Abstract: The temperature indicating surface, typically a label, includes an irreversibly fusible coating which changes from a first appearance to a second appearance in response to exposure to a threshold temperature or rated temperature. An in situ standard is provided by initially fusing selected areas of the temperature indicating surface so that a pattern is visible prior to exposure to the threshold temperature. Upon exposure to the threshold temperature, however, the entire temperature indicating surface is fused thereby presenting a uniform appearance and unambiguous evidence of prior exposure to the threshold temperature.

Abstract: A calibration device for performing a temperature calibration of the temperature in an oven, especially an oven adapted for thermal treatment of a dental product, includes at least one metallic

Abstract: The present invention is to provide a thermally-sensitive safety device for gas tubing including a main body provided with an inlet, an outlet and a gas passage communicated with said inlet and said outlet, and a thermally-sensitive control valve mounted in the gas passage. The control valve has a ball, which is normally biased by a spring to stop against a thermally-sensitive member, and a bushing with through hole in alignment with the ball. The thermally-sensitive member melts while ambient temperature is higher than the melting point thereof, whereby said ball is biased by said spring to contact against and seal the through hole of the bushing such that the gas passage is blocked off.

Abstract: Unique transparent plastic (preferably though not necessarily polypropylene) articles that can be tailored to become opaque when exposed to a sufficiently high temperature and which returns to substantially the same transparency level upon cooling are provided. Such formulations include polymeric constituents that exhibit melting temperatures well below that for the majority clarified polypropylene, and thus which appear to become amorphous upon exposure to temperatures above such a lower melting temperature, thereby affecting the crystalline formation of the clarified polypropylene to the extent that opacity dominates the appearance thereof. Such lower melting temperature polymeric constituents include species such as low melt flow (up to 10) metallocene polyethylene and/or low density polyethylene, both of which exhibit melting temperatures of from about 60 to about 100° C., well below the typical polypropylene melting temperatures of roughly about 150° C.

Abstract: The present invention provides an intensity modulated optical fiber temperature switching immersion probe for remote temperature monitoring and switching of an industrial process. The present invention also provides a method for remote sensing of temperature.

Abstract: The invention provides methods, apparatus, and systems for performing high-throughput preparation and screening of salts and polymorphs of drug candidates. The invention is directed towards enhancing the pre-formulation discovery process used for drug development. In particular, processes that determine suitable salts and processes that discover substantially every polymorph that can form from a particular drug candidate are provided. The processes are performed using several apparatuses that are specifically configured to carry-out various steps in a high-throughput characterization process. One such apparatus is configured for synthesizing a plurality of library members based on, for example, a library model generated by a computer system. Another apparatus may filter the synthesized solution to provide a substantially pure mixture that can be subjected to salt or polymorph testing.

Abstract: A critical temperature warning apparatus and method to monitor the thermal history of a product such as a memory card. The apparatus comprises a critical temperature indicator, which is externally attached to a product to be monitored. The indicator indicates if the product has experienced a critical temperature. The critical temperature indicator may comprise a patterned array of wax, the wax having a melting point equal to the critical temperature. If the pattern of wax has been destroyed leaving a molten wax residue, then this indicates that the product has experienced a critical temperature. The critical temperature indicator may also include thermographic inks for indicating that a critical temperature has been experienced.

Abstract: Unique transparent polypropylene articles that can be tailored to become opaque when exposed to a sufficiently high temperature and which returns to substantially the same transparency level upon cooling. Such formulations include non-polypropylene polymeric constituents that exhibit refractive index measurements similar to the base clarified polypropylene at lower temperatures, as well as melting temperatures well below that for the base clarified polypropylene. Upon exposure to temperatures in close proximity to the melting temperature of the non-polypropylene polymeric constituents, the refractive index for such constituents will then become modified to the extent that the overall article appears at least partially opaque. In particular, the non-polypropylene polymeric constituents should exhibit melting temperatures well below that for the base clarified polypropylene, from about 60 to about 100° C. (well below the typical polypropylene melting temperatures of roughly about 160-190° C.

