Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7351041 | Fan with reduced noise generation Axial flow fan propellers are provided with a roughened portion along the trailing edge of the fan blades on the pressure side of the blade to minimize tonal acoustic emissions generated by laminar boundary layer vortex shedding. The roughened portion may be provide... | 04/01/2008 |
| D532502 | Air conditioner unit | 11/21/2006 |
| 7137268 | Vibration dampening device A device is provided for dampening compressor-induced vibration in an air conditioning system of the type having an indoor unit, an outdoor unit and a refrigerant conduit therebetween. The outdoor unit includes a compressor that is operable to circulate a vapor comp... | 11/21/2006 |
| 7131287 | Air conditioning system with vibration dampening device A device is provided for dampening compressor-induced vibration in an air conditioning system of the type having an indoor unit, an outdoor unit and a refrigerant conduit therebetween. The outdoor unit includes a compressor that is operable to circulate a vapor comp... | 11/07/2006 |
| 6978909 | Condensate drain pan for air conditioning system A drain pan for capturing condensate from a cooling coil in an air conditioning system is configured to facilitate condensate drainage from the pan and to inhibit accumulation of condensate therein. The pan includes troughs for collecting condensate and for channeli... | 12/27/2005 |
| 6950606 | Air conditioning apparatus with blower and electric heater in common housing Air conditioning apparatus is provided in which an air blower and an electric heater assembly are located in a common housing with the heater assembly projecting into the housing from a wall thereof in transverse relationship to the blower. This configuration elimin... | 09/27/2005 |
| 6945320 | Tubular heat exchanger with offset interior dimples A tubular heat exchanger has at least one pair of dimples which are extruded into at least one tube of the heat exchanger by deforming the tube wall inwardly. The dimples of each pair are in generally facing relationship, but are offset with respect to each other al... | 09/20/2005 |
| 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 |
| 6644049 | Space conditioning system having multi-stage cooling and dehumidification capability In accordance with the present invention, a space conditioning system having multi-stage cooling and dehumidification capability is provided. The system includes plural refrigeration circuits operable in a cooling mode to provide cooled air to an indoor s... | 11/11/2003 |
| 6616877 | Resilient article and method of manufacturing same using recycled material A resilient article and method of manufacturing the same using recycled materials are described. Predetermined amounts of thermoset material and thermoplastic binder are mixed and extruded into a die, from which the mixture emerges in the form of a sheet ... | 09/09/2003 |
| 6571566 | Method of determining refrigerant charge level in a space temperature conditioning system In accordance with the present invention, a method of determining refrigerant charge level in a space temperature conditioning system includes the steps of establishing a relationship between at least one selected system operating parameter and refrigeran... | 06/03/2003 |
| 6485294 | NOx reduction device In a gas-burning apparatus, such as a furnace, a device for reducing NOx emissions includes a cup member mounted proximate to an inlet to a combustion chamber of the apparatus and a perforate member attached to the cup member and located in the combustion... | 11/26/2002 |
| 6463747 | Method of determining acceptability of a selected condition in a space temperature conditioning system In accordance with the present invention, a method of determining acceptability of a selected condition in a space temperature conditioning system is comprised of the steps of perturbing the system while it is in operation by changing operation of at leas... | 10/15/2002 |
| 6427461 | Space conditioning system with outdoor air and refrigerant heat control of dehumidification of an enclosed space A space conditioning system for controlling the temperature and humidity of air within an enclosed space includes a vapor compression refrigeration unit having a reheat coil disposed downstream of the system evaporator coil to reheat return air after cool... | 08/06/2002 |
| 6390180 | Heat exchanger isolation device In a space conditioning system, such as a central air conditioning or heat pump system, a unit of the system has a heat exchanger made of a predetermined first type of metal (e.g., aluminum) and a cabinet in which the heat exchanger is mounted, which is m... | 05/21/2002 |
| 6321548 | Apparatus for automatically closing a cooling system expansion valve in response to power loss In a space cooling system having an evaporator in heat exchange relationship with a space to be cooled, a condenser external to the space, a compressor for circulating heat transfer fluid between the evaporator and condenser, an expansion valve for contro... | 11/27/2001 |
| 6318150 | Apparatus for sampling gas in a combustion appliance Apparatus is provided for sampling gas in operative association with a combustion appliance, such as a furnace. The combustion appliance includes a first conduit through which combustion air is supplied to the appliance and a second conduit through which ... | 11/20/2001 |
| 6318118 | Evaporator with enhanced refrigerant distribution An evaporator for evaporating a phase change refrigerant in a space conditioning system such as an air conditioner, heat pump or refrigeration system, is provided. The evaporator includes an inlet for introducing the refrigerant into the evaporator, an ou... | 11/20/2001 |
| 6155075 | Evaporator with enhanced refrigerant distribution An evaporator for evaporating a phase change refrigerant in a space conditioning system, such as an air conditioner, heat pump or refrigeration system, is provided. The evaporator includes an inlet for introducing the refrigerant into the evaporator, an o... | 12/05/2000 |
| 6138464 | Defrost control for space cooling system An improved defrost controller is provided for a space cooling system of the type having an evaporator in heat exchange relationship with a space to be cooled, a condenser external to the space, a compressor for circulating heat transfer fluid between the... | 10/31/2000 |
