Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5069994 | Use of colorless, intensely fluorinated ammonium and iminium compounds as charge control agents for electrophotographic recording processes | Jorg Gitzel, Hans-Tobias Macholdt, Alexander Sieber, Frank Wehowsky | 1991-12-03 |
| 5053537 | Ammonium and iminium compounds | Jorg Gitzel, Hans-Tobias Macholdt, Frank Wehowsky | 1991-10-01 |