Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888106 | Method of using polymeric sulfide mineral depressants | David W. Lipp | 1989-12-19 |
| 4871466 | Novel collectors and processes for making and using same | Samuel S. Wang | 1989-10-03 |
| 4866150 | Polymeric sulfide mineral depressants | David W. Lipp | 1989-09-12 |