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Pittsburgh, PA, United States of America

Koppers Company, Inc.

USPTO Granted Patents = 297

Trademarks = 14

Forward Citations = 3,014

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213 inventors (with patents filed for the assignee):

Gerd Leston (23 out of 23 patents)

Nicholas P Greco (14 out of 14 patents)

Hans Dressler (10 out of 14 patents)

4. William T Gormley (7 out of 7 patents)

5. William E Wallace (7 out of 7 patents)

6. Michael M Calistrat (6 out of 6 patents)

7. George R Cain (6 out of 7 patents)

8. Glenn F Hyde (5 out of 10 patents)

9. John Wright (5 out of 5 patents)

10. Carl G Lindgren (5 out of 5 patents)

11. Gordon L Morgret (5 out of 5 patents)

12. Philip H Harju (5 out of 5 patents)

13. Stanley R Prew (5 out of 6 patents)

14. Eugene A Pasek (4 out of 18 patents)

15. Yoshiyuki Okamoto (4 out of 15 patents)

Core Competencies:

Arsenic Acid

Wooden Beams

Hydrogen Storage Materials

Biocides

Phenolic Resins

Synthetic Oils

Zirconium Alloys

Fluid-Bed Catalysts

Naphthalene-Oxidation Catalyst

Wood Impregnation

Coke Oven Technology

Multi-Component Adhesives

297 patents: Sort by Forward Citations

1. 4769230 - Process for preparation of arsenic acid (1988-09-06),

2. 4742663 - Concealed load distribution means for wooden beams (1988-05-10),

3. 4732320 - Railroad grade crossing with transverse securing splines (1988-03-22),

4. 4705879 - Long-chain alkylresorcinol phosphites (1987-11-10),

5. 4679658 - Gaff (1987-07-14),

6. 4679362 - Void plug lift insert assembly for a cast concrete product (1987-07-14),

7. 4663143 - Hydrogen storage materials of CeNi.sub.5-x Mn.sub.x alloys (1987-05-05),

8. 4661378 - Pavement dressing conditioner formed of tar, an aromatic solvent and a (1987-04-28),

9. 4656302 - Tris-(3-hydroxy-4,6-di-t-alkylphenyl) phosphites (1987-04-07),

10. 4656023 - Hyperstoichiometric zirconium-titanium-chromium iron alloys (1987-04-07),

11. 4645780 - Novel biocides employing resorcinol derivatives (1987-02-24),

12. 4642393 - Process for preparing 1,4-dihydroxy, 5,8-dihydronaphthalene and related (1987-02-10),

13. 4633022 - Process for preparation of trisubstituted phenols (1986-12-30),

14. 4619761 - Method for screening or fractionation (1986-10-28),

15. 4608408 - Phenol-HCHO-resorcinol resins for use in forming fast curing wood (1986-08-26),

Koppers Company, Inc. is a global provider of treated wood products, wood processing and specialty chemicals. With a history dating back over 100 years, Koppers operates in numerous industries including rail, utility, residential construction, and chemical manufacturing. The company specializes in developing and delivering innovative solutions for preserving and enhancing wood products. Koppers' commitment to sustainability and environmental responsibility increasingly shapes its operations and product offerings.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

297 Patents

#8 in Pittsburgh, PA

#54 in Pennsylvania

#1,414 in US

#2,914 in the World

Pittsburgh, PA, United States of America

Koppers Company, Inc.

Forward Citations = 3,014

213 inventors:

Gerd Leston (23 out of 23 patents)

Nicholas P Greco (14 out of 14 patents)

Hans Dressler (10 out of 14 patents)

4. William T Gormley (7 out of 7 patents)

5. William E Wallace (7 out of 7 patents)

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