Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6489605 | Device to aid the orientation of blind and partially sighted people | Maria Ritz, Ludger Woste | 2002-12-03 |
| 6298010 | Orientation aid for the blind and the visually disabled | Maria Ritz, Ludger Woste | 2001-10-02 |