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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 |
| 7261241 | Heating and cooling energy saving device A system for regulating the temperature of multiple areas within a facility using multiple energy savings devices (ESD) that each regulate the temperature of individual rooms or areas within a facility having a central heating and cooling plant. The device includes ... | 08/28/2007 |
| 7255287 | Central heating An improved central heating reservoir (42) for use with central heating systems of the type having a boiler and a pump. The reservoir (42) is connected in line and has a liquid inlet (43) offset from an associated liquid outlet (44). Offs... | 08/14/2007 |
| 7066396 | Method and apparatus for enhanced heat recovery from steam generators and water heaters A heating system having a steam generator or water heater, at least one economizer, at least one condenser and at least one oxidant heater arranged in a manner so as to reduce the temperature and humidity of the exhaust gas (flue gas) stream and recover a major port... | 06/27/2006 |
| 6981651 | Heating system A heating system for a building comprises a boiler and radiators to which hot water is supplied from the boiler, in which at least some of the return water flow from the radiators, typically at 6° C., circulates through a first heat exchanger to cool the exhausting... | 01/03/2006 |
| 6929190 | Portable multi-purpose heating unit A multi-purpose heating unit is sized and configured to be used with a variety of attachments or devices to perform various functions such as heating, cooking and providing light. In particular, the multi-purpose heating unit includes a heat source which can be used... | 08/16/2005 |
| 6857578 | Combination water heating and space heating apparatus and control therefor A combination water heating and space heating apparatus includes a water heating unit and a space heating unit. The water heating unit has a water storage tank, a heating device for heating water stored in the tank, and a first temperature sensor for sensing water t... | 02/22/2005 |
| 6772712 | Energy system A low-pressure energy system is provided that includes a combustion chamber immersed in water within an insulated container. Low-pressure air flow is introduced into one end of the combustion chamber. Fuel, sparks and water are also introduced to the combustion cham... | 08/10/2004 |
| 6739517 | Non-circulating tank and kit for use with liquid heating unit A tank for use with a liquid heating vessel of a hydronic radiant heating system to assist in the simultaneous sealing and venting of air from the system where the heating vessel has a flue for release of exhaust, the tank including a liquid holder that is exposed t... | 05/25/2004 |
| 6622929 | Steam heating system The present invention increases the efficiency of a heat distribution system, and more specifically steam heating systems designed to maintain a constant temperature in a relatively large space by distributing the steam through pipes assembled with timers... | 09/23/2003 |
| 5979782 | Fireplace heat transfer system with internally driven fluid flow mechanism A heat transfer system for use with a conventional fireplace for radiating heat at a remote location from the fireplace. The heat transfer system includes a network of interconnecting conduit sections charged with an internal fluid medium and consists of ... | 11/09/1999 |
| 5721804 | Y-shaped portable electric space heater with value to reduce pressure within the boiler A space heater employs a generally Y-shaped housing. A boiler within the housing contains a working fluid at subatmospheric pressure when at ambient temperature. This reduces the boiling point of working fluid. A series of heat exchangers are mounted in t... | 02/24/1998 |
| 5533669 | Heat transfer apparatus A heat transfer apparatus is provided with a refrigerant heater, a single container disposed above the refrigerant heater, and the radiator spaced from the container. The container accommodates a partitioning plate for separating the inside of the contain... | 07/09/1996 |
| 5341455 | Oil radiator with welded plate radiating elements having folded portions providing cool planar lateral outer surfaces for preventing injuries An oil radiator, particularly for heating rooms, includes a main body defined by a plurality of mutually associated radiating elements in which a diathermic oil heated by an electric resistor circulates. Each radiating element includes a pair of mating sh... | 08/23/1994 |
| 5299278 | Forced air circulation electric convection space heating system utilizing heated air discharge to preheat air to be heated An electric forced circulation space heating system has a first heat exchanger provided with electric heating elements for heating a heat exchange fluid, such as antifreeze or oil, pumped through a closed loop including first flow passages of a second hea... | 03/29/1994 |
| 5024379 | Variable capacity heating appliance A heating system with a hot water coil is provided with a variable speed blower whose speed is regulated in response to a sensed load in the system. Heat can therefore be added to the hot water by way of a simple burner system, with the required control b... | 06/18/1991 |
| 4904846 | Oil filled body heater An electric heating device warms by radiation and convection. A metal casing holds a quantity of heat-conducting oil, with a remaining relatively small volume of space in the container evacuated of air and occupied by an inert gas under subatmospheric pre... | 02/27/1990 |