Abstract: An apparatus to combine temperature indicator sticks used in the welding, metal fabrication, and heat treatment industries and capable of identifying a given temperature of an object is disclosed. The apparatus includes a first temperature indicator stick comprised of a compound which melts at a first temperature, and a second temperature indicator stick formed of another compound which melts at a second temperature. The Apparatus further includes a connector physically connecting the first and second indicator sticks in a single assembly. A method to provide a dual temperature indicator stick is also disclosed.

Abstract: An apparatus to combine temperature indicator sticks used in the welding, metal fabrication, and heat treatment industries and capable of identifying at least two given temperatures is disclosed. The apparatus includes a first temperature indicator stick aligned along a first axis and comprised of a compound which melts at a first temperature, and a second temperature indicator stick aligned along a second axis and formed of another compound which melts at a second temperature. The apparatus also includes a connector physically connecting and aligning the first and second indicator sticks.

Abstract: A device is mounted on a rotary spit of a rotisserie. The spit has an external handle at one end, a rod, and a connection member at the other end releasably coupled to a drive source. The device comprises temperature sensing elements on a central portion of the rod; and a thermometer on the handle, the thermometer having a sensing rod inserted into the handle to be conductive with the temperature sensing elements. After the rotisserie is activated, an internal temperature of a meat impaled by the rod being roasted is sensed by the temperature sensing elements. Next, the internal temperature of the meat is conveyed to the sensing rod from the temperature sensing elements so as to be indicated on the thermometer.

Abstract: A rotisserie system includes a rotatable skewer adapted to secure meat, the rotatable skewer including a temperature sensor for recording a temperature of the meat and a wireless transmitter for wirelessly transmitting the temperature. The system also includes a remote temperature monitor having a wireless receiver for receiving the wirelessly transmitted temperature and a visual display for displaying the temperature, whereby the remote temperature monitor is movable away from the rotatable skewer while remaining in wireless communication with the wireless transmitter to enable an operator to continuously monitor the cooking temperature of the meat. The wireless transmission and reception may be accomplished using infrared light or radio frequency waves.

Abstract: An x-ray system 20 includes an x-ray tube insert (24) that has an evacuated envelope (34), an anode assembly (38) and a cathode assembly (40). The anode assembly (38) and the cathode assembly (40) are located in operative relationship to one another within the evacuated envelope (34). A temperature indicating member (100) is located in thermally conductive contact with at least one assembly (38, 40, 66) located in the x-ray tube insert (24). The temperature indicating member (100) has a temperature sensitive characteristic which changes in response to adequate thermal exposure to at least one temperature threshold value.

Abstract: A barrier for halogenated aromatic compounds is provided, especially fluorinated hydrocarbon films useful for containing precise quantities of halogenated aromatic compounds used as thermally sensitive materials in reversible chemical thermometers. A new shape of chemical thermometer is also disclosed.

Abstract: A temperature indicator for indicating when a specified temperature has been exceeded in a fluid flow through a conduit. Such conduit having an aperture and the temperature indicator being mountable in such aperture and engagable therewith such that the temperature indicator projects through such aperture and into such fluid flow in such conduit. The temperature indicator includes a housing which substantially encloses an internal chamber and has a bore extending from the internal chamber to an external surface of the housing. An indicator member is disposed, at least in part, within the internal chamber and extends into the bore. A biasing element is disposed within the internal chamber and exerts a biasing force between the housing and the indicator member and urges the indicator member toward the bore. A bonding agent forms a bond between the indicator member and the housing to thereby restrain the indicator member from movement toward the bore under action of the biasing element.

Abstract: A temperature indicator for providing a visual indication that a pressurized fluid has exceeded a specified temperature. Such pressurized fluid being contained within a container bounded by a container wall. Such container wall being provided with an aperture for mounting of the temperature indicator therein such that the temperature indicator protrudes through such aperture and into such pressurized fluid contained within such container. The temperature indicator includes a housing member, a cavity provided in the housing member and a bore extending from an interior portion of the cavity to an exterior surface of the housing member. The exterior surface of the housing member is visible from a position external of such container when the temperature indicator is mounted in such aperture such that the temperature indicator protrudes through such aperture and into such pressurized fluid contained within such container.

