Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5075453 | Process for producing aryloxy-substituted phosphazene derivatives | Shinichiro Ueyama, Yasuhiro Yoshikawa, Tetsuhiko Okamoto, Masayuki Furukawa, Tadaichi Nishikawa | 1991-12-24 |
| 4864048 | Process for preparing phosphonitrile compound having substituted hydroxyl group | Masaharu Kaneko, Tetsuhiko Okamoto | 1989-09-05 |
| 4795621 | Process for the preparation of phosphonitrile chloride oligomer | Tetsuhiko Okamoto, Shinichiro Ueyama | 1989-01-03 |
| 4522689 | Process for purifying phosphonitrile chlorides | Hiroshi Tanino, Tetsuhiko Okamoto, Shinichiro Ueyama, Takatoshi Tsumiyama | 1985-06-11 |