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For the Inventor, By the Inventor

Portland, OR, United States of America

Esco Corp.


USPTO Granted Patents = 177

% Expired Patents = 9.6



Trademarks = 2

Forward Citations = 5,628

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160 inventors (with patents filed for the assignee):

goldMedal Terry Lee Briscoe (38 out of 42 patents)

silverMedal Christopher M Carpenter (25 out of 44 patents)

bronzeMedal Larren F Jones (22 out of 22 patents)

4.  Robert K Emrich (14 out of 15 patents)

5.  Charles George Ollinger (14 out of 18 patents)

6.  Frederick C Hahn (14 out of 15 patents)

7.  Donald M Conklin (10 out of 16 patents)

8.  Robert McClanahan (9 out of 9 patents)

9.  Severn D Durand (8 out of 11 patents)

10.  James E Bearden (8 out of 9 patents)

11.  David M Graf (7 out of 9 patents)

12.  Kevin S Stangeland (6 out of 11 patents)

13.  Robert S Fleck (6 out of 6 patents)

14.  John S Kreitzberg (6 out of 6 patents)

15.  Dziugas Radzius (5 out of 6 patents)


Core Competencies:
Wear Assembly
Excavating Equipment
Coupling Assembly
Wear Member
Dredge Cutterhead
Shredder Hammers
Mineral Winning Pick
Lock Assembly
Dragline Bucket
Wear Part Monitoring
Pinned Connections
Torque Locking System

177 patents:

1. 10030367 - Wear member for earth working equipment (2018-07-24),
2. 10024036 - Lock for a wear assembly (2018-07-17),
3. 10024033 - Wear part monitoring (2018-07-17),
4. 10022724 - Stepped shredder hammers (2018-07-17),
5. 10011975 - Monitoring ground-engaging products for earth working equipment (2018-07-03),
6. 9963853 - Lip for excavating bucket (2018-05-08),
7. 9915148 - Mineral winning pick, holder, and combination (2018-03-13),
8. 9855560 - Hammer for shredding machines (2018-01-02),
9. 9816254 - Wear assembly for use on earth working equipment (2017-11-14),
10. D792488 - Hammer for shredding machines (2017-07-18),
11. 9670649 - Wear part monitoring (2017-06-06),
12. 9650764 - Wear assembly for use on earth working equipment (2017-05-16),
13. 9561562 - Hardfaced wearpart using brazing and associated method and assembly for manufacturing (2017-02-07),
14. 9512600 - Coupling assemblies with enhanced take up (2016-12-06),
15. 9493930 - Lock for securing a wear assembly to excavating equipment (2016-11-15),
Esco Corp, headquartered in Portland, Oregon, specializes in wear parts technology, focusing on the development and manufacturing of high-performance components for various industries. The company is renowned for its innovative solutions in wear assembly, excavating equipment, and coupling assemblies, catering to sectors such as mining, construction, and dredging. Esco's expertise extends to products like dredge cutterheads, shredder hammers, and mineral winning picks, emphasizing durability and efficiency in demanding applications.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Esco Corp.
177 Patents

#6 in Portland, OR

#24 in Oregon

#2,280 in US

#4,697 in the World

Portland, OR (US)
Portland, OR, United States of America

Esco Corp.

Forward Citations = 5,628

160 inventors:

goldMedal Terry Lee Briscoe (38 out of 42 patents)

silverMedal Christopher M Carpenter (25 out of 44 patents)

bronzeMedal Larren F Jones (22 out of 22 patents)

4.  Robert K Emrich (14 out of 15 patents)

5.  Charles George Ollinger (14 out of 18 patents)

Please report any incorrect information to [email protected]
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