Multi-layer glass sheet

Claim 1

MULTI-LAYER GLASS SHEET COMPRISING TWO GLASS PLATES AND, INTERPOSED BETWEEN SAID PLATES, AN INTERMEDIATE LAYER, SAID INTERMEDIATE LAYER BEING SUBSTANTIALLY TRANSPARENT AND, ON INCREASE IN TEMPERATURE, BECOMING THERMOREVERSIBLY OPAQUE AT A PREDETERMINED TEMPERATURE, SAID INTERMEDIATE LAYER BEING SOLID CONTAINING A LIQUID PRODUCING COMPONENT THEREIN AND COMPRISING, AS THERMOREVERSIBLE COMPONENT, AN ADSORPTION COMPOUND OF A POLYMERIZATION PRODUCT AND A COMPOUND ADSORBED BY SAID POLYMERIATION PRODUCT, SAID POLYMERIZATION PRODUCT AND SAID ADSORABLE COMPOUND BEING COMPOSED SO AS TO FORM SAID ABSORPTION COMPOUND, SAID ADSORPTION COMPOUND BEING OPTICALLY HOMOGENEOUS AND SUBSTANTIALLY TRANSPERENT BELOW SAID PREDETERMINED TEMPERATURE AND, ON INCREASE IN TEMPERATURE, BEING REVERSIBLY SPLIT UP INTO ITS COMPONENTS THEREBY FORMING AN OPTICALLY HETEROGENEOUS MIXTURE OF SAID COMPONENTS RESULTING IN AN OPAQUE APPEARANCE OF SAID INTERMEDIATE LAYER, SAID INTERMEDIATE LAYER BEING ENCLOSED BETWEEN SAID GLASS PLATES TO SUBSTANTIALLY PREVENT EVAPORATION OF SAID ADSORDABLE COMPOUND.