Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874568 | Process of making a porous membrane | C. C. Chau | 1989-10-17 |
| 4873037 | Method for preparing an asymmetric semi-permeable membrane | C. C. Chau, Otto C. Raspor, Lu H. Tung | 1989-10-10 |
| 4806439 | Temporary barrier layer in batteries | Ritchie A. Wessling | 1989-02-21 |