Issued Patents All Time
Showing 26–45 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6390806 | Pneumatic system for flame rollout and draft safeguard protection | Ninev Karl Zia, Timothy J. Waterman | 2002-05-21 |
| 6321744 | Modulating furnace having a low stage with an improved fuel utilization efficiency | Kevin D. Thompson | 2001-11-27 |
| 6283115 | Modulating furnace having improved low stage characteristics | Kevin D. Thompson | 2001-09-04 |
| 6161535 | Method and apparatus for preventing cold spot corrosion in induced-draft gas-fired furnaces | Kevin D. Thompson | 2000-12-19 |
| 6155341 | Continuous fan adjustment method | Kevin D. Thompson, William F. Van Ostrand | 2000-12-05 |
| 6021775 | Mobile home furnace | Timothy J. Waterman, Merle D. Sears, Scott A. Beck, Larry D. Rieke | 2000-02-08 |
| 5878741 | Differential pressure modulated gas valve for single stage combustion control | William J. Roy | 1999-03-09 |
| 5522541 | Method for proving furnace high-heat pressure switch | Ninev Karl Zia, Hall Virgil, Jr. | 1996-06-04 |
| 5379752 | Low speed interlock for a two stage two speed furnace | Hall Virgil, Jr., Ninev Karl Zia | 1995-01-10 |
| 5326025 | Warm up method for two stage furnace | Kevin D. Thompson | 1994-07-05 |
| 5024379 | Variable capacity heating appliance | — | 1991-06-18 |
| 4962749 | Method of operating a natural gas furnace with propane | Kevin D. Thompson | 1990-10-16 |
| 4896411 | Method of making a multiple cell condensing heat exchanger | — | 1990-01-30 |
| 4891004 | Control of energy use in a furnace | Gary W. Ballard | 1990-01-02 |
| 4815524 | Control system for a furnace operating in the continuous blower mode | Gary W. Ballard | 1989-03-28 |
| 4789330 | Gas furnace control system | Gary W. Ballard | 1988-12-06 |
| 4729207 | Excess air control with dual pressure switches | Robert W. Peitz, Kevin D. Thompson | 1988-03-08 |
| 4703747 | Excess air control | Kevin D. Thompson, Robert W. Peitz | 1987-11-03 |
| 4603680 | Furnace inducer outlet box assembly | Kent L. Parker | 1986-08-05 |
| 4401425 | Safety switch for a combustion system | Gerald K. Gable | 1983-08-30 |