Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11819792 | Bidirectional airflow filter | — | 2023-11-21 |
| 9943796 | Multi layer pleatable filter medium | Thaddeus J. Ptak, Russell L. Baldinger | 2018-04-17 |
| 9320998 | Collapsible pleated filter and frame | — | 2016-04-26 |
| 8641794 | Air filter and air filter system | — | 2014-02-04 |
| 8105425 | Air filter formed by slit and expanded layers of electrostatically enhanced material | Thaddeus J. Ptak, Russell L. Baldinger | 2012-01-31 |
| 7951229 | Air filter formed from slit and expanded layers of electrostatically enhanced material | Thaddeus J. Ptak, Russell L. Baldinger | 2011-05-31 |