Abstract: A combination food preparation and self-serve delivery system includes a housing and a food preparation compartment located in a rear section of the housing, the food preparation compartment including a first heating element for heating food placed in the food preparation compartment. The system also includes a self-serve compartment located in a front section of the housing for holding finished food product, the self-serve compartment including a second heating element for heating the finished food product placed therein. The first and second heating elements are separate and are adapted to operate independently of one another.

Abstract: An oven for transferring heat to food in trays and a method for using the oven. The oven includes a cabinet with partitions dividing the interior into a plurality of separate, thermally isolated holding compartments each adapted for removably receiving a tray of food. Heat sources above the tray emit radiant heat to warm the food in the trays. A control mechanism controls the duration of the total hold time for the food having a duration of heated holding time during which a respective heat source is activated. The oven. also includes a forced air mechanism under the control of the control mechanism for delivering forced air into the compartments. The heat sources are activated and deactivated during successive duty cycles to thereby to maintain the food in a respective compartment at a selected holding temperature for a duration of heated holding time.

Abstract: A combination food preparation and self-serve delivery system includes a housing and a food preparation compartment located in a rear section of the housing, the food preparation compartment including a first heating element for heating food placed in the food preparation compartment. The system also includes a self-serve compartment located in a front section of the housing for holding finished food product, the self-serve compartment including a second heating element for heating the finished food product placed therein. The first and second heating elements are separate and are adapted to operate independently of one another.

Abstract: A system for heating optical members includes a thermally-conductive inner housing defining an interior volume for receiving an optical member to be heated, a thermally-insulative outer housing at least partially containing the thermally-conductive inner housing, and a heating structure disposed outside the inner housing and configured to provide heat through the thermally-conductive inner housing and into the interior volume defined by the inner housing.

Abstract: An apparatus for heat treating semiconductor wafers is disclosed. The apparatus includes a heating device which contains an assembly linear lamps for emitting light energy onto a wafer. The linear lamps can be placed in various configurations. In accordance with the present invention, tuning devices which are used to adjust the overall irradiance distribution of the light energy sources are included in the heating device. The tuning devices can be, for instance, are lamps or lasers.

Abstract: A method and an apparatus for charging a so-called heating washer (heating cushion) (10) with heat energy to be liberated at a chosen point of time through activating the heating washer (10) when the same e.g. has been placed on stiff/tender musculature. According to the invention, the heating washer is steamed, either one or more at a time, in a steam chamber positioned above a water chamber in a steam cooking apparatus (30), wherein the water chamber is separated from the overlying steam chamber by means of a horizontally directed partition plate (34), fluid communication being maintained between the chambers. The charging of the heating washer (10) by means of steam prevents that the heating washers are damaged in the way that may happen when boiled in water.

Abstract: There is provided a baby wipes warmer for warming baby wipes while maintaining moisture and coloration thereof. Such warmer comprises a base member for supporting the warmer on a surface. A body member is engaged onto the base member and has an interior-side housing wall and an upper housing wall which collectively form an inside compartment. The warmer further includes a sponge layer which is disposed within the inside compartment and retains liquid therein. A heating element is disposed about the inside compartment for providing heat thereto. The liquid retained within the sponge layer transitions into vapors when heated by the heating element for maintaining the moisture and coloration of the baby wipes supported upon the sponge layer.

Abstract: An apparatus and method for maintaining substantially uniform temperature of semiconductor wafers and similar workpieces is provided. The method and apparatus utilize a workpiece holder that is substantially a closed chamber, which includes a wall structure including a workpiece engaging wall in thermal communication with the chamber. The workpiece holder also includes a condenser that communicates with the chamber and a heater that applies heat to the chamber. The heater applies heat to a fluid inside the chamber such that when the fluid vaporizes within the chamber the condenser abstracts the heat from the fluid. This causes continual circulation of vapor through the interior of the chamber, which helps to maintain temperature uniformity. A feedback control system connected to one or more temperature sensors can control the heater, the condenser or both so as to maintain a predetermined set point temperature within the chamber.

Abstract: A package for optical components includes an inner package enclosing the optical component, and an outer package enclosing the inner package. A heater may be disposed in the inner package proximate the optical component to control its temperature, and to maintain this temperature control, the outer package creates an isolated air pocket around the inner package, which thermally insulates the inner package from the outside environment. The outer package is formed of a material having low thermal conductivity, to promote this insulating function. This package is especially useful if the optical component comprises a planar light-wave circuit (PLC), e.g. an arrayed waveguide grating (AWG), which requires tight temperature control and structural integrity to maintain the integrity of the optical paths.

