Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5271376 | Serpentined tubular heat exchanger apparatus for a fuel-fired forced air heating furnace | Lin Lu, Diane M. Jakobs, Gallen W. Stokes | 1993-12-21 |
| 5178124 | Plastic secondary heat exchanger apparatus for a high efficiency condensing furnace | Lin Lu, Diane M. Jakobs, Gallen W. Stokes | 1993-01-12 |