Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822489 | Aromatic polysulfone type resin hollow fiber membrane and a process for producing the same | Yasuo Hashino | 1989-04-18 |
| 4813983 | Composite membrane for use in gas separation | Toshibumi Fukai | 1989-03-21 |