Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838483 | Vav valve control with transducer tolerance compensation | Mark E. Nurczyk | 1989-06-13 |
| 4830274 | Pressure independent VAV valve with pressure dependent backup | Ronald J. Lievens | 1989-05-16 |