Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4334076 | Process for the preparation of sulfuric acid semiester ethylsulfonyl compounds of aminophenols, aminobenzanilides or phenylpyrazolones by esterification with sulfuric acid and/or sulfur trioxide in a kneader | Hans H. Steuernagel, Ernst Hoyer | 1982-06-08 |
| 4323497 | Water-soluble disazo dyestuffs | Ernst Hoyer, Rudolf Fass | 1982-04-06 |