For filling the insulating glass panes with a heavy gas, one of the glass plates(40) which are to constitute the insulating glass pane is only partly joined to the other glass plate (42) before the assembling, particularly in that said one glass plate is bent so that a gaplike opening temporarily remains...http://www.google.de/patents/US5366574?utm_source=gb-gplus-sharePatent US5366574 - Process for assembling insulating glass panes which are filled with a gas other than air
