Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887767 | Limit switch control method for a two-stage furnace | Kevin D. Thompson | 1989-12-19 |
| 4860231 | Calibration technique for variable speed motors | Kevin D. Thompson | 1989-08-22 |
| 4850852 | Gas valve shut off method and apparatus | — | 1989-07-25 |
| 4815524 | Control system for a furnace operating in the continuous blower mode | Daniel J. Dempsey | 1989-03-28 |