Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6098777 | Method and apparatus for discriminating different coins in free fall | Kirk D. Hoffman, Robert Huizenger | 2000-08-08 |
| 5823315 | Coin detector and identifier apparatus and method | Kirk D. Hoffman, Robert Huizenger | 1998-10-20 |
| 5568855 | Coin detector and identifier apparatus and method | Kirk D. Hoffman, Robert Huizenger | 1996-10-29 |