Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5197456 | Gas water heater with improved exhaust distribution in multiple flues | — | 1993-03-30 |
| 4978293 | Nozzle mix, open power burner | — | 1990-12-18 |
| 4898124 | Scale agitator | Dirk N. Granberg, Frank H. Suchomel | 1990-02-06 |