Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7788956 | Lock, key blank, and key of a hierarchical lock system | Peter H. Field | 2010-09-07 |
| 7552608 | Lock, key blank, and key of a hierarchical lock system | Peter H. Field | 2009-06-30 |
| 7412860 | Key blank and key | Peter H. Field | 2008-08-19 |