Abstract: A container for storing hazardous material and a method of enclosing hazardous material in a concrete container body defining a storage space and having an access opening for introducing the hazardous material in the storage space comprises fluid-tight sealing of the storage space by introducing a closure body of concrete in the opening subsequent to the introduction of the hazardous material. The closure body is formed by casting concrete in the access opening subsequent to the introduction of the hazardous material in the storage space and allowing the concrete to harden while supplying heat to the portion of the concrete container body surrounding the access opening.

Abstract: A housing is provided for maintaining a planar lightguide circuit at a temperature within a predetermined temperature range independent of ambient temperature. The housing includes a planar heating arrangement supporting and in thermal contact with the planar lightguide circuit. Also included is a frame assembly having a first surface on which the planar heating arrangement is fixed. The frame assembly has at least one opening through which extends at least one optical fiber coupled to the planar lightguide circuit. An overmold, which is molded around the frame assembly, includes at least one strain relief member through which the optical fiber extends.

Abstract: An apparatus for thermally cycling samples of a biological material including a thermal block assembly including a plurality of sample holders for receiving samples of biological material; a heat sink thermally coupled to the thermal block assembly, the heat sink transferring heat away from the thermal block assembly to ambient air in contact with the heat sink; a first heat source thermally coupled to the thermal block assembly to provide heat to the thermal block assembly; and a second heat source thermally coupled to the first heat source and configured to provide heat to a portion of the first heat source. The arrangement of the heat sink, first heat source and second heat source can provide substantial temperature uniformity among the plurality of sample holders. The invention also includes a method for thermally cycling samples of biological material.

Abstract: A small electric oven includes a base unit and a lid unit hinged to close over the base unit. A lower heat transmissive cooking platen is supported by the base unit and arranged such that any liquid on the platen drains in use towards one end of the platen. An upper heat transmissive cooking platen is supported inside the lid and fits over the lower cooking platen to define a heat transmissive cooking chamber that completely encloses a food item without direct contact with an upper portion of the food item. Electric heating elements are provided for each of the platens.

Abstract: Methods and apparatuses are disclosed for automatic process control of firing and biasing a heated-electrode refrigerant sensor for use in a refrigerant detector. An unfired sensor may be mounted in a manufacturing station, and while remaining mounted may be electrically heated by applying current and adjustably controlling the amount of power to gradually increase the temperature. Once the sensor reaches a suitable temperature, the sensor is fired, and while the temperature of the sensor is elevated, the sensor is biased. The temperature increase may take place at a first rate until substantially all the moisture is removed, and then at a second rate. Upon reaching the bias temperature, the temperature may be held generally constant for a first period of time before increasing to a second bias temperature for a second period of time.

Abstract: An infant-support heater assembly having a heater element a radiator associated with the heater element and a sensing element in contact with at least a portion of the radiator. The sensing element is separate from the heater element.

Abstract: There is provided a baby wipes warmer for warming baby wipes while maintaining moisture and coloration thereof. Such warmer comprises a base member for supporting the warmer on a surface. A body member is engaged onto the base member and has an interior-side housing wall and an upper housing wall which collectively form an inside compartment. The warmer further includes a sponge layer which is disposed within the inside compartment and retains liquid therein. A heating element is disposed about the inside compartment for providing heat thereto. The liquid retained within the sponge layer transitions into vapors when heated by the heating element for maintaining the moisture and coloration of the baby wipes supported upon the sponge layer.

Abstract: A thermal cycling device for biological samples. The thermal cycling device may include a sample block, an annular plate, and a plurality of spring devices interposed between the sample block and the annular plate. The sample block has a plurality of openings for receiving sample wells of a sample well tray. The annular plate may be positioned adjacent the outer periphery of the sample block and may be configured to abut a bottom surface of the sample well tray when the sample well tray is positioned thereon. The plurality of spring device may be interposed between the sample block and the annular plate to urge the annular plate and sample well tray away from the sample block.

