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| Number | Title | Issue Date |
| 7203416 | Ventilating and heating apparatus with heater shielded by tapered discharge duct The invention provides a ventilating and heating apparatus for installation in a building structure. In some embodiments, the apparatus includes a main housing in which is located a ventilating fan assembly and a heater fan assembly having a heater and a discharge d... | 04/10/2007 |
| 7200327 | Electric heating device, in particular for a vehicle heating and/or air-conditioning apparatus Electric heating device comprising an electric radiator (10) for heating the air passing through it, said radiator comprising a casing (12), at least one resistive element mounted in the casing and constituted by at least one zigzag metal strip (22 | 04/03/2007 |
| 7154072 | Method of using open coil resistance heater in appliances with right and left hand installation capability An open coil resistance heater assembly is made for universal mounting between left and right hand installations in an appliance or other equipment. The heater assembly has its coils arranged symmetrically about a bisecting plane of the heater assembly and/or a cent... | 12/26/2006 |
| 7149416 | Clothes dryer heater with air flow increasing device adjacent the heating element A heater for a washer-dryer includes a duct in which heating elements for heating the air flowing through the duct are disposed. A device for increasing the airflow in the area of a heating element is provided in the duct to improve the transportation of heat away f... | 12/12/2006 |
| 6169850 | Air heating device This air heating device especially suited for low pressure air comprises an air duct in which an electric heating coil is located together with a thermistor which is part of an electronic thermostat to control the electric heating coil. The thermistor bea... | 01/02/2001 |
| 6141495 | Portable flue heater to reduce or eliminate downdrafts A flue heater is detachably secured to the flue of a chimney. The flue heater uses an electrical power source to create heat and direct the heated air into the lower portion of a flue. The device can be attached to the flue before igniting a fire and remo... | 10/31/2000 |
| 5607014 | Multi-staging of supplemental heat in climate control apparatus An improved heat pump system of the type having a thermostat capable of generating at least three stages of demand signals, outdoor and indoor heat exchange coils, at least one fan, a compressor, an expansion device, with the flow of refrigerant being rev... | 03/04/1997 |
| 5329098 | Open coil heater for efficient transport An electric heater includes an electric heating coil that extends above the sidewalls of an air flow channel. The coil is formed in sections that extend transversely to the channel and are spaced by the width of a coil section to allow two heaters to be a... | 07/12/1994 |
| 4857707 | Flexible frame heater element for dryer A longitudinally flexible electrical heating element for a dryer is provided which permits the heating element to be inserted into and removed from a vertical air inlet conduit located behind the dryer drum from the front of the dryer. A front panel of th... | 08/15/1989 |
| 4837547 | Thermal cutoff assembly A thermal cutoff is mounted adjacent a bleed opening in a hot air duct. Hot air flowing through the bleed opening mixes with ambient air before contacting the thermal cutoff. If a predetermined air temperature is exceeded, the thermal cutoff operates, and... | 06/06/1989 |
| 4814579 | Electric resistance air reating system for an aircraft cabin An aircraft cabin air heater system for a multiengine aircraft having a cabin and a nose duct communicating therewith includes an electric resistance air heater unit positioned in the cabin and provided with air ducts leading from the cabin to the air hea... | 03/21/1989 |
| 4710610 | Electric resistance heater and limit switch assembly A heater and limit switch assembly, particularly useful for installation in the conditioned air duct of a rooftop air conditioner. The loop of a rigid-loop heater, mounted on a vertical plate by two parallel legs, is modified to provide an inward offset p... | 12/01/1987 |
| 4628190 | Duct heater A duct heater includes end brackets connected by frame bars. The end brackets are formed into a geometric shape whereby only corners of the bracket engage an inner surface of the duct. Assembly is facilitated by providing the end brackets as thin, flat st... | 12/09/1986 |
| 4617547 | Heater assembly A heater assembly includes a housing which both channels air flowing around a heating element and provides support structure for the elements holding the heating element. In one embodiment, a lower U-shaped channel has recesses in opposed sidewalls to eng... | 10/14/1986 |
| 4603247 | Electrical duct heater assembly This duct heater assembly includes a duct section having upper and lower wall portions and opposed side portions. The upper and lower portions include end margin portions connectible to the end margins of conventional duct line section by "S" strip connec... | 07/29/1986 |
| 4593176 | Unit for converting a fossil fuel burning furnace into an electrical furnace A unit for converting a fossil fuel burning furnace into an electrical furnace for utilization of electrical energy for heating, except under those periods of high energy usage during which the cost of electrical power is high, or during periods when extr... | 06/03/1986 |