Abstract: A self-updating temperature thermometer is disclosed that is capable of generating a real-time signal of core body temperature. The thermometer comprises a double-sided flexible substrate, having a first side and a second side. The first side has a plurality of cavities, and a liquid crystal composition in these cavities to define a plurality of sensor dots. A cover layer is disposed on the first side, and a pressure-sensitive adhesive is disposed on the second side of the substrate. The sensor surface area to substrate thickness is maximized using the structural features of this invention, thereby providing a thermometer exhibiting unexpectedly good results in that it is capable of generating a continuous temperature measurement that is automatically updated with changes in body temperature.

Abstract: A composition of matter suitable for use in a reversible thermometer is disclosed which comprises a thermally responsive material capable of being supercooled at least for several minutes, and subject to a change in state from a solid to a liquid substantially at a predetermined temperature; means for visually observing the change in state; and a matrix forming material comprising an amorphous organic compound, the matrix forming material being insoluble in the thermally responsive material; whereby the thermally responsive material is dispersed within the matrix forming material, the composition of matter being reversibly responsive to changes in temperature, and remaining in the liquid state for a time sufficient to permit a user of the composition to observe the change in state. The preferred matrix forming material is polyisobutylene, and the preferred thermally responsive material is a solid solution of ortho-chloronitrobenzene and ortho-bromonitrobenzene.

Abstract: The present invention provides a heat-sensitive warning device and a related method for visually detecting an increase in the temperature of the outer surface of an electrical insulator, which may indicate the unsafe flow of leakage electrical current through the electrical insulator, prior to a fire, an explosion or some other unsafe event. When the temperature of the outer surface of the electrical insulator increases to a preselected temperature, a visual indication of this rise in temperature will be provided by the ejection of a spool from a heat-sensitive warning device which has been attached to the outside of the electrical insulator.

Abstract: In welding optical fiber ribbons [by means of] using an electric arc formed between electrodes the region heated by the electric arc is mapped on CCD-elements in a camera. In the obtained picture the light intensity of those portions of the picture is determined which correspond to the heated fiber portions. This light intensity is used for setting the electric current flowing between the electrodes, so that a desired welding temperature is obtained and so that also a desired, lower temperature is obtained in the fiber ends in a preparatory softening stage, which has a long durability and which is performed before the very welding stage. This determination of temperatures [by means of] using measured light intensities gives reliable values also in the case where ambient conditions like the air pressure are changed, the state of the electrodes is changed owing to contamination, etc.

Abstract: The invention relates to a device for obtaining, in the manufacture of a high-strength composite, an indication the reinforcement layer of the composite has been wetted throughout by the matrix material of the composite. The reinforcement layer is of the type which mainly consists of fibers or fiber bundles which do not become translucent or transparent when wetted by the matrix material, such as carbon or aramide fibers or fiber bundles. The matrix material of thermosetting plastic is applied in a liquid state in the manufacture according to, for instance, the technique of hand lay-up. The reinforcement layer includes indicating fibers which become translucent or transparent when wetted by the matrix material. A good indication is obtained if the indicating fibers have such properties that they become translucent only when the adjoining reinforcing material has been completely wetted throughout.

Abstract: A time-temperature indicator label for measuring the length of time to which a product has been exposed to a temperature above a pre-determined temperature is provided. The period of time of exposure is integrated with the temperature to which the indicator is exposed. The label is a composite of a plurality of layers adapted to be adhered at its underside to a product container. The label includes a printable surface layer, a longitudinal wicking strip that is adhered underneath the surface layer substantially at the opposite extremities only of the wicking strip and a lower substrate layer forming an envelope with said surface layer. A heat-fusible substance, which melts and flows above a pre-determined temperature, is applied on the surface of the wicking strip contiguous to at least one of the ends of the wicking member. When the heat-fusible substance is exposed to a temperature above the pre-determined temperature, the heat-fusible substance flows along the length of the wicking member.

