Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5370529 | Low NO.sub.x combustion system for fuel-fired heating appliances | Larry R. Mullens, Keith M. Grahl | 1994-12-06 |
| 5322050 | High efficiency fuel-fired condensing furnace having a compact heat exchanger system | — | 1994-06-21 |