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 = 170

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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 is a leading coal mining company focused on producing high-quality coal for energy production. With a strong commitment to safety and environmental stewardship, we strive to meet the energy needs of our customers while minimizing our impact on the environment. Our experienced team is dedicated to excellence in every aspect of our operations, from mining to transportation and logistics.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

14 Patents

#19 in Oklahoma City, OK

#94 in Oklahoma

#21,598 in US

#40,882 in the World

Oklahoma City, OK, United States of America

Kerr-mcgee Coal Corporation

Forward Citations = 170

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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