Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874568 | Process of making a porous membrane | Jang-hi Im | 1989-10-17 |
| 4873037 | Method for preparing an asymmetric semi-permeable membrane | Jang-hi Im, Otto C. Raspor, Lu H. Tung | 1989-10-10 |