Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12196000 | Cylinder lock with multiple, supplemental locking elements and associated key | Mark Benzie, Douglas E. Trent, Peter H. Field, Walter Dannhardt, Thomas Duckwall | 2025-01-14 |
| 11624206 | Lock cylinder and key with multiple, supplemental locking elements | Mark Benzie, Douglas E. Trent, Peter H. Field, Walter Dannhardt, Thomas Duckwall | 2023-04-11 |
| 11280111 | Operating a lock cylinder with multiple, supplemental locking elements | Mark Benzie, Douglas E. Trent, Peter H. Field, Walter Dannhardt, Thomas Duckwall | 2022-03-22 |