Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6068926 | Carbon brush and process for impregnating same | Rainer Sperling, Gunter Schardt | 2000-05-30 |
| 5798178 | Carbon brush and process for impregnating same | Rainer Sperling, Gunter Schardt | 1998-08-25 |