Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867853 | Process of producing phosphate coatings | Dieter Hauffe, Rainer Kuhna, Gerhard Muller, Helmut Schumichen | 1989-09-19 |
| 4849031 | Process of producing phosphate coatings on metal surfaces | Dieter Hauffe, Gisela Beege, Peter Mischke | 1989-07-18 |