Abstract: A freestanding cover for a food tray has a flange section and a support section extending downwardly from the flange section. The support section supports the cover independently of the tray, with the flange section positioned above the tray opening. The freestanding cover is inserted into a heated compartment in a food warming cabinet and is supported on a retaining mechanism positioned on the shelf of the food warming cabinet. The retaining mechanism, in the form of a wire rack, prevents the cover from moving forward or backward. With the cover retained by the wire rack, a tray containing previously cooked food portions may be inserted into and removed from a receiving space in the cover, leaving the cover inside of the compartment.

Abstract: A device for dispensing hydrogen, in particular for supplying gaseous hydrogen for a fuel cell, has a reservoir, a gas connection for removing hydrogen from the reservoir and at least one heating device with which the reservoir is heatable for dispensing hydrogen. In addition, the reservoir is subdivided into at least two modules which are heatable independently of one another.

Abstract: A hearing aid drying device for receiving and heat-drying one or more hearing aids. The device includes an electrical outlet-supported and electrically actuated wall light having a base with electrical contacts for operative engagement into an electrical outlet and an electric light bulb operatively supported in the base. A support member is connected to the base and a container is connected to the support member in a position directly above and in close proximity to the light bulb. The container preferably includes a closeable lid and defines an interior volume adapted to receive at least one hearing aid placed therein whereby moisture in the hearing aid accumulated. during use thereof is heated sufficiently by the light bulb to cause the moisture to evaporate. Apertures formed through the lid and bottom of the container facilitate circulation of heated air through the interior volume.

Abstract: A merchandiser for displaying food products and holding such food products at a controlled temperature has a well divided into three or more well sections, wherein each of the well sections receives a serving tray and wherein the serving trays collectively have a center line. A rear access door, a pair of side plates, and a transparent front plate, together with the well, define a food product holding cavity. A pair of supporting brackets position a merchandiser heating and control device above the well. The merchandiser heating and control device has a heating compartment, which positions three or more heating elements and three or more illuminating elements substantially above the center line of the serving trays, wherein the heating compartment includes three or more circulating fans for circulating heated air from the heating compartment into the holding cavity.

Abstract: A holder for a dispenser package having a resealable cap assembly with an outer perimeter includes a front wall, a rear wall and a bottom wall interconnecting lower ends of the front and rear walls, the front, rear and bottom walls defining a receiving area for the dispenser package, the front wall including an aperture defined by inner peripheral edges of the front wall. The holder also includes a heating element in thermal communication with at least one of the front, rear and bottom walls, a power source connected with the heating element, and at least one actuator provided at the inner peripheral edges of the front wall aperture, the at least one actuator being in communication with the heating element. The at least one actuator is movable between a first position for activating the heating element and a second position for deactivating the heating element.

Abstract: A chafing or warming dish construction typically used for buffet serving of comestibles having user sensing means which automatically opens and closes an overlying cover depending upon the presence of the user at a serving table. In a disclosed embodiment, the cover is arranged for pivotal rotation about a pair of aligned pintles.

Abstract: Apparatus and methods for automatically staining or treating multiple tissue samples mounted on microscope slides are provided. Individualized slide temperature control is accomplished by the heating system according to the present invention that has thermal platforms radially mounted to the carousel for heating the slides and sensing the temperature of each. The heating system also permits automated de-waxing if necessary.

Abstract: A system and method for quickly heating a shrinkable casing around a relatively non-shrinkable object. As one example, the present invention may be used to shrink a sleeve around a strand, such as fiber or copper. A contact approach to heating the a loaded sleeve is used wherein a predetermined temperature profile is applied to prevent the trapping of air during shrinking. The thermal profile may be selectively controlled by the application of a fluid to the junction where heat is applied to the loaded sleeve.

Abstract: A resistance element (19) for a device for shrinking shrinkable sleeves comprises an elongate electrical conductor extending in a zigzag pattern and bent to a tunnel shape. The shrinkable sleeve including for example an optical fiber enclosed therein is placed in that region of the resistance element (19), which corresponds to approximately the geometric axis of the upper semi-cylindric portion of the tunnel shape. The resistance element (1) has attachment pins (33) and contact and attachment pins (35) at its front and rear sides respectively intended to be placed in corresponding recesses in a lid of the device. The rear contact and attachment pins (35) have portions (39) intended for contact with elastic, electrically conducting contact pins with which the resistance element (19) comes in contact, when the lid is folded down to perform the shrinking operation.