Abstract: An apparatus for irreversibly indicating that the permissible temperature of stored products has been temporarily exceeded is described, in which a container has a heat-conducting connection to the product to be monitored and contains, in its interior, a medium having a melting point which is just above the permissible storage temperature, magnetizable particles being suspended in the medium. Moreover, solid magnetizable bodies are uniformly distributed in the container. After the deep-freezing process is complete, the magnetizable particles and the solid bodies are magnetized. If the permissible storage temperature is exceeded, the suspension becomes liquid and the pigments accumulate on the solid bodies, an optical indicator present on a wall of the container and visible from the outside detecting that the permissible temperature has been exceeded.

Abstract: A thawing indication marker for frozen food is disclosed for determining whether or not a frozen food has been thawed. It comprises a tube of an elastic transparent resin, the tube being bent at its center to form two separate containers. One container contains a colored gel-like liquid prepared from an edible starch and food color and the other container contains a gel-like liquid also prepared from an edible starch and food color which is different from the first food color. The marker is used by straightening the bent portion and applying it to frozen food. If the food undergoes thawing, as a result of being subjected to a temperature above the freezing point of water, the gels become less viscous and can intermingle. By virtue of the color difference, one can observe whether or not any intermingling of the two different colored gels has occurred and therefore, whether or not the food stuff has been subjected to non-thawing conditions.

Abstract: A pop-up thermometer having an elongate housing formed with a longitudinally extending bore, a plurality of internal neck regions, and a plurality of internal cavities. The neck regions each having a minimum diameter portion and a neck locking surface extending outwardly from the minimum diameter portion of the neck. An indicator rod slidably disposed in the bore of the housing includes at least one stem stretch having a diameter less than the remainder of the bore and a stem locking surface extending outwardly from said stem stretch. A fusible material fills the internal cavities. When the fusible material is in solid form, the neck locking surface exerts a substantially downward directed force on said stem locking surface on the rod to resist upward movement of the rod relative to the housing.

Abstract: A timer for poultry and other products comprises a barrel having a closed end and an open end surrounded by an external flange. Within the barrel is a stem which is spring-based upwardly but held in the barrel by an alloy or organic material which releases the stem at a pre-determined cooking temperature. In the past there has been a tendency for the stem to move upwardly ("creep") before the pre-determined cooking temperature is reached. The present invention applies an adhesive to the top of the external barrel flange and the bottom of a flange on the upper end of the stem to prevent creep and also to obstruct entry of juices into the barrel. Alternatively an accelerator for said adhesive is applied to said external barrel flange to shorten the time for curing said adhesive.

Abstract: A method and a device for monitoring the handling conditions of at least one object intended to be handled under certain predetermined conditions. The temperature or the temperature as a function of time of at least one object, is monitored to enable it to retain as much as possible of its original quality. To this end, a device is inserted into the object, or between two objects in a stack of objects, including a substantially flat, elongate casing, having a slot-shaped space between two opposed walls of the casing. An elongate slide-shaped body removably inserts into the slot-shaped space of the casting. At one end the slide-shaped body is provided with a technique for indicating, by color change, the exceeding and the falling-short of the predetermined conditions. The color change is thereafter observed visually by withdrawing the slide-shaped body removably inserted in the slot-shaped space of the casing.

Abstract: A composition of matter suitable for use in a reversible thermometer is disclosed which comprises a thermally responsive material capable of being supercooled at least for several minutes, and subject to a change in state from a solid to a liquid substantially at a predetermined temperature; means for visually observing the change in state; and a matrix forming material comprising an amorphous organic compound, the matrix forming material being insoluble in the thermally responsive material; whereby the thermally responsive material is dispersed within the matrix forming material, the composition of matter being reversibly responsive to changes in temperature, and remaining in the liquid state for a time sufficient to permit a user of the composition to observe the change in state. The preferred matrix forming material is polyisobutylene, and the preferred thermally responsive material is a solid solution of ortho-chloronitrobenzene and ortho-bromonitrobenzene.

