Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7410572 | Combination particulate and acid-neutralizing filter | John H. Beard | 2008-08-12 |
| 7132047 | Combination particulate and acid-neutralizing filter | John H. Beard | 2006-11-07 |
| 6969461 | Combination particulate and acid-neutralizing filter | John H. Beard | 2005-11-29 |
| 6919023 | Acid neutralizing filter canister | Steven J. Merritt, Gene W. Brown, John H. Beard | 2005-07-19 |
| 6537453 | Acid-neutralizing filter | John H. Beard | 2003-03-25 |