Abstract: A package for optical components includes an inner package enclosing the optical component, and an outer package enclosing the inner package. A heater may be disposed in the inner package proximate the optical component to control its temperature, and to maintain this temperature control, the outer package creates an isolated air pocket around the inner package, which thermally insulates the inner package from the outside environment. The outer package is formed of a material having low thermal conductivity, to promote this insulating function. This package is especially useful if the optical component comprises a planar light-wave circuit (PLC), e.g. an arrayed waveguide grating (AWG), which requires tight temperature control and structural integrity to maintain the integrity of the optical paths.

Abstract: Some of the blind holes (6) between indentations (4) of a heating surface (3) contain lifting elements (7) which, after opening of a cover, release a microtitre plate (13) from the heating surface (3) and raise said microtitre plate about 2 to 3 mm, so that it can be removed without application of force. Each lifting element (7) consists of a coil spring (8) and a contact pin (9) made of, for example, PEEK which is inserted into said coil spring and presses with a round flat abutting surface (12) against the lower surface of the microtitre plate (13). The spring constant of the lifting element (7) is about 6 N/mm.

Abstract: A low temperature storage cabinet wherein a heater is embedded in an opening frame structure of the cabinet to prevent the occurrence of dewfall on a surface of the frame structure to be brought into contact with a door hinged to the cabinet body, and wherein operation of a compressor is controlled in accordance with an inside temperature of the cabinet to maintain the inside temperature of the cabinet at a predetermined value. In the storage cabinet, the heater is activated synchronously in response to operation of the compressor and is activated in accordance with outside humidity or inside temperature of the cabinet during stopping of the compressor.

Abstract: A vacuum oven for decontaminating items, a system incorporating multiple vacuum ovens and a method of operating such system are provided. The ovens are portable. They can have a vacuum drawn in them and can be heated by being coupled to a vacuum and a power source, respectively at a first location and then be decoupled from the vacuum and power sources and moved to a second location such as a glove box or clean room while still maintaining a vacuum.

Abstract: An infant-support heater assembly having a heater element a radiator associated with the heater element and a sensing element in contact with at least a portion of the radiator. The sensing element is separate from the heater element.

Abstract: An oven for maintaining cooked foods at temperatures suitable for serving the foods or even for cooking foods has a cabinet containing multiple heat sinks of channel-shaped configuration. The ends of the heat sinks open out of the cabinet, so that any heat sink may receive a tray of food from either the front or back of the cabinet. The interior surface of the heat sinks generally conform to the cross-sectional shapes of the trays, so that the heat sinks lie along the bottoms and sides of the trays. The heat sinks have a heating elements extended along their sides and bottoms for elevating the temperature of the heat sinks and directing heat into the trays within the heat sinks. In addition, each heat sink also contains a cover which may close the top of the tray in the heat sink and thereby retard the escape of moisture from the tray or may vent the interior of the tray.

Abstract: A hydrogen storage device prevents localization of hydrogen occlusion alloy and ensures rapid discharge of hydrogen. The hydrogen storage device has a plurality of porous molded pieces arranged longitudinally at predetermined intervals. Conductive cushioning materials are inserted between the molded pieces and between the molded pieces and an adiabatic insulation material. The conductive cushioning materials include first conductive cushioning materials inserted between the adiabatic insulation material and upper and lower end surfaces of the molded pieces and second conductive cushioning materials inserted between left and right end surfaces of the adiabatic insulation material. Disposed at opposed ends of a row of the molded pieces are movable urging electrodes which can move in response to dimensional changes of the molded pieces resulting from their volume changes and which urge the molded pieces to constantly maintain physical contact between the molded pieces and lids.

Abstract: A hot air towel warmer comprising a substantially air tight enclosure having an access door to enable placing a towel to be warmed in the enclosure and to enable removing the warmed towel therefrom; a shelf disposed within the enclosure having perforations therethrough to support the towel; a blower disposed within the enclosure adjacent to the shelf to create a stream of air and to continuously circulate the stream of air within the enclosure for passage through the perforations of the shelf and the towel; a resistance coil heater disposed within the enclosure adjacent the blower to heat the stream of air; an electrical control circuit disposed within the enclosure associated with the stream of air, the blower and the heater to automatically maintain the stream of air at a temperature within a predetermined temperature range for a given period of time or until the access door is open, whichever comes first and to prevent scorching of the towel should a short circuit occur in the parts of the electrical contr

Abstract: An electrical cooking device (10) for a bulb or more of garlic including a lower bowl-like cooking plate (22) with circular peripheral walls (46) extending upward having a annular beveled rim (32) and an upper domed cooking plate (20) having a recessed annular beveled rim (34) when in a closed position align in nestable cooperation to form a cooking chamber (30) in which one or more bulbs of garlic can be cooked quickly and efficiently.

