Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880157 | Capacity control for integrated furnace | Jay L. Boot, Ian M. Shapiro | 1989-11-14 |
| 4807588 | Water permeable heat exchanger for condensing furnace | Richard M. Bentley, Henry F. Keller | 1989-02-28 |