Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4446763 | Mortice cylinder lock wrench structures | David L. Gregory | 1984-05-08 |
| 4447176 | Template for mortice cylinder lock removal | David L. Gregory | 1984-05-08 |
| 4379576 | Sliding closure security system | David L. Gregory | 1983-04-12 |
| 4309140 | Self-locking threaded fastener and unlocking tool combination | Robert G. Steffen, David L. Gregory | 1982-01-05 |
| 4307983 | Apparatus for gaining access to enclosures secured by cylinder locks with minimum damage to internal lock elements | David L. Gregory | 1981-12-29 |