Abstract: A holder for a dispenser package having a resealable cap assembly with an outer perimeter includes a front wall, a rear wall and a bottom wall interconnecting lower ends of the front and rear walls, the front, rear and bottom walls defining a receiving area for the dispenser package, the front wall including an aperture defined by inner peripheral edges of the front wall. The holder also includes a heating element in thermal communication with at least one of the front, rear and bottom walls, a power source connected with the heating element, and at least one actuator provided at the inner peripheral edges of the front wall aperture, the at least one actuator being in communication with the heating element. The at least one actuator is movable between a first position for activating the heating element and a second position for deactivating the heating element.

Abstract: An NMR sample, frozen in a tube and having achieved a specified higher degree of polarization for an NMR experiment, is rapidly heated and melted before it loses a significant portion of the achieved polarization and still retains 10% or more. The heating may be achieved by passing an electric current, or currents, through a heating wire, or wires, provided to the tube, or by placing the tube inside a furnace provided with an electric radiator. NMR experiments with high sensitivity can be carried out with such a sample still retaining a high level of polarization.

Abstract: A redundant package for optical components includes an inner package enclosing the optical component, and an outer package enclosing the inner package. A heater may be disposed in the inner package proximate the optical component to control its temperature, and to maintain this temperature control, the outer package creates an isolated air pocket around the inner package which thermally insulates the inner package from the outside environment. The outer package is formed of a material having low thermal conductivity, to promote this insulating function. This package is especially useful if the optical component comprises a planar lightwave circuit (PLC), e.g., an arrayed waveguide grating (AWG), which requires tight temperature control and structural integrity to maintain the integrity of the optical paths.

Abstract: A merchandiser and method for displaying and warming previously baked dough products, such as cookies, under controlled drying conditions, including an enclosure having one or more wall members that define an interior space, with at least a portion of one of the wall members being transparent, an aperture for access into the interior space, at least one support surface for supporting one or more previously baked dough products that contain a predetermined average moisture level therein, and at least one mounting structure associated with the enclosure for mounting and positioning each support surface at a user accessible location in the interior space of the enclosure, and a heat source for providing heated air in the enclosure wherein the support surface contacts at least a portion of the previously baked products so that those portions are shielded from direct contact with the heated air such that the drying of moisture in the baked products is controlled to maintain the organoleptic and/or texture properti

Abstract: A dry sterilizer includes a container for containing beads, a heater, and a resilient member disposed adjacent to an opening of the container. An instrument, after sterilization, is tapped against the resilient member to remove beads attached to and lodged in the instrument and the removed beads are returned to the container. The resilient member prevents beads from entering a housing of the sterilizer by blocking a gap between the container and the housing at the opening.

Abstract: A system and method for quickly heating a shrinkable casing around a relatively non-shrinkable object. The system may be referred to as a sleeve shrinking quick dip heat system. As one example, the present invention may be used to shrink a sleeve around a strand, such as fiber or copper. In the electrical and electronic fields, the present invention may be used to shrink sleeves or tubing around, for example, copper strands, wires, connectors, or components. A contact approach to heating the a loaded sleeve is used wherein a predetermined temperature profile is applied to prevent the trapping of air during shrinking. Ramp-up time is eliminated by use of a heater block that remains near or at heat shrinking temperatures, while selectively transferring heat to the sleeve according to the desired temperature profile.

Abstract: A microtiter plate system includes an integral heater. In an embodiment, the integral heater includes a heater plate. In another embodiment, the integral heater includes resistive heater wires positioned beneath and/or between the wells of a microtiter plate. In an embodiment, the microtiter plate system includes optically clear well bottoms that permit sensing and measurement of samples through the optically clear well bottoms. In an implementation, an optically clear heater is positioned beneath the optically clear well bottoms. In an alternative implementation, resistive heater wires are positioned between the wells. In an embodiment, the microtiter plate system includes a microtiter plate lid with an integral heater, which can be implemented using a heater plate, resistive wires, and the like.

Abstract: A redundant package for optical components includes an inner package enclosing the optical component, and an outer package enclosing the inner package. A heater may be disposed in the inner package proximate the optical component to control its temperature, and to maintain this temperature control, the outer package creates an isolated air pocket around the inner package which thermally insulates the inner package from the outside environment. The outer package is formed of a material having low thermal conductivity, to promote this insulating function. This package is especially useful if the optical component comprises a planar lightwave circuit (PLC), e.g., an arrayed waveguide grating (AWG), which requires tight temperature control and structural integrity to maintain the integrity of the optical paths.

Abstract: An auxiliary modular oven assembly for use with a gas chromatograph. The auxiliary oven assembly is comprised of a housing, an oven compartment, a heater, at least one sampling valve, at least one fixed volume sample loop, and at least one chromatograph column or column trains, wherein the column or column trains contains a material capable of causing the separation of chemical components of a chemical sample at elevated temperatures.

Abstract: An infant-support heater assembly having a heater element a radiator associated with the heater element and a sensing element in contact with at least a portion of the radiator. The sensing element is separate from the heater element.

Abstract: Remote activation mechanism for equipment regulated deployment or release, that includes a cylindrical housing (1), connected by means of a rod (10) with the external equipment to be deployed including the acting mechanism, and has adhered a fusible material band in its internal surface (11). Inside the housing a cylindrical frame (2) connected with the fixed part of the equipment is disposed. That frame is provided with means to perform the local and progressive fusion of the fusible material band. Additionally a cylindrical sealing piece (3) is disposed in between the fusible material band (11) and the frame (2).

Abstract: A surgical warming system includes at least one and generally two or more compartments, whereby each compartment is separately heatable and controllable over its own range of temperatures. The compartments may be implemented as separate warmer units in stacked relation. Alternatively, the compartments may be constructed into a single cabinet structure. The heat within each compartment is provided by forcing air through a heating chamber and into the compartment whereby the forced air is recycled and mixed with make-up air. Each individually controllable compartment enables an operator to simultaneously maintain the individual compartments of the same warming system at different desired temperatures. In addition, the warming system further includes for each compartment a display and a tray or drawer with individual receptacles and corresponding monitoring assemblies in order to indicate the temperature and residence time of each item heated within that compartment.

Abstract: An automatic temperature control device comprises a reaction chamber for housing a vessel, a tray for supporting the vessel, a temperature control part for controlling at least the temperature in the reaction chamber, a transfer means for slidably moving the tray such that the tray may freely enter or withdraw from the reaction chamber, a first cover part for closing up the reaction chamber tightly when the tray is made to enter the reaction chamber by the transfer means, a second cover part for closing up the reaction chamber tightly when the tray is made to withdraw from the reaction chamber by the transfer means, and first and second magnets for holding the second cover part in a tightly closed-up state, wherein the tray for supporting the vessel is allowed to move slidably in linkage with the pivotal motion of the cover for pivoting the cover and also making the vessel to enter or withdraw from the reaction chamber in one operation.

Abstract: A structure and an associated method are provided for housing a workpiece during curing such that the cure process may be accelerated without requiring the use of a relatively expensive cure room. The structure includes a cure room, typically formed by a tent, that defines a cure chamber in which the workpiece is disposed. The tent is generally at least partially retractable to permit introduction and removal of the workpiece. The tent typically includes a frame and a covering supported by the frame. The covering may be formed of a relatively flexible cloth and preferably has an inner surface formed of a thermally insulating, heat reflecting, fire resistant material. The structure is preferably portable and, as such, may include means, such as a plurality of wheels, for moving the cure room, typically defined by the tent, between the first and second locations.

Abstract: An oven for maintaining cooked foods at temperatures suitable for serving the foods or even for cooking foods has a cabinet containing multiple heat sinks of channel-shaped configuration. The ends of the heat sinks open out of the cabinet, so that any heat sink may receive a tray of food from either the front or back of the cabinet. The interior surface of the heat sinks generally conform to the cross-sectional shapes of the trays, so that the heat sinks lie along the bottoms and sides of the trays. The heat sinks have a heating elements extended along their sides and bottoms for elevating the temperature of the heat sinks and directing heat into the trays within the heat sinks. In addition, each heat sink also contains a cover which may close the top of the tray in the heat sink and thereby retard the escape of moisture from the tray or may vent the interior of the tray.