The present disclosure relates to a temperature warning indicator for a handheld lighter which warns the user that parts of the lighter may be too hot to touch without burning the user.

The present disclosure relates to a temperature warning indicator for a handheld lighter which warns the user that parts of the lighter may be too hot to touch without burning the user.

The present invention relates to a responsive photonic coating and to a substrate provided with such a responsive photonic coating. The present invention also relates to a sensor. An object of the present invention is to provide a responsive photonic coating that can be used for simultaneously measuring the exposure to high temperature and steam, such as in an autoclave.

The present invention relates to a responsive photonic coating and to a substrate provided with such a responsive photonic coating. The present invention also relates to a sensor. An object of the present invention is to provide a responsive photonic coating that can be used for simultaneously measuring the exposure to high temperature and steam, such as in an autoclave.

The invention relates to a capsule comprising a shell containing a transparent and thermally conducting liquid, particles having a thermochromic coating and particles having a photochromic coating, the thermochromic particles being bulkier than photochromic particles, the liquid being such that, within a first range of temperatures, its density is greater than the density of the thermochromic particles and than the density of the photochromic particles, and such that, within a second range of temperatures greater than those of the first range, the density of the photochromic particles is less than the density of the liquid, which is itself less than the density of the thermochromic particles.

The invention relates to a capsule comprising a shell containing a transparent and thermally conducting liquid, particles having a thermochromic coating and particles having a photochromic coating, the thermochromic particles being bulkier than photochromic particles, the liquid being such that, within a first range of temperatures, its density is greater than the density of the thermochromic particles and than the density of the photochromic particles, and such that, within a second range of temperatures greater than those of the first range, the density of the photochromic particles is less than the density of the liquid, which is itself less than the density of the thermochromic particles.

Provided is an electric oven in which, when a surface temperature of an opening or closing door reaches a set temperature while a body heats food with the opening or closing door closed, an alarm design visible with the naked eyes is displayed on a front surface of the opening or closing door by an alarm display portion so as to prevent burns or accidents caused by negligence of a user.

A thermochromic polymeric nanocomposite includes layered double hydroxides (LDHs) and an embedded organic polymer. The thermochromic polymeric nanocomposite exhibits thermochromic activity, e.g., changes in color in response to a change in higher temperatures. The higher temperatures can range from 100° C.-150° C. or higher. As such, the thermochromic polymeric nanocomposite can be used to monitor temperature changes for materials approaching very high temperatures.

Novel reaction media for electron donating and electron accepting components in colour-change compositions are described. The compound is of formula (VI); R.sub.1, and R.sub.2 are independently selected from an optionally substituted linear or branched alkyl group, alkenyl group, alkoxy group, aryl group and an alkylene aryl group having from 5 to 22 carbon atoms; X.sub.1 and X.sub.2 are independently selected from —OC(O)—, —CO.sub.2— and O; Y.sub.1, and Y.sub.2 are independently selected from hydrogen, halogen, R.sub.1, —OR.sub.1; y is independently 0 or 1; and suitably the groups R.sub.1X.sub.1— and —X.sub.2R.sub.2 are independently in the ortho or meta position. The compounds are useful in ink compositions, writing implements containing the compound and medical and industrial applications in which temperature sensitive colour change may be required. ##STR00001##

Novel reaction media for electron donating and electron accepting components in colour-change compositions are described. The compound is of formula (VI); R.sub.1, and R.sub.2 are independently selected from an optionally substituted linear or branched alkyl group, alkenyl group, alkoxy group, aryl group and an alkylene aryl group having from 5 to 22 carbon atoms; X.sub.1 and X.sub.2 are independently selected from —OC(O)—, —CO.sub.2— and O; Y.sub.1, and Y.sub.2 are independently selected from hydrogen, halogen, R.sub.1, —OR.sub.1; y is independently 0 or 1; and suitably the groups R.sub.1X.sub.1— and —X.sub.2R.sub.2 are independently in the ortho or meta position. The compounds are useful in ink compositions, writing implements containing the compound and medical and industrial applications in which temperature sensitive colour change may be required. ##STR00001##