Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6171024 | Injection hopper for use in a material delivery system | Don Curtis | 2001-01-09 |
| 6152656 | Material delivery system | Don Curtis, William V. Rollins | 2000-11-28 |
| 6033154 | Waste processing attachment and method for environmentally treating a waste lagoon | Don Curtis | 2000-03-07 |