Abstract: A pop-up thermometer having an elongate housing formed with a longitudinally extending bore, first and second internal neck regions, a first internal cavity and a second internal cavity. An indicator rod slidably disposed in the cavity includes a front end portion, a first stem stretch extending from the front end portion and terminating in a raised portion, a second stem stretch extending from the raised portion and a rear end portion spaced from the front end portion. The front end portion and the first stem stretch are positioned in the first internal cavity while the second stem stretch is positioned in the second internal cavity. The first stem stretch has a lesser cross sectional diameter than the front end portion of the rod. A fusible material substantially fills the first internal cavity, engaging the front end portion and at least a portion of the first stem stretch to retain the indicator rod in the housing.

Abstract: A temperature-time-pressure detecting device for a closed heat treatment zone consists of a sealed discoidal-shaped capsule of substantially transparent material adapted for placement within the zone in a generally vertical position. The capsule is formed of two opposed preferably symmetrical circular shell walls sealed around their common rim and defining therebetween a central core region containing a shaped mass of a fusible indicating material having a defined melting point at least as high as the temperature to be detected. The central core region is surrounded by an inner and an outer annular chamber which are concentric with the core region and with one another.

Abstract: A temperature indicator utilizing waxes, low-temperature melt metals or polymers attached to a support member that will melt to reveal a visible indicia on the support member thereby serving as an indicator that the product container to which the invention is attached has been heated beyond a predetermined stable temperature of the product.

Abstract: For measuring and controlling the temperature of a splice portion between two optical fiber (1, 1') ends, during the splicing process when the material of the ends is heated to be fusioned, the time-dependency of the surface tension effect for viscous liquids is utilized. Then the fiber (1, 1') ends are placed for splicing with a relatively large lateral offset in the retainers (39) of a fiber splicer and are spliced by the heat of an electric arc generated between the welding electrodes (43). The heating of the fiber ends is continued, whereby the offset of the fiber ends will gradually decrease due to the surface tension. The offset is then measured at different times during the continued heating and from these determined values and the times when they were measured the temperature of the heated fiber end portions is determined. This temperature value may then be compared to a predetermined set value for control of the heating of the splice region.

Abstract: A remote sterilization indicator is described. The indicator allows a sterilization cycle to be monitored without the need to visually inspect the indicator.

Abstract: A temperature indicating container apparatus includes an inner container portion made from substantially heat insulative material. A thermochromic-substance-containing portion is juxtaposed against an outside surface of the inner container portion, such that color changes of the thermochromic-substance-containing portion can be seen from outside the inner container portion. The thermochromic-substance-containing portion may be in a form of a jacket around the outside surface of the inner container portion. The jacket may include a plurality of windows. An outermost container portion may be located outside both the thermochromic-substance-containing jacket and the inner container portion. The outermost container portion is light transmissive such that color changes of the thermochromic-substance-containing jacket can be seen from outside the outermost container portion. A bridge element bridges top portions of the inner container portion and the outermost container portion.

Abstract: A time-temperature indicator label for measuring the length of time to which a product has been exposed to a temperature above a pre-determined temperature is provided. The period of time of exposure is integrated with the temperature to which the indicator is exposed. The label is a composite of a plurality of layers adapted to be adhered at its underside to a product container. The label includes a printable surface layer, a longitudinal wicking strip that is adhered underneath the surface layer substantially at the opposite extremities only of the wicking strip and a lower substrate layer forming an envelope with said surface layer. A heat-fusible substance, which melts and flows above a pre-determined temperature, is applied on the surface of the wicking strip contiguous to at least one of the ends of the wicking member. When the heat-fusible substance is exposed to a temperature above the pre-determined temperature, the heat fusible substance flows along the length of the wicking member.

