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| Number | Title | Issue Date |
| 7665427 | Heat exchange system with steam trap protection An improved shell-and-tube steam instantaneous heat exchange system of a closely coupled feedback design which overheats water in the heat exchanger portion of the system and then blends the water, as needed, with proportional amounts of cold water to achieve the co... | 02/23/2010 |
| 7299769 | Condensing gas fired water heater A water heater is shown having a closed metal tank with an upwardly mounted combustion chamber and burner/blower assembly. Curved fire tubes convey the products of combustion from the chamber to an exterior mounted flue assembly. The closed tank is enclosed by a rot... | 11/27/2007 |
| 7278379 | Heat exchange system An improved shell-and-tube steam instantaneous heat exchange system of a closely coupled feedback design which overheats water in the heat exchanger portion of the system and then blends the water, as needed, with proportional amounts of cold water to achieve the co... | 10/09/2007 |
| D533263 | Portable water heater | 12/05/2006 |
