Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| H708 | Method of producing diacetone sorbose | Hitoshi Sawada, Masao Yokoyama | 1989-11-07 |
| 4778882 | Method of carrying out chemical dehydration reaction and an apparatus therefor | Masao Yokoyama, Toshiaki Dairaku | 1988-10-18 |