Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7354375 | Transmission having multiple ratio planetary gear unit in series with an auxiliary gear unit | Johann Kirchhoffer, Ruediger Volkert | 2008-04-08 |
| 7198586 | Transmission having multiple ratio planetary gear unit in series with an auxiliary gear unit | Johann Kirchhoffer, Ruediger Volkert | 2007-04-03 |