Abstract: Thermally responsive materials are provided having improved resolidification (recrystallization) characteristics. These thermally responsive materials are useful as temperature indicating compositions by undergoing change of state as precise and predetermined temperatures. Marked improvement in the rate of recrystallization of these thermally responsive substances is obtained by the addition thereto of so-called "nucleating agents" preferably supported on suitable support materials.

Abstract: A system operable to signal the attainment of a preselected time-temperature integral for monitoring the temperature history of a product utilizes a free-radical sensitive dye and a peroxide on a carrier.

Abstract: The phenomena of undercooling encountered with various heat responsive materials in passing from the liquid to solid phase is minimized by incorporation of a regenerative nucleating agent which is soluble to some degree in the heat responsive materials.

Abstract: A disposable type cooking thermometer having a reservoir for holding a fluid, an indicator means, and a capillary tube or channel connecting the reservoir with the indicator means. The reservoir is made from a material which shrinks from an initial size at ambient temperatures to some smaller size when exposed to cooking temperatures. As the reservoir progressively shrinks during cooking, fluid is expelled therefrom thru the capillary tube or channel and onto the indicator means to denote the degree of cooking achieved in the foodstuff in which the thermometer has been inserted.

Abstract: Novel polyamides are prepared by reacting a dicarboxylic acid with 1,4-cyclohexane-bis(.beta.-ethylamine). Unique properties are obtained where the dicarboxylic acid is 1,4-cyclohexane diacetic acid. The polymers of this invention are distinguished from the prior art in that they exhibit unexpectedly high melting points and crystallinity. Thence they are suitable for use in fibers as well as molding and other general polyamide applications.

Abstract: Temperature indicating compositions are provided for use in disposable thermometers comprising a heat-conductive carrier sheet having at least one but preferably a plurality of regions (cavities) thereon, each region containing a thermally responsive substance which undergoes a change in state at a precise and predetermined temperature different from any other region. The thermally responsive materials used herein as temperature indicating compositions are solid solutions comprised of two components which, inter alia, have linear temperature-composition liquidous curves. The change of state of the solid solution in each region is readily detectable visually by an indicator system which is intimately associated with the solid solution in said regions in order to permit rapid and accurate visual determination of the temperature of the test subject.

Abstract: The temperature history of a product is visually displayed as a color front on an indicator, the distance of front advancement being a function of the temperature time integral. The indicator measures the gas generation in a first compartment by a wick in a second compartment, the wick also being in communication with the first compartment. Optionally, a gas permeable film separates the gas generating material and the wick.

Abstract: A system operable to signal the attainment of one or more preselected time-temperature integrals which monitor the temperature history of a product utilizes an organic compound which is subject to solvolysis with the generation of an acid, at least one base in an amount less than the stoichiometric equivalent of the acid generated, and a pH sensitive indicator.

Abstract: A package for the complete and protective enclosure of an article is described in which the article is fully enclosed by a continuous surface of rigid or semi-rigid material so as to form a housing. The housing is banded by a section of sufficiently reduced wall thickness to permit the frangible separation of the housing into two segments which are then drawn apart with the enclosed article being engaged by one of the segments for withdrawal from the other segment. The article can be fully assembled or partially assembled while in the package and means are described in the latter instance for dispensing the fully assembled article automatically in the course of removing it from the package.

Abstract: Temperature time integrating indicator device in which a gas generating material located at one end of the device and activated at time of use of the device is absorbed by an indicating wick extending in the device in a direction away from the gas source, which wick changes color to denote a time-temperature integral and hence the temperature history of a product, there being a gas barrier means extending along the longitudinal sides of the wick for inhibiting gas transport to insure that substantially all gas absorbed by the wick makes first contact with the wick at the end nearest the gas source thus precluding first gas contact with the wick at more remote location with consequent erroneous temperature history indication.