Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5647235 | Tamper-evident electronic combination lock having integral bearing/retaining member | Michael R. Clark | 1997-07-15 |
| 5095724 | Tumbler wheel scrambler for combination lock | — | 1992-03-17 |
| 4776187 | Changeable key cylinder exposed shackle padlock | Walter R. Evans | 1988-10-11 |
| 4776190 | Radiological detection resistant key changeable combination lock | Harry C. Miller, Stephen Helesfai, John Bishop | 1988-10-11 |
| 4763496 | High security changeable key cylinder type shackle padlock | Walter R. Evans | 1988-08-16 |