Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873838 | Refrigerant metering in a variable flow system | Roger J. Voorhis | 1989-10-17 |
| 4835715 | Outdoor ambient temperature determination | Ronald W. Bench, Robert W. Peitz, Daryl G. Erbs | 1989-05-30 |
| 4796436 | Heat pump charging | Roger J. Voorhis, Derrick A. Marris, James D'Agostino | 1989-01-10 |