Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7412896 | Filter change indicator | Leon P. Janik, Michael J. Williams | 2008-08-19 |
| 7360433 | Filter change indicator | Leon P. Janik, Michael J. Williams | 2008-04-22 |
| 7137303 | Filter change indicator | Leon P. Janik, Michael J. Williams | 2006-11-21 |
| 6485643 | Modular base for a filter cartridge and method of manufacturing therefor | — | 2002-11-26 |