Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4345073 | 7,7'-Diamino derivatives of 2,2'-spirodibenzopyranes | Hans-Peter Baumann | 1982-08-17 |
| 4316027 | 7,7'-Diamino derivatives of 2,2'-spirodibenzopyranes | Hans-Peter Baumann | 1982-02-16 |