Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883593 | Ultrathin-skinned asymmetric membranes by immiscible solvents treatment | Dwayne T. Friesen | 1989-11-28 |
| 4876287 | Selective ion-complexing media for the removal of metal-ion contaminants from plating baths | Dwayne T. Friesen | 1989-10-24 |