Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4974193 | Circuit arrangement for protecting access to a data processing system with the assistance of a chip card | Albrecht Beutelspacher, Dietrich Kruse | 1990-11-27 |
| 4951247 | Data exchange system comprising a plurality of user terminals each containing a chip card reading device | Dietrich Kruse, Albrecht Beutelspacher | 1990-08-21 |
| 4786790 | Data exchange system with authentication code comparator | Dietrich Kruse, Albrecht Beutelspacher | 1988-11-22 |