Slitting Apparatus

67 patents:

1. 10550989 - Latch assembly for use with an inversion drum (2020-02-04),
2. 10415722 - Split ring ram adapter with cam adjustment (2019-09-17),
3. 10246949 - Slip style rod spinner for pipe bursting machine (2019-04-02),
4. 10161201 - Powered slip actuation (2018-12-25),
5. D816456 - Gut hook bladed pipe slitter (2018-05-01),
6. 9915109 - Slip style rod spinner for pipe bursting machine (2018-03-13),
7. 9611696 - Directional drill hammer pullback device (2017-04-04),
8. 9574696 - Stepped load pull back using rams (2017-02-21),
9. 9566653 - Pipe slitter (2017-02-14),
10. 9512951 - Pipe slitting apparatus (2016-12-06),
11. 9328760 - Quick connect rods (2016-05-03),
12. 9169946 - Directional drill hammer pullback device (2015-10-27),
13. 8979435 - Rod pulling and pushing machine for pipe bursting (2015-03-17),
14. 8955613 - Pneumatic impact tool (2015-02-17),
15. 8955586 - Beacon assembly (2015-02-17),
Company Overview
Earth Tool Company LLC, based in Oconomowoc, Wisconsin, specializes in advanced technologies for directional drilling applications. The company focuses on developing and manufacturing innovative equipment such as pneumatic impact tools, rod pushing machines, and cable pulling machines. Their expertise extends to pipe bursting and ground piercing tools, catering to the needs of the utility and construction industries. Earth Tool is committed to enhancing the efficiency and effectiveness of underground installation processes through its cutting-edge solutions.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

67 Patents

#2 in Oconomowoc, WI

#132 in Wisconsin

#5,461 in US

#11,040 in the World

Oconomowoc, WI (US)
Oconomowoc, WI, United States of America

Earth Tool Company LLC

Forward Citations = 822

10 inventors:

goldMedal Steven W Wentworth (49 out of 76 patents)

silverMedal Robert F Crane (44 out of 70 patents)

bronzeMedal Mark D Randa (22 out of 38 patents)

4.  Paul W Hau (6 out of 9 patents)

5.  Walter George Thompson (5 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Earth Tool Company LLC. Retrieved from https://idiyas.com/company/earth-tool-company

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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