Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857201 | Reverse osmosis cellulose and cellulosic membranes prepared by repeated drying and rewetting | Laura E. Black | 1989-08-15 |
| 4836927 | Recovery of dewaxing aid using asymmetric polyimide ultrafiltration membrane and method for producing said membrane | — | 1989-06-06 |