Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5164147 | Heat treating furnace | Norman L. Kotraba | 1992-11-17 |
| 5028034 | Continuous feed shaft retort appartus for recovery of non-ferrous metals | Norman G. Bishop, Norman L. Kotraba | 1991-07-02 |
| 4983214 | Method and apparatus for direct reduction of metal oxides | Norman L. Kotraba, Norman G. Bishop | 1991-01-08 |
| 4963182 | Continuous feed shaft retort process for recovery of non-ferrous metals from process dust | Norman G. Bishop, Norman L. Kotraba | 1990-10-16 |
| 4931090 | Pneumatic steelmaking vessel and method of producing steel | Norman L. Kotraba | 1990-06-05 |
| 4836847 | Method for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous | Norman G. Bishop, Norman L. Kotraba | 1989-06-06 |
| 4758268 | Method and apparatus for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous | Norman G. Bishop, Norman L. Kotraba | 1988-07-19 |