Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5171547 | Recovery of chromium in high purity state from waste materials of etching operations | Andrew Case, Felix D. Rando, John D. Sweeney | 1992-12-15 |
| 4954168 | Reclaiming of aluminum-chromium waste materials from etching operations | Edward I. Wiewiorowski, Andrew Case | 1990-09-04 |
| 4670229 | Cyclic process for recovering metal values and alumina from spent catalysts | Edward I. Wiewiorowski, Luther R. Tinnin | 1987-06-02 |
| 4497659 | Production of metals with low selenium contents | Edward I. Wiewiorowski, Peter H. Yu | 1985-02-05 |
| 4214900 | Production of nonferrous metals with low selenium contents | Edward I. Wiewiorowski, Peter H. Yu | 1980-07-29 |