Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6178789 | Convertible cylinder lock | Burl Finkelstein | 2001-01-30 |
| 5979949 | Sliding door latch with lock-out protection | Burl Finkelstein | 1999-11-09 |
| D324480 | Dropbolt lock | Peter H. Field | 1992-03-10 |
| 5044181 | Dropbolt lock assembly | Peter H. Field | 1991-09-03 |
| 5010745 | High security post lock | Charles E. Hall | 1991-04-30 |
| 4829798 | Combination switch lock/cam lock assembly | — | 1989-05-16 |
| 4688409 | Drop-bolt door lock assembly | Ronald N. Oliver | 1987-08-25 |
| 4617811 | Mechanism for operating a drop-bolt door lock | — | 1986-10-21 |
| 4552001 | High security T-handle assembly | — | 1985-11-12 |