Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7293718 | Variable output heating and cooling control | Paul E. Sigafus, James W. Ratz, Larry Lutton | 2007-11-13 |
| 6866202 | Variable output heating and cooling control | Paul E. Sigafus, James W. Ratz, Larry Lutton | 2005-03-15 |
| 5555704 | Sterilization system | James E. Caufield, Wilmer L. Adams | 1996-09-17 |
| 5307990 | Adaptive forced warm air furnace using analog temperature and pressure sensors | Wilmer L. Adams | 1994-05-03 |
| 5248083 | Adaptive furnace control using analog temperature sensing | Wilmer L. Adams | 1993-09-28 |
| 4588372 | Flame ionization control of a partially premixed gas burner with regulated secondary air | — | 1986-05-13 |
| 4547144 | Fuel gas control | Paul Dietiker, Elwyn H. Olson | 1985-10-15 |
| 4439139 | Furnace stack damper control apparatus | Lorne W. Nelson | 1984-03-27 |
| 4373897 | Open draft hood furnace control using induced draft blower and exhaust stack flow rate sensing | — | 1983-02-15 |
| 4340355 | Furnace control using induced draft blower, exhaust gas flow rate sensing and density compensation | Lorne W. Nelson | 1982-07-20 |
| 4251025 | Furnace control using induced draft blower and exhaust stack flow rate sensing | Ulrich Bonne, Lorne W. Nelson | 1981-02-17 |