Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6835304 | Device for monitoring of a coolant regeneration system | Edward Eaton, Steven R. Knight | 2004-12-28 |
| 6475379 | Recharge and filter cartridge | Steven R. Knight | 2002-11-05 |
| 6235194 | Recharge and filter assembly with replaceable cartridge | — | 2001-05-22 |