Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |