Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7575001 | Solar and heat pump powered electric forced hot air hydronic furnace A furnace and method using a heat pump for providing domestic hot water and forced hot or cooled air utilizing heat pump achieved efficiency levels in an on-demand and unlimited domestic hot water, heating, and cooling system. In the heating mode, recycled air acqui... | 08/18/2009 |
| 7398778 | Solar and heat pump powered electric forced hot air hydronic furnace A furnace in combination with a heat pump and solar panels for providing domestic hot water and forced hot or cooled air utilizing heat pump achieved efficiency levels in an on-demand and unlimited domestic hot water, heating and air conditioning system. In heating ... | 07/15/2008 |
| 7360507 | Energy saving apparatus An energy saving apparatus is described. The energy saving apparatus is attached to a standard gas-powered water heater. All gas-powered water heaters typically have an air vent which vents hot air from the water heater. The apparatus takes advantage of this fact by... | 04/22/2008 |
| 7360580 | External flue heat exchangers A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger ... | 04/22/2008 |
| 7270098 | Vehicle heater and controls therefor A heater for a liquid has a combustion chamber, a jacket for the liquid extending about the combustion chamber and a burner head assembly connected to the combustion chamber. The burner head assembly includes a housing having a burner mounted thereon and a hollow in... | 09/18/2007 |
| 7225995 | Space heating and cooling An air handler operates alternately in (a) a heating state at times when air in a space in a building is at an actual temperature that is insufficient relative to a set temperature and (b) a non-heating state at times when the air in the space is at an actual temper... | 06/05/2007 |
| 7216696 | External flue heat exchangers A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger ... | 05/15/2007 |
| 7190887 | Portable thermal-stratifying space heater and powerplant package A portable room heater is provided comprising an upright enclosure defining an inlet at a lower end of the enclosure, an outlet at an upper end of the enclosure, and a passageway fluidly connecting the inlet and the outlet. The portable room heater further comprises... | 03/13/2007 |
| 7100541 | High efficiency tank type continuous flow and self cleaning water heater A water heater comprising a closed tank having a water inlet for connection with a water supply, and a hot water outlet connected to the tank interior; a flue pipe extending vertically through the tank and having an upper portion for connection with a vent pipe; a c... | 09/05/2006 |
| 7011300 | Steam humidifier and method The steam humidifier fed with a premix of natural gas and forced air under low pressure (less than 1 psi) includes a main frame, a movable lower frame, a two part evaporation canister, releasably sealed, for water, an immersible combustion chamber retaining a radian... | 03/14/2006 |
| 7007742 | Method and system for pre-heating water A system and method for pre-heating water prior to entering a hot water heater is disclosed. The system includes: a cold water supply line; an ambient air heat exchange device positioned within an insulated area of a building wherein the ambient air heat exchange de... | 03/07/2006 |
| 7007857 | Compact vehicle heating apparatus and method A compact vehicle heating system and method is provided which includes mechanisms to selectively shut down heating systems. For example, when domestic hot water is required, space heating and engine preheating systems can be shut down in order to provide priority he... | 03/07/2006 |
| 6938582 | Heat exchanging type boiler The present invention relates to a heat exchanging type boiler that includes: a water retaining reservoir 10 in which a predetermined amount of water is charged; and a combustion chamber 33 for emitting heating gas at a high temperature to the water in... | 09/06/2005 |
| 6880547 | Wood burning swimming pool heater A swimming pool heater that heats a private swimming pool and can be used to provide heating for a house, a cottage or a commercial swimming pool. Wood, that is often found around pools, is used as primary fuel. This oven has a cylindrical external appearance and is... | 04/19/2005 |
| 6763786 | Equipment for water heater The invention relates to an equipment to be used in a gas-fired water heater which equipment contains a combustion chamber (2) and a heat exchanger (1). Accordingly the combustion chamber (2) is made of a ceramic material and provided with slots... | 07/20/2004 |
| 6293275 | High-temperature gas heater A compact heat source is provided which includes a bell-shaped or conical recuperator that surrounds a combustion chamber. The recuperator consists of parts that are axially tensioned against one another, so that a stable positioning of a partition wall p... | 09/25/2001 |
| 6270542 | Home and industrial heating furnace that produces fuel gas A heating furnace for home and industrial use, having the ability to catalyze fuel oil to produce fuel gas for external applications. The heat produced can be radiated, or can be circulated by a heated air or heated water system.... | 08/07/2001 |
| 6209624 | Gas-to-gas heat exchangers for use in sulphuric acid plants A heat exchanger for use in a sulphuric acid manufacturing plant to effect heat transfer between desired gas streams selected from air, sulphur dioxide and sulphur trioxide. The exchanger provides for hot or cold split flow gas streams through the exchang... | 04/03/2001 |
| 6145500 | Heating device The heating device has a housing and a liquid containing compartment defined inside the housing. A heating chamber is disposed inside the housing and the compartment. A fire chamber is disposed inside the heating chamber that produces hot combustion gases... | 11/14/2000 |
| 6125840 | Heating appliance for apartments The invention relates to a heating appliance comprising an outer case made entirely of chrome, with various brick systems arranged inside the case. Within the brick systems is arranged a required quantity of chrome pipes, which ensure that the flames are ... | 10/03/2000 |
