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| Number | Title | Issue Date |
| 7300195 | Vibratory apparatus for settling the contents of a container A vibratory apparatus and method for settling the contents of a container. The vibratory apparatus includes a base and a load table located above the base. A plurality of resiliently flexible vertical support members attach the load table to the base. A pneumatic li... | 11/27/2007 |
| 7069925 | Pressure relief system for a gas fireplace A pressure relief system for a gas fireplace. The pressure relief system has a flue pipe with an opening in its side. A pressure relief plate is coupled to the flue pipe so that it is movable between an open and a closed state. The pressure relief plate positioned s... | 07/04/2006 |
| 7044851 | Air handling system for specialized facility An air handling system for a specialized environment, such as an operating room in a hospital or other health care facility is presented. The air handling system includes an air recirculation system having a blower for drawing air from the specialized environment fo... | 05/16/2006 |
| 6543698 | Fireplace make-up air heat exchange system The need to maintain the quality of air in a home has become more of a problem in new high efficiency tight houses so that governmental regulations are being proposed for a minimum change of fresh air. If too much cold outside fresh air is introduced into... | 04/08/2003 |
| 5971292 | Method of venting a furnace An improved furnace is provided which can be field modified to change the pressure drop across the inducer. The pressure drop is modified to accommodate vertical or horizontal venting and adequately lined and inadequately lined chimneys. A first rate of f... | 10/26/1999 |
| 5619935 | Portable incinerator heat recovery device and method of use A heat recovery device for use with a portable incinerator. The heat recovery device comprises first and second legs which support a heat exchanger thereon. An air flow path is formed from the bottom to the top of the first leg, through the heat exchanger... | 04/15/1997 |
| 5560350 | High efficiency, forced hot air heater which humidifies and cleans the air A compact, non-polluting, extremely energy-efficient, through-the-wall vented forced hot air heater, which humidifies and cleans said hot air without any additional equipment or water supply, comprises a rotating cylindrical heat and moisture transport/st... | 10/01/1996 |
| 5301873 | Low fluid indicator for pressurized canister A low fluid indicator for a fluid injection system of the type having a sealed pressurized canister, and a valve responsive to a control signal to release fluid from the canister includes a counter that maintains a count. A pulse generating circuit increm... | 04/12/1994 |
| 5297729 | Furnace apparatus An improved heating system is disclosed for providing heated air to a heated space, preferably using a gaseous fuel as the energy source. The system preferably includes an air heating sub-system, a compact combustion chamber, a separate cold air supply su... | 03/29/1994 |
| 5273210 | Room heating arrangement The room heating arrangement is provided with a radiation tube, connected to a pressure and mixing chamber casing 1, a pipe line system arranged above the room to be heated, the radiation tube being connected, on the one hand, to a return flow chamber 19 ... | 12/28/1993 |
| 5184600 | Regulating the humidity of a heated space by varying the amount of moisture transferred from the combustion gases The humidity of a heated space is regulated by varying the amount of moisture transferred from the combustion gases of the furnace used to heat the space. A porous heat sink element is arranged to move through the path of the combustion gases and one or m... | 02/09/1993 |
| 5094224 | Enhanced tubular heat exchanger The present invention is an enhanced tubular heat exchanger for a furnace. The tubes of the heat exchanger include an enhanced portion which has a smaller cross-sectional area than the flue portion, in the form of an elliptically shaped tube. The enhanced... | 03/10/1992 |
| 5092518 | Hot-air type heater Provided is a hot-air type heater including a heat generating means such as a burner heater from which hot air is produced and blown out the heater into a living room so as to warm up the inside of the room with a uniform temperature distribution even amo... | 03/03/1992 |
| 5062280 | Air conditioning apparatus Air conditioning apparatus with an enclosure which both houses a conditioning coil and serves as a plenum for transferring air to one or more conduits. In one aspect, vanes of the coil or coils are oriented to direct air toward openings in the plenum. An ... | 11/05/1991 |
| 4962749 | Method of operating a natural gas furnace with propane In a gas furnace designed for operation with natural gas, the use of propane as a fuel is facilitated by increasing the inducer speed by a factor which is obtained by comparing the higher inducer speed necessary to bring down the heat exchanger temperatur... | 10/16/1990 |
| 4836184 | Method for fuel economy There are disclosed means and method for improving the efficiency of combustion in an automatic gas-fired furnace through retardation, without restriction of the exhaust emission of the products of combustion, which are caused to dwell longer in the combu... | 06/06/1989 |
| 4784110 | Wall furnace The heat exchanger of a gravity flow wall furnace defines a tortuous, mostly vertical path for the combustion gases to improve heat transfer to the room. The gases are directed upwardly in a combustion chamber and then split into two portions and conducte... | 11/15/1988 |
| 4779795 | Convector room heater incorporating a hot water boiler According to the present invention there is provided a boiler comprising a firebox, a control device controlling the flow of air into the firebox, a water jacket surrounding at least part of the firebox, a sensor to sense the temperature of the water in o... | 10/25/1988 |
| 4753217 | Chambered gas fired convection heater The invention provides a compartmented gas fired heater in a cabinet-type outer stove casing. The outer stove casing has a downwardly positioned covered bottom with adjustable legs at four corners and an upwardly positioned opened top edge. A heat chamber... | 06/28/1988 |
