Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7293718 | Variable output heating and cooling control | Paul E. Sigafus, Ralph H. Torborg, Larry Lutton | 2007-11-13 |
| 6866202 | Variable output heating and cooling control | Paul E. Sigafus, Ralph H. Torborg, Larry Lutton | 2005-03-15 |
| 6864659 | Variable speed controller for air moving applications using an AC induction motor | Paul E. Sigafus, Larry Lutton, Nickolas G. Vrionis | 2005-03-08 |
| 5352930 | System powered power supply using dual transformer HVAC systems | — | 1994-10-04 |
| 5230482 | Electronic time thermostat with a temporary next period adjustment means | Robert J. Schnell, Daniel T. Uhrich | 1993-07-27 |
| 5226591 | Active low temperature limit for battery powered thermostat | — | 1993-07-13 |
| 5203497 | Communicating thermostat | Robert J. Schnell | 1993-04-20 |
| 5197668 | Communicating thermostat | Robert J. Schnell, Daniel T. Uhrich | 1993-03-30 |
| 4789329 | Thermostatically operated fuel valve control circuit | John E. Bohan, Jr., John L. Erdman, Marvin D. Nelson | 1988-12-06 |
| 4250441 | Servo apparatus with electrical motion limiting | James F. Chapman | 1981-02-10 |