Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7950988 | Variable volume floor diffuser with attachment means | Stan Demster, Andrew Helgeson, Michael J. McQueeny, Jr., Jeffery Otte | 2011-05-31 |
| 5976010 | Energy efficient air quality maintenance system and method | John P. Kettler | 1999-11-02 |
| 5707005 | Control system for air quality and temperature conditioning unit with high capacity filter bypass | John P. Kettler | 1998-01-13 |
| 5590830 | Control system for air quality and temperature conditioning unit with high capacity filter bypass | John P. Kettler | 1997-01-07 |
| 5564626 | Control system for air quality and temperature conditioning unit with high capacity filter bypass | John P. Kettler | 1996-10-15 |
| 4500034 | Electronic control arrangement for system powered HVAC terminal units | Raymond H. Dean | 1985-02-19 |