Patent ID: 6555378
Filing Date: 2003-04-29
Classification: E06B,G01M

Abstract:
An insulating glass pane comprising at least two spaced-apart glass plates, an edge joining strip extending along edges of the glass plates and joining the glass plates to each other, the glass plates and the edge joining strip defining an insulated cavity between the glass plates which is sealed from atmospheric air, a gas other than air filling the insulating cavity, and a sensor in the sealed insulating cavity continuously exposed to the gas therein, the sensor reacting to a change in constituents of the gas with respect to a constituent of atmospheric air and making the change in the constituents of the gas visible when the gas exceeds a predetermined threshold of the constituent of atmospheric air through at least one of a change in color, a change in shape, and a change in state between solid, liquid or gaseous states of at least a part of the sensor.