Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4459578 | Finger control joystick utilizing Hall effect | Roy J. Machamer | 1984-07-10 |
| 4429876 | Pinball machine and play feature thereof | Ronald D. Halliburton, James H. Pearson | 1984-02-07 |
| 4424970 | Panic post for pinball games | Ronald D. Halliburton, James H. Pearson | 1984-01-10 |