Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7198698 | Method of photochemically removing ammonia from gas streams | John R. Richards | 2007-04-03 |
| 6770174 | Photochemical system and method for removal for formaldehyde from industrial process emissions | John R. Richards | 2004-08-03 |
| 6541677 | Photochemical system and method for the removal of PCDD or PCDF compounds from industrial process emissions | John R. Richards, Daniel M. Richards, Todd T. Brozell, Tommy E. Holder | 2003-04-01 |