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Shawnee, OK, United States of America

Central Plastics Company

USPTO Granted Patents = 18

Trademarks = 1

Forward Citations = 281

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10 inventors (with patents filed for the assignee):

James A Inhofe, Jr (4 out of 5 patents)

Harold J Evans (4 out of 4 patents)

Russel G Ramsey (3 out of 3 patents)

4. Dean E Eggleston (2 out of 2 patents)

5. Terry L Stiles (2 out of 2 patents)

6. Howard Wayne Hall (1 out of 4 patents)

7. Ernest Lever (1 out of 1 patent)

8. Richard E Springer (1 out of 1 patent)

9. Melvin E Pourchot (1 out of 1 patent)

10. Bobby W Sehorn (1 out of 1 patent)

18 patents: Sort by Forward Citations

1. 6896297 - Gas service riser assembly and ductile pipe to plastic pipe transition connection (2005-05-24),

2. 5988692 - Metal to plastic pipe transition fitting (1999-11-23),

3. 5988689 - Heat-shrinkable electrofusion fittings and methods (1999-11-23),

4. 5895543 - Clamping apparatus for an electrofusion joint (1999-04-20),

5. 5798021 - Clamping apparatus for an electrofusion joint (1998-08-25),

6. 5476562 - Large diameter electrically fusible pipe methods (1995-12-19),

7. 5252157 - Electrothermal fusion of large diameter pipes by electric heating wire (1993-10-12),

8. 4978837 - Method and apparatus for electrically heat welding thermoplastic fittings (1990-12-18),

9. 4894521 - Electric heating element for fusing thermoplastic materials (1990-01-16),

10. 4801159 - Anodeless riser assembly (1989-01-31),

11. 4713129 - Plastic pile protector and method of covering a pile with same (1987-12-15),

12. 4708527 - Plastic pile protector and method of covering a pile with same (1987-11-24),

13. 4684789 - Thermoplastic fitting electric welding method and apparatus (1987-08-04),

14. 4663794 - Plastic pipe scraper (1987-05-12),

15. 4642155 - Thermoplastic fitting electric heat welding method and apparatus (1987-02-10),

Central Plastics Company is a leading manufacturer of high-quality plastic products. With over 50 years of experience in the industry, we specialize in custom plastic extrusions and injection molding. Our state-of-the-art facilities and skilled team ensure that we consistently deliver top-notch products to our customers. At Central Plastics, we are committed to providing innovative solutions and exceptional service to meet the needs of our clients.

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

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USPTO Data Jan 1 1976 - Dec 16 2025

18 Patents

#1 in Shawnee, OK

#82 in Oklahoma

#17,390 in US

#33,165 in the World

Shawnee, OK, United States of America

Central Plastics Company

Forward Citations = 281

10 inventors:

James A Inhofe, Jr (4 out of 5 patents)

Harold J Evans (4 out of 4 patents)

Russel G Ramsey (3 out of 3 patents)

4. Dean E Eggleston (2 out of 2 patents)

5. Terry L Stiles (2 out of 2 patents)

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