Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667599 | Process for forming a black oxide on aluminum alloys and a solution therefor | Robert Roy Ahrens, Mingguang Zhu | 1997-09-16 |
| 5601663 | Process for forming a black oxide on aluminum alloys and a solution therefor | Robert Roy Ahrens, Mingguang Zhu | 1997-02-11 |