Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5673481 | Air grid for underdrains and similar systems | R. Lee Roberts, Andrew Scott Taylor | 1997-10-07 |
| 5534202 | Air grid for underdrains and similar systems | R. Lee Roberts, Andrew Scott Taylor | 1996-07-09 |
| 5413710 | Lateral underdrain | R. Lee Roberts | 1995-05-09 |
| 5061080 | Rotary agitator | Donald John Mackay, R. Lee Roberts | 1991-10-29 |
| 4750999 | Filter employing barrier | Robert L. Roberts | 1988-06-14 |