Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5690870 | Method of manufacturing a polyimide-type gas permeation membrane including fluorine | Ping Xu, Tomomi Ohara | 1997-11-25 |
| 5647894 | Gas separating composite membrane and process for producing the same | Tomomi Ohara, Ping Xu, Akira Shimazu, Kenichi Ikeda | 1997-07-15 |