Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818387 | Sulfonated polysulfone composite semipermeable membranes and process for producing the same | Kenichi Ikeda, Shouichi Yamamoto | 1989-04-04 |
| 4799454 | Apparatus for forming a thin film | — | 1989-01-24 |