Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5186396 | Apparatus for spreading granular and liquid materials | John A. Doherty | 1993-02-16 |
| 5096125 | Apparatus for synchronized spreading of granular and liquid material | John A. Doherty | 1992-03-17 |
| 5069392 | Synchronized granular material and liquid spreading device with full hydraulic control | John A. Doherty | 1991-12-03 |