| 4523081 | Forced air baseboard heater and air duct diffuser An electric heater adapted to be used as a space heater or to be mounted over the discharge end of a hot air duct to diffuse air flowing into a room from the hot air duct and to heat the air in the room. The electric heater includes a housing adapted to b... | 06/11/1985 |
| 4459466 | Dual air passage heating apparatus with ceramic heater element An air heating apparatus comprises a auxillary PTC heating element in an air duct lying parallel to the length of the duct to define first and second air passages separated by the heating element. The PTC heating element has apertures through which passes... | 07/10/1984 |
| 4417131 | Alternative heating apparatus for use in a heating system having a fuel burner, particularly a forced-air central heating system The invention consists of an electrical heating apparatus which provides for controlled fuel substitution in a heating system, particularly a forced-air central heating system. The electrical heater assembly is mounted in the system and a device is provid... | 11/22/1983 |
| 4369765 | Supplemental heating system using solar radiation A heating system for supplementing a conventional furnace or the like is disclosed. The system includes a blower that receives air from the hot air supply system of the conventional furnace, and directs the air through a separate duct to the space to be h... | 01/25/1983 |
| 4310747 | Method and apparatus utilizing a porous vitreous carbon body particularly for fluid heating A body of a specially prepared, porous vitreous carbon which does not crack or substantially change in electrical resistance with time when heated to elevated temperatures in air and which is used in a method or apparatus to heat a fluid stream flowing in... | 01/12/1982 |
| 4272668 | Small round air stream heating unit An electric air stream heater adapted to operate directly on 120 volts with a wattage output of less than 500 watts without the need for any special control module, comprising, a cylindrical heating assembly having at least two spaced apart, parallel elec... | 06/09/1981 |
| 4253444 | Electric furnace fireplace An electric furnace fireplace including a heat exchanging fireplace for burning any type of combustible fuel, and electric heating elements positioned near the fireplace plenum exhaust for operation as an electric furnace. An oven is provided above the fi... | 03/03/1981 |
| 4234782 | Space heating using off-peak electric heat storage An off-peak, electric, central air heating system for buildings incorporating a heat storage material that is used to store heat generated electrically during off-peak electrical power periods and to deliver heat on demand. The heat storage material is an... | 11/18/1980 |
| 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 |
| 4200783 | Apparatus for collecting and thermally storing energy An apparatus for collecting and storing energy includes a thermal energy storage cell having a single-piece steel inner core provided with external thermal insulation. A unit for collecting and converting non-electrical energy into electrical energy, such... | 04/29/1980 |
| 4171772 | 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... | 10/23/1979 |
| 4151398 | Clothes dryer heating unit A forced convection electrical heater assembly advantgeously utilizing expanded resistance alloy foil or grid in a pattern which produces a uniform temperature distribution in the existing airstream and which produces relatively little flow restriction on... | 04/24/1979 |
| 4144445 | Open coil electric heaters An open coil electric heater wherein the resistance conductor is supported on a frame. The resistance conductor in this instance, instead of being in the form of a single coiled wire, is composed of a plurality of strands of wire so as to reduce the cost ... | 03/13/1979 |
| 4076011 | Warm air heating and fire-place system A warm air heating system which efficiently and inexpensively combines a fire-place to another warm air heating device or unit to form a balanced warm air heating system and thus efficiently use the heat output of the fire-place. This warm air heating sys... | 02/28/1978 |
| 4065055 | Complete system for a home air heating and cooling, hot and cold water, and electric power A complete system for installation within a house, and which heats the house in winter, cools it in summer, provides a hot and cold water supply throughout the year and all its electrical appliances; the system in one design includes a gasoline engine con... | 12/27/1977 |
| 4061267 | Solar heating system and operation thereof A solar heating system, using a pebble bed as a heat storage, includes an auxiliary heater, providing heat for the system and/or for the pebble bed during times of low solar heat accumulation and during off-peak use loading of the public utility network s... | 12/06/1977 |
| 3994276 | Method of solar heating so as to reduce oil and gas consumption Solar heating, especially the use of solar heating to reduce oil and gas consumption in conventional forced air heating systems of the type having supply and return ducts. During daylight hours, solar heated air is circulated as a heating supplement or su... | 11/30/1976 |
