Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887767 | Limit switch control method for a two-stage furnace | Gary W. Ballard | 1989-12-19 |
| 4860231 | Calibration technique for variable speed motors | Gary W. Ballard | 1989-08-22 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887767 | Limit switch control method for a two-stage furnace | Gary W. Ballard | 1989-12-19 |
| 4860231 | Calibration technique for variable speed motors | Gary W. Ballard | 1989-08-22 |