Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9291355 | System and method for controlling a furnace | — | 2016-03-22 |
| 9261277 | Inducer speed control method for combustion furnace | Stephen Kowalski, Robert G. Roycroft | 2016-02-16 |
| 9228758 | Modulating gas furnace | — | 2016-01-05 |
| 8672670 | System and method for controlling a furnace | — | 2014-03-18 |
| 8261733 | Modulating gas furnace | — | 2012-09-11 |
| 8117862 | Device and method for recording air conditioning system information | Robert W. Helt, Jie Song, John T. Taylor, W. Randall Erwin, Stephen Kowalski +4 more | 2012-02-21 |
| 8091373 | Method of twinning air conditioning units | Roger L. Boydstun | 2012-01-10 |
| 7975494 | Control system interface with display for air conditioning apparatus | Roger L. Boydstun, Robert W. Helt, Carl L. Garrett, Daniel John Blair, Robert G. Royoroft +1 more | 2011-07-12 |
| 7837128 | Multiple thermostats for air conditioning system with time setting feature | Robert W. Helt, Carl L. Garrett | 2010-11-23 |
| 7664575 | Contingency mode operating method for air conditioning system | Roger L. Boydstun | 2010-02-16 |
| 7640761 | System and method for controlling indoor air flow for heating, ventilating and air conditioning equipment | Carl L. Garrett, Timothy Wayne Storm, Robert W. Helt | 2010-01-05 |
| 7600694 | Multiple thermostats for air conditioning system with time setting feature | Robert W. Helt, Carl L. Garrett | 2009-10-13 |
| 7455238 | Control system and method for multistage air conditioning system | — | 2008-11-25 |
| 6925999 | Multistage warm air furnace with single stage thermostat and return air sensor and method of operating same | Leonard W. Holmes | 2005-08-09 |
| 6066194 | Electronic room air cleaner with variable speed motor | Robert W. Helt | 2000-05-23 |