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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 5855320 | Combined furnace and heat recovery system The present invention relates to a combined furnace and air recovery system. The system is comprised of a furnace housing having an inlet opening for connection to a cold air return duct and an outlet opening connected to a heating duct. A negative pressu... | 01/05/1999 |
| 5191874 | Heavy gas, including radon gas, expeller assembly A heavy gas expeller assembly to be connected to a furnace assembly to collect, direct, and expel harmful heavy gases and fluids, including radon gas, from adjacent a support floor. The heavy gas expeller assembly includes 1) a gas collector duct member c... | 03/09/1993 |
| 4967726 | Space heating and ventilation systems for buildings A heating and ventilation unit has a ceramic heat wheel rotatable within a housing between first and second plenums through which fresh and stale air, respectively, are forced to pass in a hot air ventilation system. The heat wheel is made of cordierite m... | 11/06/1990 |
| 4834285 | Heating and ventilating system A heating and ventilating system has a space heating device, in which heat is generated by combustion of a fuel, and which heats air for a building. A heat exchanger has one side through which exhaust air from the building flows to the exterior. Through t... | 05/30/1989 |
| 4182401 | Supplemental heating and cooling system In a building an automatically controlled supplemental duct system causes circulation of warm air from the attic space during the heating season and cool air from the basement space during the cooling season when favorable temperature differences exist be... | 01/08/1980 |
| 4175538 | Energy saving furnace construction A furnace shell has a fire pot centrally located therein, the walls of the shell and fire pot being spaced to form a fluid heat transfer chamber therebetween. Heat transfer is effected between the pot and the chamber to heat the fluid medium in the chambe... | 11/27/1979 |
| 4168797 | Heated air distribution system A heated air distribution system for a forced air heating system of a home or the like for distributing heated air preferably from a higher heated area to a lower heated area. The heated air distribution system utilizes the air return ducts of the forced ... | 09/25/1979 |
