For the Inventor, By the Inventor

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Oklahoma City, OK, United States of America

Kerr-Mcgee Coal Corporation

USPTO Granted Patents = 14

Forward Citations = 171

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18 inventors (with patents filed for the assignee):

Weldon K Johnson (4 out of 4 patents)

John A Campbell (3 out of 3 patents)

Virgil J Barczak (3 out of 6 patents)

4. Robert E Leonard (2 out of 19 patents)

5. John C Tompkins (2 out of 2 patents)

6. Robert L Elder (1 out of 1 patent)

7. Tony G Gardner (1 out of 1 patent)

8. Jerry L Hughes (1 out of 1 patent)

9. Kenneth E Krause (1 out of 1 patent)

10. Ronald K Pepper (1 out of 1 patent)

11. Roger A Baldwin (1 out of 22 patents)

12. Jack L Moon (1 out of 3 patents)

13. Paul R Graham (1 out of 2 patents)

14. Amzi Gossard (1 out of 1 patent)

15. Carl L Baldwin (1 out of 1 patent)

14 patents: Sort by Forward Citations

1. 5125230 - Soot removal from exhaust gas (1992-06-30),

2. 4908047 - Soot removal from exhaust gas (1990-03-13),

3. 4904154 - Loading system for railroad cars (1990-02-27),

4. 4746498 - Process for reducing gaseous sulfur dioxide content of flue gases by (1988-05-24),

5. 4702899 - Process for treating coal to reduce sulfur content in flue gases (1987-10-27),

6. 4645654 - Reducing sulfur content in flue gases produced by coal combustion (1987-02-24),

7. 4629392 - System for batch loading coal into railroad cars (1986-12-16),

8. 4460308 - Method for loading coal into railroad cars (1984-07-17),

9. 4417840 - Particulate material transfer system (1983-11-29),

10. 4396339 - Particulate material transfer system (1983-08-02),

11. 4299295 - Process for degasification of subterranean mineral deposits (1981-11-10),

12. 4290725 - Particulate material transfer system (1981-09-22),

13. 4277215 - Articulate material transfer system (1981-07-07),

14. 4273193 - Process for use in degasification of subterranean mineral deposits (1981-06-16),

Kerr-McGee Coal Corporation, based in Oklahoma City, specializes in the exploration, extraction, and processing of coal resources. The company is recognized for its commitment to sustainable mining practices and innovation in coal technology. With a focus on enhancing energy production while minimizing environmental impact, Kerr-McGee plays a significant role in the energy sector. Its operations are primarily concentrated in the United States, contributing to the nation's energy supply through responsible resource management.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Oct 6 2026

14 Patents

#20 in Oklahoma City, OK

#100 in Oklahoma

#22,302 in US

#42,199 in the World

Oklahoma City, OK, United States of America

Kerr-Mcgee Coal Corporation

Forward Citations = 171

18 inventors:

Weldon K Johnson (4 out of 4 patents)

John A Campbell (3 out of 3 patents)

Virgil J Barczak (3 out of 6 patents)

4. Robert E Leonard (2 out of 19 patents)

5. John C Tompkins (2 out of 2 patents)

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