Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4460447 | Apparatus for the galvanic deposition of aluminum | Siegfried Birkle, Johann Gehring | 1984-07-17 |
| 4455201 | Bath and method for anodizing aluminized parts | Siegfried Birkle, Hans De Vries | 1984-06-19 |
| 4439287 | Method for anodizing aluminum materials and aluminized parts | Siegfried Birkle, Hans De Vries | 1984-03-27 |
| 4435265 | Device for electro-deposition of aluminum | Siegfried Birkle, Johann Gehring | 1984-03-06 |
| 4427522 | Electrically insulating protective device | Siegfried Birkle, Johann Gehring, Hans De Vries | 1984-01-24 |
| 4417954 | Electrolyte for the electrodeposition of aluminum | Siegfried Birkle | 1983-11-29 |
| 4415422 | Apparatus for electro-depositing aluminum | Siegried Birkle, Johann Gehring | 1983-11-15 |