Abstract: A time-temperature monitor is provided that is adapted for indicating the amount of accumulated time during which the ambient temperature adjacent to the monitor is above a predetermined temperature. The time-temperature monitor comprises a viscous, non-Newtonian fluid biased within a flow path defining element, with the rate of flow therethrough being regulated by a constricting orifice disposed in a nozzle that is positioned in fluid communication with the flow path defining element.

Abstract: A low cost, disposable temperature sensor comprising a non-porous rigid substrate having a colored patch of a contrasting color, covered by a thermochromic material which obscures the colored patch. The thermochromic material, which has a color in the visual range which completely obscures the underlying colored patch, is selected to have a melting or solidus point such that when the material is exposed to a predetermined temperature, the thermochromic material permanently changes to a relatively transparent color whereby the colored patch on the substrate is rendered visible through the thermochromic material. A transparent cover or film encapsulates the thermochromic material place on the substrate. In a preferred embodiment of the invention, the substrate comprises a paperboard product, and includes printed indicia for making a permanent record.

Abstract: A high resolution thermometer operated by the pressure of a solid/liquid se mixture is characterized by a vessel containing the mixture, a pressure sensor and a pressure indicator. A relatively small change in the temperature to be measured causes the proportion of solid and liquid in the vessel to change, thereby producing a dramatic change in pressure which can be measured with greater accuracy than the relatively small temperature change. Temperature is determined by converting the pressure to temperature using the appropriate thermodynamic relationship.

Abstract: A device for indicating a time-temperature thermal history of a refrigerated product over a specific temperature range. The device includes a container having a high-viscosity fluid therein, the fluid remaining in either a liquid or gaseous state over the entire specific temperature range. A mobile portion moves within the fluid as a result of a return force of an elastic component. The displacement of the mobile portion indicates the time-temperature thermal history of the product over the specific temperature range.

Abstract: A wafer is used in a device for the selective connecting and disconnecting of plastic tubes. The wafer is in the form of a heated plate having an outwardly extending scoop on each side thereof. The wafer also includes a generally straight line horizontal slit extending through the plate from the trailing downstream edge inwardly. In order to assure single use usage of the wafer, an aperture is provided through the wafer with the aperture being covered by a sensing material. A sensor in the device will inactivate the device if the sensing material is not detected.

Abstract: A maximum temperature indicator comprises a body of inexpensive and highly durable polymeric material adapted to be affixed to a support, such as within a mechanical device. The polymeric material undergoes a detectable physical change unique to a maximum temperature to which the polymeric material was exposed. After exposure, the polymeric material is easily tested to accurately determine the maximum temperature that the sample was exposed to.

Abstract: An apparatus for checking deep-frozen food, which irreversibly indicates if an additional storage temperature has been exceeded, is described. A flat plastic bag having transparent walls, into which eutectic mixture having a liquid/solid phase transition in the range from 0.degree. to -50.degree. C. has been introduced, together with a magnetic dispersion consisting of finely divided magnetic pigments, has a heat-conducting connection to the material to be frozen. A magnetic stripe which contains a magnetically recorded pattern and which remains connected to the bag until the indicating apparatus together with the material to be frozen has been cooled below the limiting temperature is stuck to the bag. The magnetic stripe is then removed. If the permissible limiting temperature is exceeded, the optically or magnetically readable structure produced by the magnetic stripe in the indicator bag is eliminated, permitting easy checking of the deep-frozen food.

Abstract: A temperature indicator including a barrel and shaft wherein the shaft has a number of integrally formed, longitudinally spaced seals which engage the internal bore of the barrel in order to keep the bore of the barrel sealed from any incursion of cooking juices into the barrel and from the outflow of any melted temperature sensitive material.

Abstract: A surface mount overheat indicator device includes a flattened annular outer frame and an inner fusible disk positioned within the outer frame. The fusible disk is formed of a material which melts at a selected temperature. The outer frame has a plurality of adhesive relief apertures formed therethrough in circumferentially spaced relation. The fusible disk projects rearwardly of a rear surface of the outer frame to define an adhesive receiving space between the rear surface of the outer frame and a surface on which the device is adhesively installed. The adhesive receiving space and the adhesive relief apertures cooperate to prevent the positioning of a layer of adhesive or a pocket of air between the fusible disk and the surface on which the device is installed to avoid interfering with the transfer of heat therefrom.

