Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5327836 | Returning system for rail-borne transporting carts without self-driving means | Hubert Christ | 1994-07-12 |
| 5076172 | Returning system for rail-bound transport carts without internal drive | Erwin Grimm, Christian Rene Koch, Volker Hausler, Hubert Christ | 1991-12-31 |