Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4449189 | Personal access control system using speech and face recognition | Hartwig Ruell | 1984-05-15 |
| 4358677 | Transducer for fingerprints and apparatus for analyzing fingerprints | Hartwig Ruell | 1982-11-09 |