Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4662197 | Magnetic lock | Jürgen Krühn | 1987-05-05 |
| 4653298 | Lock-key system | — | 1987-03-31 |
| 4608842 | Lock and key system | — | 1986-09-02 |
| 4325242 | Multi-level lock system and method | — | 1982-04-20 |
| 4222252 | Cylinder lock with a lock picking impediment | — | 1980-09-16 |
| 4221121 | Multi-level lock system and method | — | 1980-09-09 |
| 4213316 | Cylinder-lock mechanism and key means therefore | — | 1980-07-22 |