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For the Inventor, By the Inventor

Pittsburgh, PA, United States of America

Jennmar Corporation


USPTO Granted Patents = 74


Trademarks = 17

Forward Citations = 832

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41 inventors (with patents filed for the assignee):

goldMedal John C Stankus (54 out of 77 patents)

silverMedal Frank Calandra, Jr (35 out of 35 patents)

bronzeMedal John G Oldsen (28 out of 49 patents)

4.  Eugene H Stewart (12 out of 12 patents)

5.  Brian R Castle (9 out of 12 patents)

6.  Jerry E Frease (7 out of 7 patents)

7.  Paul A Yacisin (6 out of 6 patents)

8.  Kendal L Taylor (5 out of 5 patents)

9.  Demrey Brandon (4 out of 11 patents)

10.  Jack R Eaton (4 out of 4 patents)

11.  Stanley Ponce (3 out of 3 patents)

12.  Glen S Grissinger (3 out of 3 patents)

13.  Song Guo (3 out of 3 patents)

14.  Michael Cokus (2 out of 2 patents)

15.  Mike Cokus (2 out of 2 patents)


Core Competencies:
Mine Roof Support
Cable Bolt
Yieldable Prop
Roof Control System
Truss Shoe
Hydraulic Tensioner
Combination Bolt System
Reinforcing Rod
Roof Instability Rating
Grit Surface Products
Expansion Anchor
Monitoring Systems

74 patents:

1. 7708087 - Countersink roof bit drill and method for using the same (2010-05-04),
2. 7566189 - Mine roof bolt with resin control surface (2009-07-28),
3. 7562550 - Cable bulbing apparatus and method for forming bulbs in a cable bolt (2009-07-21),
4. 7445408 - Yieldable prop having a restraint arrangement (2008-11-04),
5. 7390147 - Yieldable prop having a yield section (2008-06-24),
6. 7360971 - Yieldable prop (2008-04-22),
7. 7334968 - Yieldable prop (2008-02-26),
8. 7296950 - Point anchor coated mine roof bolt (2007-11-20),
9. 7284933 - Square embossed roof and rib plate (2007-10-23),
10. 7261494 - Truss shoe (2007-08-28),
11. 7134810 - Yieldable prop having a yield section (2006-11-14),
12. 7114888 - Yieldable prop (2006-10-03),
13. 7073982 - Point anchor coated mine roof bolt (2006-07-11),
14. 6832165 - Method of roof instability rating (2004-12-14),
15. 6619888 - Flange nut for mine roof bolt (2003-09-16),
Jennmar Corporation is a leading provider of ground control solutions for underground mining, tunneling, and civil construction industries. With a global presence, Jennmar Corporation offers comprehensive products, systems, and services that ensure safety and productivity in challenging work environments.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 23 2025

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74 Patents

#31 in Pittsburgh, PA

#182 in Pennsylvania

#4,753 in US

#9,715 in the World

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Pittsburgh, PA, United States of America

Jennmar Corporation

Forward Citations = 832

41 inventors:

goldMedal John C Stankus (54 out of 77 patents)

silverMedal Frank Calandra, Jr (35 out of 35 patents)

bronzeMedal John G Oldsen (28 out of 49 patents)

4.  Eugene H Stewart (12 out of 12 patents)

5.  Brian R Castle (9 out of 12 patents)

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