Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5180563 | Treatment of industrial wastes | Wen-Chao Lai, William J. Rourke | 1993-01-19 |
| 5019362 | Ion exchange method for the purification of scandium | William J. Rourke | 1991-05-28 |
| 4988487 | Process for recovering metal values such as scandium, iron and manganese from an industrial waste sludge | Wen-Chao Lai, William J. Rourke | 1991-01-29 |
| 4898719 | Liquid extraction procedure for the recovery of scandium | William J. Rourke, Wen-Chao Lai | 1990-02-06 |
| 4816233 | Ion exchange method for the recovery of scandium | William J. Rourke, Wen-Chao Lai | 1989-03-28 |
| 4765909 | Ion exchange method for separation of scandium and thorium | William J. Rourke, Wen-Chao Lai | 1988-08-23 |
| 4619905 | Process for the synthesis of silicon nitride | Gary Czupryna | 1986-10-28 |
| 4604273 | Process for the growth of alpha silicon nitride whiskers | Gary Czupryna, Robert A. Long, Robin W. Munn | 1986-08-05 |
| 4374713 | Process for separating tungsten from coinage metals | Gary Czupryna | 1983-02-22 |
| 4374809 | Process for the separation of molybdenum values from tungsten values | Mark S. Chagnon, Joseph E. Lester | 1983-02-22 |
| 4374008 | Process for separating tungsten from coinage metals | Gary Czupryna | 1983-02-15 |
| 4328191 | Process for the recovery of molybdenum from spent catalysts | Sophia R. Su | 1982-05-04 |
| 4287159 | Extraction process for the recovery of tungsten from low level sources | Sophia R. Su | 1981-09-01 |
| 4279870 | Liquid-liquid extraction process for the recovery of tungsten from low level sources | Sophia R. Su | 1981-07-21 |
| 4278643 | Resin sorption process for extracting tungsten | Sophia R. Su | 1981-07-14 |