Abstract: A package for adapting a chemical thermometer to axillary use comprising a substrate coated with a release agent, a clinical chemical thermometer disposed on the substrate and a transparent overlayer film having a surface of the film coated with a pressure sensitive adhesive, the adhesive coated surface being in juxtaposition with the oral thermometer and the release agent coated surface of the substrate, thereby, adhering the thermometer to the overlayer film and sealing the thermometer within the package formed by the substrate and the overlayer film, the overlayer film being releasably adhered to the substrate.

Abstract: An apparatus is provided for indicating if the temperature of a fluid within a machine has surpassed a critical temperature. An integrally formed support of a rigid material able to withstand the critical temperature includes a head and a cavity formed within the head. The head provides a hexagonal nut such that a standard socket wrench or other wrench may be used to engage and rotationally drive the head of the device. An engagement shaft extends from the head and provides an external machine screw thread that enables engagement of the shaft within a complimentary threaded hole in the machine. The shaft further includes an axial bore that extends from a distal end of the shaft, through the shaft, and terminates adjacent to the cavity within the head. A temperature indicator is made of a material having a melting temperature equal to the critical temperature and is bonded within the cavity such that the support means and the indicator means are in good thermal contact.

Abstract: An improved steam sterilization process monitor is disclosed comprising a backing strip, a wicking means in intimate contact with an organic compound mounted on the backing strip and a water vapor rate controlling cover strip. In the preferred embodiment the backing strip comprises aluminum foil having a polypropylene interlayer adhesively bonded thereto. The sole means for bonding the cover strip to the backing strip is by heat sealing. The cover layer is heat sealed to the backing strip over the entire land area of the backing strip surrounding the wicking means, but is not heat sealed to the wicking means. The organic compound has a normal melting point in the absence of water vapor of about 5.degree. to about 50.degree. F. above a predetermined control temperature.

Abstract: In the heat-sensitive indicator herein disclosed, a colored heat-fusible substance 3 is accommodated in an inner hollow portion of a projection 1 which is formed from a film collapsible by application of an external pressure such as a finger-pressure. The opening of the hollow portion is sealed with a thin cover 9 collapsible through the application of the foregoing pressure. An An absorber 7 in which the colored heat-fusible substance 3 in the molten state can permeate is arranged outside the thin cover 9 of the hollow portion. The colored heat-fusible substance 3 is supported by a carrier 5 and accommodated in the interior of the hollow portion of the projection 1. A space in which the carrier is dropped when the thin cover 9 is broken through the application of a pressure is formed, behind the thin cover 9, by a hollow ring 11.

Abstract: A check sample of a deep-frozen product or a product is provided, whose keeping, conserving or preserving temperature, which is below ambient temperature, must be controlled or checked. The sample includes a case or envelope, which is sealed in an inviolable manner and, in the case or envelope, a meltable object having a predetermined shape different from the internal shape of the case. This object has a melting point below or equal to the thawing or keeping temperature of the product and the initial shape of the object is impossible to reconstitute following thawing or reheating, even of a partial nature, of the product. According to the invention, the case comprises a first part made invisible and integral with the product or a pack containing the latter by insertion into the pack or the case a second part, which is visible and integral with the first part.

Abstract: An indicator used for monitoring whether or not a cooled or deep-frozen product has exceeded a preset critical temperature. The indicator includes a hollow shape which is symmetrically divided by separating walls. This structure allows the indicator fluids to be placed on a circular radius within the hollow shape. This design also exhibits a special centrifugal axis. This axis allows the fact that the products have reached the critical temperature to be disclosed in the following manner: the indicator fluids melt and move away from their resting place in the hollow shape. If the fluids are re-frozen, they can not return to their prior resting place because the fluids arrived at that original resting place due to centrifugation. Thus, departure from the fluids' centrifuged state gives notice that the products have reached their critical temperature.