Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889923 | AZO compounds containing cyano and vinyl-sulfone groups, a process for their preparation and their use as dyestuffs | Hans J. Schladetsch | 1989-12-26 |
| 4849031 | Process of producing phosphate coatings on metal surfaces | Dieter Hauffe, Gisela Beege, Werner Rausch | 1989-07-18 |