Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7833299 | Filters and filter assemblies with bypass seal | Bruce W. Dawson, Thaddeus J. Ptak | 2010-11-16 |
| 7513933 | Electrically enhanced air filtration with improved efficacy | Sven Coppom, Brian Coppom | 2009-04-07 |
| 7025806 | Electrically enhanced air filtration with improved efficacy | Sven Coppom, Brian Coppom | 2006-04-11 |
| 5593476 | Method and apparatus for use in electronically enhanced air filtration | — | 1997-01-14 |
| 5549735 | Electrostatic fibrous filter | — | 1996-08-27 |
| 5043840 | Apparatus and method for selective environmental conditioning of substantially enclosed areas | James E. Yehl | 1991-08-27 |
| 5010777 | Apparatus and method for establishing selected environmental characteristics | James E. Yehl | 1991-04-30 |
| 4911737 | Apparatus and method for environmental modification | James E. Yehl | 1990-03-27 |