Trademarks = 3

Forward Citations = 70

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7 inventors (with patents filed for the assignee):

S Hudson Owen (2 out of 12 patents)

William E Saver (1 out of 4 patents)

E Ronald McHenry (1 out of 2 patents)

4. Barry Francis Hampel (1 out of 1 patent)

5. Dale K Beachy (1 out of 1 patent)

6. Robert B Dehls (1 out of 1 patent)

7. James H Simpson (1 out of 1 patent)

4 patents: Sort by Forward Citations

1. 6033166 - Rail milling machine (2000-03-07),

2. 5746906 - Coal tar pitch blend having low polycyclic aromatic hydrocarbon content (1998-05-05),

3. 4899932 - Capped highway grade crossing (1990-02-13),

4. 4892249 - Railroad grade crossing with improved transverse spline and anchoring (1990-01-09),

Koppers is a leading integrated producer of carbon compounds and wood treatment products. With operations worldwide, the company serves a diverse range of industries including aluminum, steel, chemical, railroad, utility, and construction. Koppers is committed to sustainability and innovation in providing high-quality products and services to its customers.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

4 Patents

#291 in Pittsburgh, PA

#2,184 in Pennsylvania

#59,001 in US

Pittsburgh, PA, United States of America

Koppers Industries, Inc.