| 4751910 | Flue gas/combustion air heat exchanger A flue gas/combustion air heat exchanger for a furnace. The furnace includes a combustion chamber that burns a mixture of fuel and combustion air to produce heat for a comfort zone. The resulting products of combustion, along with any waste heat not trans... | 06/21/1988 |
| 4739746 | Heat exchanger for furnace Heat transfer structure for transferring heat from products of combustion to air to be conditioned in a furnace. The heat transfer structure includes an inlet portion receiving hot products of combustion from a burner and extending generally transversely ... | 04/26/1988 |
| 4718401 | Hot air furnace A compact, high efficiency hot air furnace including a heat exchanger assembly located in a heat exchange chamber through which comfort air is passed to be heated. The heat exchanger assembly includes a drum-like combustion member located such that its ax... | 01/12/1988 |
| 4717402 | Air purification system An air purification system for use with an air conditioning apparatus which includes an air circulation system having supply air flow to a given area and return air flow for drawing air from that area. The air purification system includes an inlet and an ... | 01/05/1988 |
| 4669656 | Heating system An improved heating system is disclosed for providing heated air to a heated space, preferably using a gaseous fuel as the energy source. The system preferably includes an air heating sub-system, a compact combustion chamber, a separate cold air supply su... | 06/02/1987 |
| 4660761 | Flue gas heat pump A flue gas heat pump is provided for extracting heat from the discharged hot flue gas of a furnace. The heat pump includes a condenser at the inlet of the furnace cabinet in heat transfer relation with the flow of air to be conditioned, and an evaporator ... | 04/28/1987 |
| 4660543 | Apparatus for heating, storing and transferring of heat An apparatus having a heating chamber, (combustion chamber) a heat storing means and heat transferring means of the kind used in households, commercial furnaces, heaters, boilers, etc., having a heating chamber which is spherically arranged; with ports fo... | 04/28/1987 |
| 4653465 | Heater A heater for combustion of carbonaceous fuels comprising a casing which surrounds and contains the fuel immediately prior to and during combustion and a heat exchanger of unique design which is positioned within the casing. The efficiency of the heater ma... | 03/31/1987 |
| 4651923 | Heat extractor A heat extractor system for a furnace, said furnace including a burner with a chimney that is connected but is normally not in operation. Instead, the furnace is connected to a vent in parallel with the chimney through a draft-inducing arrangement includi... | 03/24/1987 |
| 4606399 | Heat recovery system with combustion gas accelerator A system is disclosed for recovering heat from high temperature combustion gases escaping from a heater such as for examples a domestic warm air furnace, boiler or the like. The system includes a first conduit leading to a chimney and a second conduit lea... | 08/19/1986 |
| 4557249 | Compact high efficiency furnace This invention relates to a compact high efficiency furnace having a cylindrical combustion chamber and a fin and tube type heat exchanger substantially parallel, transverse to the furnace air flow, and closely spaced in the air flow direction with no oth... | 12/10/1985 |
| 4557248 | Wood and gas fired furnace A furnace for wood log fuel having apparatus which automatically inserts the logs into the furnace combustion chamber. The log fuel is retained in a sloping ramp storage compartment. Electrical circuitry controlled by a thermostat operates to move a log i... | 12/10/1985 |
| 4541561 | Heating equipment and method of operating same The heating equipment includes an auxiliary heating apparatus having a space heater mounted within an air recirculating furnace system for heating air therein. A thermostat responds to a first predetermined ambient temperature to activate the space heater... | 09/17/1985 |
| 4537345 | Flame control system for heat exchanger Control circuits are provided for a heat exchange unit including environment responsive means placed in the general area of the heat exchange unit's heat exchanger or of the associated heat distribution network or return system. The environment responsive... | 08/27/1985 |
| 4518117 | Furnace structure Furnace structure including an outer enclosure divided into a cool air chamber and a hot air chamber separated by a combustion gas chamber through which heat exchange tubes pass air between the cool air chamber and the hot air chamber. The furnace structu... | 05/21/1985 |
| 4509681 | Control unit for make-up and combustion air circulation A control unit for make-up air and combustion air is disclosed for use with a furnace in an air circulating system for a building. A baffle having a combustion air inlet and a make-up air inlet is provided with a weather protective hood and adapted to be ... | 04/09/1985 |
| 4498624 | Control unit with separate dampers for make-up and combustion air circulation A control unit for make-up air and combustion air is disclosed for use with a furnace in an air circulating system for a building. A baffle having a combustion air inlet and a make-up air inlet is provided with a weather protective hood and adapted to be ... | 02/12/1985 |
| 4497439 | Heat extractor A heat extractor system for a furnace, said furnace including a burner with a chimney that is connected but is normally not in operation. Instead, the furnace is connected to a vent in parallel with the chimney through a draft-inducing arrangement includi... | 02/05/1985 |
| 4321758 | Heat cycling apparatus and method A heat cycling apparatus and method is provided for heating at least two chambers utilizing a pressurized heat source. The heated air is directed first to one chamber and then to the other on a predetermined repetitive time cycle.... | 03/30/1982 |
| 4261326 | High-efficiency recuperative furnace The invention relates to the conversion of a substantially conventional gas fired furnace utilizing two or more of the clam shell-type heat exchanger cells, which is modified by converting one cell to a final stage counterflow heat exchanger for the hot g... | 04/14/1981 |
| 4256082 | Warm air furnace A warm air furnace including a plenum, a blower, heat exchanger disposed within the plenum and an air distribution chamber. The heat exchanger includes an encasement surrounding a plurality of vertically extending heat exchanger tubes. The tubes are in co... | 03/17/1981 |
