Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5631460 | Sorting machine using dual frequency optical detectors | Calvin G. Gray | 1997-05-20 |
| 5508512 | Sorting machine using dual frequency optical detectors | Calvin G. Gray | 1996-04-16 |