Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4790268 | Submersible chamber water heater | — | 1988-12-13 |
| 4742800 | Submersible chamber water heater | — | 1988-05-10 |
| 4721456 | Combustion element for a radiant energy burner and method of making same | Dirk N. Granberg | 1988-01-26 |
| 4685425 | Submersible chamber water heater | — | 1987-08-11 |
| 4627460 | Condensate discharge device for combustion apparatus | — | 1986-12-09 |
| 4301772 | Water heating apparatus | — | 1981-11-24 |