| 4873421 | Liquid-filled electric radiator A liquid-filled electric radiator has a rectangular, vertically disposed radiator body with an upper horizontal distribution duct connected to a lower horizontal collection duct by a plurality of vertical connecting ducts within the radiator body. An angu... | 10/10/1989 |
| 4870253 | Mobile apparatus for heating rooms The mobile apparatus for heating rooms has a radiator comprising a set of radiating elements inside which there flows a superior diathermal fluid, rigidly associated with a supporting body having at least one thermoventilation unit for the delivery of war... | 09/26/1989 |
| 4718601 | Heating unit An improved heating unit includes a water storage tank having an immersion heating element, with the water being pumped from the storage tank through the coils of a heat exchanger or condenser element. Ambient air is drawn over the coils and through a ven... | 01/12/1988 |
| 4705213 | Heat unit recycler A heat unit recycler for the exchange of air in a room includes an enclosed tank containing a liquid to be heated. A heating mechanism is provided for heating the liquid in the tank and a temperature control is provided for controlling the heating device ... | 11/10/1987 |
| 4638943 | Method of heating any building or room and apparatus for carrying out the said method The present invention relates to a method and an apparatus for heating a building, room or any like space characterized in that it combines into a unit a hot-water generator constituted by a fan associated with a water-air exchanger with high thermal iner... | 01/27/1987 |
| 4584985 | Hot water heating installation The hot water heating installation comprises a hearth or combustion space for solid fuels and a heat exchanger arranged above the hearth. The heat exchanger is structured as a closed water jacket. A burner for liquid or gaseous fuels is arranged adjacent ... | 04/29/1986 |
| 4567351 | Electric space heater employing a vaporizable heat exchange fluid An electric space heater includes a housing having inlet and outlet openings and enclosing a heat exchange structure having a main tube and a secondary tube communicated by conduit pipes to define a closed space, exhausted of air, in which a working fluid... | 01/28/1986 |
| 4518847 | Electrically-powered portable space heater A portable electrically-powered space heater includes an electrically-powered boiler generating steam at subatmospheric pressure from a mixture of water and ethylene glycol that is circulated through a closed loop heat exchanger, portions of which compris... | 05/21/1985 |
| 4496099 | Low pressure heating system A low pressure system for extracting heat from the fire combustion zone within a fireplace, wood or coal burning stove, or the like, and for automatically distributing it within a region adjacent to the fire. Preferably the apparatus includes a first heat... | 01/29/1985 |
| 4424934 | Hot water heating system A hot water heating system wherein an air-to-water heat exchanger is attached to the outside of a jacketed space heater, and a fan draws hot air through an opening in the jacket and downward through the heat exchanger.... | 01/10/1984 |
| 4414464 | Electrical water heating device with improved internal circulation An electrical water heating device for use in a closed circuit heating system, such as a central heating system, includes a horizontally elongated hollow cylindrical body having a top, bottom and a pair of opposite ends. At least two electric heating elem... | 11/08/1983 |
| 4412652 | Economizer for building heating systems An economizer is provided for building heating systems and the like, of the type having a forced air furnace with adjacent combustion and heat exchange chambers, and a hot water reservoir or heater. The economizer comprises lower and upper heat transfer c... | 11/01/1983 |
| 4223205 | Central heating systems furnace having a self-contained electric steam heating unit A central heating system furnace includes a self-contained closed-system steam heating unit mounted in a housing having a cold air inlet and a hot air outlet. The unit includes a plurality of side-by-side radiators arranged above a boiler unit having an e... | 09/16/1980 |
| 4158386 | Self-pumping water boiler system A package heat exchange system using an expanded surface gas-fired burner to supply heat via a heat exchange coil in a dome above the extended surface heat exchanger which heats domestic hot water and supplies heat via the dome to a radiator for heating a... | 06/19/1979 |
| 4125151 | Package heat exchanger system for heating and cooling A compact heating and cooling system in which air ducts are connected to a heat exchanger system through which a coolant fluid from a condensing unit or a heating fluid from a compact water heater is selectively directed by a control circuit so that the s... | 11/14/1978 |
| 4105894 | Steam heated hot air furnace having an electric steam boiler In a furnace having a boiler in which a pair of spaced electrode plates are supported, electric current is applied to the electrodes to generate steam which flows out of the boiler through a steam conduit to a heat exchanger. A blower forces air across th... | 08/08/1978 |
| 4095087 | Miniature system for central heating and water heating A miniature heater system has electric immersion heaters in a heating enclosure which forms a compact monoblock composite unit resistant to high pressures. In this unit several horizontal tubes are connected at or near their ends by two vertical distribut... | 06/13/1978 |
| 3941311 | Heating unit Disclosed is a heating unit consisting of a boiler chamber in which a two-phase liquid system is placed under a slight vacuum and supplied with a source of thermal energy. The activation of the source of thermal energy causes the lower phase liquid to vap... | 03/02/1976 |
