Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6907994 | Process for converting wet fly ash into dry useful industrial products | William S. Bradley, Frank A. Elk, Riley D. Robbins | 2005-06-21 |
| 6666335 | Multi-mineral/ash benefication process and apparatus | William M. Bradley, Frank A. Elk, Riley D. Robbins, William Lewis, Robert M. Lewis | 2003-12-23 |