Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5225068 | Method of compacting an anodically produced layer of oxide on parts of aluminum or aluminum alloy | Klaus-Dieter Bartkowski | 1993-07-06 |
| 5102508 | Method of producing colored surfaces on parts of aluminum or aluminum alloy | Klaus-Dieter Bartkowski | 1992-04-07 |
| 5009756 | Chemical method of avoiding a rainbow effect caused by the layer of oxide produced upon the brightening of parts of aluminum or aluminum alloys | Klaus-Dieter Bartkowski | 1991-04-23 |
| 4995951 | Brightening method | — | 1991-02-26 |