Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6888423 | Electronic filter assembly | Andrew F. Tresness, Martin L. Zelenz | 2005-05-03 |
| 6674343 | Electronic filter assembly | Andrew F. Tresness | 2004-01-06 |
| 6323743 | Electronic filter assembly | Martin L. Zelenz, Andrew F. Tresness | 2001-11-27 |
| 5440282 | Filter structure with anti-rotation keying | Alan E. Devendorf | 1995-08-08 |