Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362604 | Process for the preparation of pyrocatechol and hydroquinone | Helmut Waldmann, Jurgen Baumert, Gunther Schummer | 1982-12-07 |
| 4324925 | Process for the preparation of polyhydric phenols | Helmut Waldmann, Hermann Seifert | 1982-04-13 |