Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362740 | Spiro compounds, their production and use | Isuke Imada, Hirosada Sugihara | 1982-12-07 |
| 4342779 | 7-Acetylspirobenzofuranone compound | Hirosada Sugihara, Masazumi Watanabe, Isuke Imada | 1982-08-03 |
| 4330554 | Spirobenzofuranone compounds | Hirosada Sugihara, Masazumi Watanabe, Isuke Imada | 1982-05-18 |