Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6510587 | Door closure prevention apparatus and method | Ned Urschel, Wilbur Carl Bewley, JR. | 2003-01-28 |
| 5613388 | Electronic combination lock entering a lockout mode after a number of successive incorrect combination entries | — | 1997-03-25 |
| 4643010 | Two movement time lock | Bert Krivec, Walter R. Evans | 1987-02-17 |
| 4631940 | Digital readout combination lock dial assembly | Bert Krivec | 1986-12-30 |
| 4359886 | Key lock cylinder for possibly contaminated environments | Walter R. Evans, Shelly M. Osborne | 1982-11-23 |