| 6123064 | Evolving heating concept A heating system has a modular section which can be converted to use as a store or boiler and to burn either solid or liquid and gaseous fuels. The system can be further expanded by addition of more than one module to increase the heating capacity of the ... | 09/26/2000 |
| 6109339 | Heating system A heating system uses a dynamic thermal stabilizer for receiving, mixing, holding and outputting a circulating heat exchange liquid in a fashion similar to the use of a flywheel in the mechanical arts. Liquid is returned to the dynamic thermal stabilizer ... | 08/29/2000 |
| 6041771 | Apparatus and method of automatically regulating intake of air into heating unit This invention relates to a novel apparatus and method for automatically and dynamically regulating the intake of air into the combustion chamber of a heating unit such as a wood burning stove, furnace, or fireplace to ensure even and efficient burning of... | 03/28/2000 |
| 6029648 | Outside wood-burning furnace A natural draft furnace has a firebox inside a water box with fire tubes containing water running through the firebox, flues from the firebox running through the water box, a front/fire door of double wall construction to preheat entering air, a damper in... | 02/29/2000 |
| 5865165 | Gas fired fireplace boiler A low profile, high efficiency, fireplace boiler wherein a burner tray supports a number of gas fired burners and artificial logs within a hearth area of the firebox and about which logs the gas and flames are distributed. Combustion air is drawn from a c... | 02/02/1999 |
| 5796915 | Hot water heater with refuse incinerator A hot water heater burns inflammable waste articles to heat water. A primary combustion chamber is defined within a water chamber for burning inflammable waste articles. A heating element is mounted around the primary combustion chamber to produce heat fo... | 08/18/1998 |
| 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 |
| 5687908 | Non-condensing dual temperature combination space heating and hot water system A single system for providing heated water at two different temperature levels for space heating purposes and for domestic water heating purposes is provided. The system can be constructed using only one burner. The system features a first loop for circul... | 11/18/1997 |
| 5579756 | Combination heater Heating apparatus for producing both central heat and tap water, specifically adapted for trailers and similar mobile houses with small spaces is provided. The heat source is a burner combusting LP-gas. Heat cartridges for electric heating optionally prov... | 12/03/1996 |
| 5544645 | Combination water heating and space heating apparatus A combination water heating and space heating apparatus includes a water heating unit and a space heating unit releasably coupled with the water heating unit. The water heating unit has a water storage tank and a helically wound tubular heat exchanger ins... | 08/13/1996 |
| 5482027 | Partitioned bisector regenerative air heater A furnace apparatus which includes a plurality of water walls. Each includes a plurality of tubes and the water walls collectively enclose a combustion chamber. The apparatus includes a plurality of windboxes, each of the windboxes is disposed intermediat... | 01/09/1996 |
| 5377661 | Wood burning stove for heating water A stove for the generation of heat from the burning of wood for heating water and for heating the room in which it is located comprising a drum having cylindrical side walls about a horizontal axis, support legs and circular end walls; an array of tubes i... | 01/03/1995 |
| 5361751 | Combination hot air furnace and hot water heater A combination hot air furnace and hot water heater (10) having a furnace (20), a gas flow control valve (40) and a hot water heater (60) constructed as an integral assembly. Furnace (20) has furnace gas burner (33) supported below furnace heat exchanger (... | 11/08/1994 |
| 5318101 | Thermal accumulation type heating and cooling device using heat transfer medium A heating and cooling device comprising a box type heat exchange tank containing a heat transfer medium having an thermal accumulation effect therein and a heat exchange pipe arranged in said heat exchange tank. An air discharging member is mounted to an ... | 06/07/1994 |
| 5305735 | Direct fired hot water generator with more than one heat exchange zone A container having a chamber with a cool water inlet disposed at the top thereof in a burner near the bottom thereof. An exhaust for flue gases is disposed at the top of the container. A first heat exchange zone is disposed in the chamber above the burner... | 04/26/1994 |
| 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 |
| 5273209 | Heat exchange and fuel feed apparatus for vertical furnace A heating unit and solid fuel feeder comprises a vertical furnace having a combustion chamber for burning solid fuel, a water jacket around the combustion chamber and an exhaust chamber at an upper outlet end of the combustion chamber. A plenum box is con... | 12/28/1993 |
| 5097802 | Condensing furnace with submerged combustion A high efficiency furnace having a substantially continuous wet heat exchanger wherein such continuous wet operation is provided by raising the dew point of the combustion products by submerged combustion before introduction into said head exchanger. That... | 03/24/1992 |
| 5076494 | Integrated hot water supply and space heating system An integrated system for both space and water heating. Heating is accomplished in a condensing heating module having a small hot water storage reservoir to reduce burner cycling during periods of low demand. The space heating system includes a fluid flow ... | 12/31/1991 |
| 5074464 | Forced draft direct vent system for a water heater A combined air and water temperature conditioning system provides for the heating of potable water and for the heating and cooling of indoor room air in a compact arrangement of components. A domestic type gas water heater having a driven draft direct ven... | 12/24/1991 |
