Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6481360 | Ultra fine fly ash and a system for collecting the same | John Hume, R. F. Ridgeway | 2002-11-19 |
| 6447580 | Electrostatic precipitator | R. F. Ridgeway, John Hume | 2002-09-10 |
| 6398848 | Method of separating a low density fly ash fraction from an overall group of fly ash | R. F. Ridgeway, John Hume | 2002-06-04 |
| 6216612 | Ultra fine fly ash and a system for collecting the same | John Hume, R. F. Ridgeway | 2001-04-17 |