Liquid crystal temperature sensor and materials

Abstract From the Canadian patent

The present invention relates to liquid crystal temperature indicating compositions, preferably absent cholesteric liquid crystal material, and the containing of such compositions in volumes formed in a containment medium that tends to distort the liquid crystal structure when the temperature thereof is below a transition or clearing point temperature. The containment medium is water resistant e.g. insoluble in water, and, preferably has heat and optical stability e.g. does not brown or otherwise, discolor at relatively high temperatures, e.g. above 100°C. Plural liquid crystal materials having different transition temperatures may be mixed to form a liquid crystal material having a …