Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11658449 | Slipring with wear monitoring | Christian Holzapfel, Holger Steffens, Holger Häffner | 2023-05-23 |
| 8986053 | Slip ring brush and holder for slip ring brush | Christian Holzapfel, Peter Heinbuch | 2015-03-24 |