KOPPERS, INC.
🏢 View company profile →300Patents
0Active
300Granted
41Portfolio score
Filing activity: Aug 7, 1969 → May 15, 1986
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3984289A | Coke quencher car apparatus | Chemistry; Metallurgy | 106 | Expired |
| US3930961A | Hooded quenching wharf for coke side emission control | Chemistry; Metallurgy | 97 | Expired |
| US3963582A | Method and apparatus for suppressing the deposition of carbonaceous material in a coke oven battery | Chemistry; Metallurgy | 95 | Expired |
| US4083753A | One-spot coke quencher car | Chemistry; Metallurgy | 92 | Expired |
| US4366029A | Pivoting back one-spot coke car | Chemistry; Metallurgy | 91 | Expired |
| US4213489A | One-spot coke quench car coke distribution system | Chemistry; Metallurgy | 90 | Expired |
| US4527488A | Coke oven charging car | Chemistry; Metallurgy | 89 | Expired |
| US4265868A | Production of carbon monoxide by the gasification of carbonaceous materials | Emerging Cross-Sectional Technologies | 78 | Expired |
| US3981758A | Process control system for corrugators | Performing Operations; Transporting | 70 | Expired |
| US4197092A | High pressure coal gasifier feeding apparatus | Emerging Cross-Sectional Technologies | 54 | Expired |
| US4604491A | Synthetic oils | Chemistry; Metallurgy | 50 | Expired |
| US3936295A | Bearing members having coated wear surfaces | Emerging Cross-Sectional Technologies | 47 | Expired |
| US3990948A | Apparatus for cleaning the bottom surface of a coke oven door plug | Chemistry; Metallurgy | 46 | Expired |
| US4493286A | Method and apparatus for applying a multi-component adhesive | Performing Operations; Transporting | 46 | Expired |
| US4336107A | Aligning device | Chemistry; Metallurgy | 41 | Expired |
| US4133766A | Filter media support and containment system | Performing Operations; Transporting | 39 | Expired |
| US4179043A | Rotary valve apparatus | Performing Operations; Transporting | 38 | Expired |
| US3959209A | Curable solid polyester resins | Emerging Cross-Sectional Technologies | 36 | Expired |
| US3990513A | Method of solution mining of coal | Fixed Constructions | 30 | Expired |
| US3938814A | Bearing member having a wear resistant coating on its bearing face | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4285271A | Seal plate drive for use with apparatus for pressure feeding and pressure cooking a food product | Human Necessities | 24 | Expired |
| US3952637A | Apparatus for changing the rotary position of a slotter member and for changing the relative position between fixed and movable knives on the slotter member | Emerging Cross-Sectional Technologies | 24 | Expired |
| US3938674A | Method and apparatus for stacking paperboard blanks | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4608408A | Phenol-HCHO-resorcinol resins for use in forming fast curing wood laminating adhesives | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4385039A | Process for removal of sulfur oxides from waste gases | Performing Operations; Transporting | 22 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.