For the Inventor, By the Inventor

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Big Spring, TX, United States of America

Permian Research Corporation

USPTO Granted Patents = 12

Forward Citations = 132

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11 inventors (with patents filed for the assignee):

Granville J Hahn (11 out of 29 patents)

Marion Johnson (3 out of 8 patents)

Sammy Kent Flud (2 out of 3 patents)

4. Allen C Bailey (1 out of 1 patent)

5. Richard D Antrim (1 out of 1 patent)

6. Douglas J Horton (1 out of 1 patent)

7. Richard L Abner, Jr (1 out of 1 patent)

8. Raleigh N Rutledge (1 out of 20 patents)

9. Ramiro V Ramoos (1 out of 1 patent)

10. Ramiro V Ramos (1 out of 1 patent)

11. Durward Rutledge (1 out of 1 patent)

12 patents: Sort by Forward Citations

1. 5200204 - Rotary extruder with integral auger feed assembly (1993-04-06),

2. 5045252 - Method and apparatus for controlling rotary extruder (1991-09-03),

3. 5033861 - Rotary extruder with internally heated rotor (1991-07-23),

4. 4990233 - Method for retarding mineral buildup in downhole pumps (1991-02-05),

5. 4974336 - Drying method (1990-12-04),

6. 4887907 - Rotary extruder with internally cooled rotor (1989-12-19),

7. 4879138 - Composition for plastic article with unitarily molded foam layer (1989-11-07),

8. 4872573 - Plastic closure with barrier coating (1989-10-10),

9. 4866100 - Composition for plastic article with unitarily molded foam layer (1989-09-12),

10. 4839969 - Drying method and apparatus (1989-06-20),

11. 4813863 - Rotary extruder with a gear pump (1989-03-21),

12. 4744478 - Plastic closure with unitarily molded, foamed sealing layer (1988-05-17),

Permian Research Corporation is a leading provider of geophysical and geological consulting services for the oil and gas industry. With a team of experts specializing in the Permian Basin region, we offer comprehensive solutions for exploration and development projects. Our services include seismic interpretation, well log analysis, reservoir modeling, and more. Visit our website to learn more about how we can help maximize your oil and gas investments.

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

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USPTO Data Jan 1 1976 - Dec 9 2025

12 Patents

#2 in Big Spring, TX

#1,565 in Texas

#24,779 in US

#46,665 in the World

Big Spring, TX, United States of America

Permian Research Corporation

Forward Citations = 132

11 inventors:

Granville J Hahn (11 out of 29 patents)

Marion Johnson (3 out of 8 patents)

Sammy Kent Flud (2 out of 3 patents)

4. Allen C Bailey (1 out of 1 patent)

5. Richard D Antrim (1 out of 1 patent)

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