Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4622947 | Recuperative furnace | Warren W. Kuipers | 1986-11-18 |
| 4449511 | Recuperative furnace | Warren W. Kuipers | 1984-05-22 |
| 4274581 | Package heat exchanger system for heating and cooling | Ralph W. Sweitzer | 1981-06-23 |
| 4243176 | Sealing and air/fuel mixture flow metering plate for gas furnaces | — | 1981-01-06 |