Patent assignee · US · COMPANY

KOPPERS DELAWARE, INC.

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17Patents
15Active
17Granted
51Portfolio score

Filing activity: May 9, 2002 → Sep 8, 2022 · 4 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US8113441B2 Lap joint Emerging Cross-Sectional Technologies 5 Active
US8042747B2 Notched tie plate insulator Fixed Constructions 3 Active
US7066997B2 Coal tar and hydrocarbon mixture pitch and the preparation and use thereof Chemistry; Metallurgy 2 Expired
US8302878B2 Method and arrangement to insulate rail ends Fixed Constructions 2 Active
US9103074B1 Modular insulated tie plate Fixed Constructions 2 Active
US7465387B2 Coal tar and hydrocarbon mixture pitch and the preparation and use thereof Chemistry; Metallurgy 2 Expired
US8777121B2 Lap joint Emerging Cross-Sectional Technologies 1 Active
US8123144B2 Rail joint bars and rail joint assemblies Fixed Constructions 1 Active
US9328464B2 Single bend rail Fixed Constructions 1 Active
US11041274B2 Center supported bond joint Fixed Constructions 0 Active
US11624029B2 Heat treatment process for increased pitch yields Chemistry; Metallurgy 0 Active
US12394787B2 Dispersion of coal tar pitch for coating graphitic materials and use in Li-ion battery electrode production Emerging Cross-Sectional Technologies 0 Active
USD885977S1 Anti-rail rollover device General 0 Active
US10961665B2 Rail joint assembly having forged rail joint bars Fixed Constructions 0 Active
US12037750B2 Gauge plate insulator Fixed Constructions 0 Active
US11248172B2 Heat treatment process and system for increased pitch yields Chemistry; Metallurgy 0 Active
US11898101B2 Method and apparatus for continuous production of mesophase pitch Performing Operations; Transporting 0 Active

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.