Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5173088 | Process for preparing crystals of anhydrous sodium sulfide | Yoshio Aoyama | 1992-12-22 |
| 5071632 | Process for preparing crystals of anhydrous sodium sulfide | Yoshio Aoyama | 1991-12-10 |
| 4908043 | Method of producing crystals of anhydrous sodium sulfide | Toshio Aoyama | 1990-03-13 |