Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872828 | Integrated furnace control and control self test | Eugene P. Mierzwinski, Michael T. Grunden | 1989-10-10 |
| 4865538 | Fail safe gas valve drive circuit | Victor F. Scheele | 1989-09-12 |
| 4842510 | Integrated furnace control having ignition and pressure switch diagnostics | Michael T. Grunden, Eugene P. Mierzwinski | 1989-06-27 |
| 4832594 | Control system with timer redundancy | — | 1989-05-23 |
| 4828484 | Gas valve relay redundant safety | — | 1989-05-09 |