Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4387252 | Process for the preparation of polyhydric phenols | Helmut Waldmann, Hermann Seifert | 1983-06-07 |
| 4381973 | Process for the preparation of pyrocatechol and hydroquinone | Helmut Waldmann, Jurgen Baumert, Gunther Schummer | 1983-05-03 |
| 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 |
| 4308112 | Process for the isolation of pyrocatechol and hydroquinone | Jurgen Baumert, Gunter Schummer | 1981-12-29 |