Assignee
KOPPERS IND INC
US·4 granted patents·143 citations·filing 1988–1998
Top patents by PatentIndex Score
4 records- 0186US5746906ACoal tar pitch blend having low polycyclic aromatic hydrocarbon content and method of making thereofKOPPERS IND INC·Filed 1995·Granted May 5, 1998·89 cites·71 claims
- 0269US6033166ARail milling machineKOPPERS IND INC·Filed 1998·Granted Mar 7, 2000·42 cites·36 claims
- 0330US4892249ARailroad grade crossing with improved transverse spline and anchoring assemblyKOPPERS IND INC·Filed 1988·Granted Jan 9, 1990·4 cites·14 claims
- 0429US4899932ACapped highway grade crossingKOPPERS IND INC·Filed 1988·Granted Feb 13, 1990·8 cites·11 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →