Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879388 | Extraction of metal values | Peter M. Quan, David Stewart | 1989-11-07 |
| 4822880 | Process for the extraction of metal values and novel metal extractants | David P. Devonald, Peter M. Quan, David Stewart | 1989-04-18 |
| 4800145 | Substituted phthaloayanine photoconductor and charge transport phase | Peter J. Duggan | 1989-01-24 |