Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872828 | Integrated furnace control and control self test | Michael T. Grunden, Stephen E. Youtz | 1989-10-10 |
| 4842510 | Integrated furnace control having ignition and pressure switch diagnostics | Michael T. Grunden, Stephen E. Youtz | 1989-06-27 |
| 4839558 | Integrated DC electroluminescent display system | — | 1989-06-13 |