Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5220988 | Coin slide with magnetic slug attracting means | Evan C. Wilfong, John Duffy | 1993-06-22 |
| 5074396 | Coin slide | Evan C. Wilfong | 1991-12-24 |
| D317249 | Key | — | 1991-06-04 |
| 4828096 | Coin slide | Evan C. Wilfong | 1989-05-09 |
| 4802566 | Coin slide guard | Evan C. Wilfong | 1989-02-07 |
| 4499983 | Coin slide with coin drop delay means | John Duffy | 1985-02-19 |
| 4401202 | Coin slide with interchangeable cores | John Duffy | 1983-08-30 |
| 4350240 | Coin slide with interchangeable cores | John Duffy | 1982-09-21 |