Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881977 | Water-soluble yellow monoazo dyestuffs | Willi Steckelberg, Josef Ritter | 1989-11-21 |
| 4871754 | Aqueous formulation of 1,2-benzisothiazolin-3-one | Willi Steckelberg | 1989-10-03 |
| 4810254 | Wet-fastness properties of sulphur dyestuffs dyeings on cellulose treated with poly-di-allyl-ammonium salt | Karl-Heinz Keil, Gert Nagl, Manfred Kaiser, Joachim Steinbach, Klaus Sternberger | 1989-03-07 |