| 6095794 | Fireplace burner apparatus An improved fireplace assembly is described having a folded sheet metal burner manifold divided into three regions, being an upper burner, a lower burner and an intermediate communicating riser. This single manifold chamber is provided with two separate g... | 08/01/2000 |
| 6076371 | Frozen beverage storage and dispensing apparatus Improved apparatus for storing and dispensing material, such as a beverage, in at least a partially frozen state. The apparatus includes a tank in which the material is stored under pressure and a manually operable valve for controlling the dispensing of ... | 06/20/2000 |
| 6024713 | Leg support apparatus A leg support apparatus is comprised of a pair of upper frames and a pair of lower frames pivotally connected at respective pivot joints. The upper frames are connected to a circumferentially adjustable cuff, which is adapted to be wrapped around the thig... | 02/15/2000 |
| 6016864 | Heat exchanger with relatively flat fluid conduits An improved heat exchanger (60) includes plural relatively flat conduits (62) adapted to accommodate passage of heat transfer fluid therethrough. Each conduit (62) has inlet and outlet openings, a supply channel (100) communicating with the corresponding ... | 01/25/2000 |
| 6000424 | Apparatus for expelling air from a liquid storage tank Apparatus for expelling air from a liquid storage tank, such as a hot water storage tank includes a bleed line coupled between a water circulating pump discharge conduit and a hot water discharge line emanating from tank 10. The bleed line is connected to... | 12/14/1999 |
| 5984198 | Heat pump apparatus for heating liquid Heat pump apparatus for heating liquid, such as water, includes a refrigerant circuit and a water circuit, a refrigerant-to-water heat exchanger and an air-to-refrigerant heat exchanger operably disposed in heat exchange relationship with a air fluid stre... | 11/16/1999 |
| 5970726 | Defrost control for space cooling system An improved defrost controller is provided for a space cooling system of the type having an evaporator in heat exchange relationship with a space to be cooled, a condenser external to the space, a compressor for circulating heat transfer fluid between the... | 10/26/1999 |
| 5927393 | Heat exchanger fin with enhanced corrugations A heat exchanger fin having enhanced corrugations is provided. The corrugations define a generally sinusoidal wave pattern in a transverse direction across the fin. The fin is particularly well-suited for use in a heat exchanger, such as an evaporator or ... | 07/27/1999 |
| 5873519 | Electronic thermostat with multiple program options An electronic thermostat is provided with multiple program options respecting particular days per week and particular periods in each day for which the temperature setpoint is discretely programmable. The user may select from among four program options. T... | 02/23/1999 |
| 5867962 | Truss with trimmable ends and metal web connectors A load bearing truss includes generally parallel first and second chords and a plurality of V-shaped metal webs interconnecting the first and second chords. Respective portions of the first and second chords extend beyond the webs at each end of the truss... | 02/09/1999 |
| 5867963 | Trimmable truss apparatus An improved trimmable truss apparatus and method are disclosed, the truss having upper and lower plates centrally interconnected by diagonal web members, and each respective end providing a trimmable section comprising extended upper and lower chords crea... | 02/09/1999 |
| 5826646 | Flat-tubed heat exchanger A heat exchanger with an improved flat-tubed design is disclosed. The heat exchanger includes plural tubes of relatively flat cross-section in parallel array. Each tube is comprised of relatively flat first and second plates in facing contact. The first p... | 10/27/1998 |
| 5813574 | Frozen beverage dispensing apparatus Improved frozen drink dispensing apparatus includes a container for storing a beverage under pressure in at least a partially frozen state, a normally closed dispensing valve mounted with the container and a manually operable lever for operating the dispe... | 09/29/1998 |
| 5771964 | Heat exchanger with relatively flat fluid conduits An improved heat exchanger includes plural relatively flat conduits adapted to accommodate passage of heat transfer fluid therethrough. Each conduit has inlet and outlet openings, a supply channel communicating with the corresponding inlet opening to dire... | 06/30/1998 |
| 5768091 | Circuit breaker mounting bracket A circuit breaker mounting bracket is comprised of a generally upright support member, a base member extending generally perpendicularly from a bottom of the support member, a flange depending from a distal end of the base member at an angle less than 90Â... | 06/16/1998 |
| 5752500 | Draft hood locating device for combustion apparatus A draft hood is provided for mating alignment with a fireplace assembly. The mating alignment is facilitated by the location of alignment hardware fixed to the rear surface of the fireplace and to the inside of the draft hood. In use the hardware permits ... | 05/19/1998 |
| 5749355 | Multi-position furnace with condensing heat exchanger A furnace is adapted for operation in downflow, left horizontal flow and right horizontal flow positions. The furnace includes plural burners, a two-stage heat exchanger, a header box at the heat exchanger outlet for collecting products of combustion from... | 05/12/1998 |
| 5722485 | Louvered fin heat exchanger An improved louvered fin heat exchanger having plural fins arranged in substantially parallel, closely spaced relation and a plurality of heat transfer tubes passing through aligned openings in the fins is disclosed. Each fin includes a plurality of first... | 03/03/1998 |
| 5690470 | Blower housing and apparatus for assembly thereof A housing for an air blower is assembled by providing first and second panels having respective first and second curved edges and a third panel having opposed first and second flanges. The first and second flanges define respective elongated first and sec... | 11/25/1997 |
| 5682752 | Refrigerant management control and method for a thermal energy storage system Refrigerant management control is provided for an air conditioning system (10) with cool thermal energy storage. The system includes a compressor (18), a condensing unit (12), a temporary refrigerant storage vessel (28), a storage module (14) containing a... | 11/04/1997 |
