Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813383 | Water heater tank flushing device | — | 1989-03-21 |
| 4676199 | High efficiency water heater construction | Wilbur L. Haag, Jr. | 1987-06-30 |
| 4555837 | Method of making an improved water heater tank assembly | Keith R. Clark | 1985-12-03 |
| 4488342 | Vessel construction employing multiple internal heat exchange tubes | — | 1984-12-18 |
| 4452226 | Water heater tank assembly | Keith R. Clark | 1984-06-05 |
| 4415020 | Vessel construction employing multiple internal heat exchange tubes | — | 1983-11-15 |