Replaceable double glazed window defogging appliance and window structure therefor

In combination a pair of substantially parallel spaced apart panes of transparent sheet material;

• resilient gasket means disposed between the marginal edges of the facing surfaces of said panes;
• said gasket means having compressible faces engaging the adjacent faces to said spaced apart panes and defining an enclosed volume between the facing surfaces of said panes;
• a frame circumscribing the periphery of said panes said frame including elements having grooves for receiving the marginal edge of said panes to urge said panes toward one another to compress said gasket an amount sufficient to produce an air-tight sealing contact between the marginal edges of the facing surfaces of said panes and said gasket means;
• at least one of said frame elements having a receptacle, and a passage between said receptacle and the groove of said element;
• said gasket means having an aperture in registry with said passage and extending to said enclosed volume;
• a sealed detachable container having flexible walls fitted within said receptacle and carrying a quantity of dehydrating material a rigid tube extending outwardly from said flexible walls of said container and sealingly secured to said container walls;
• and a means for supporting said tube with respect to said container to facilitate its manipulation through said gasket aperture;
• said tube extending from said container through said passage and said gasket aperture to provide gas flow communication between the interior of said container and said enclosed volume;
• and passage means providing communication between ambient atmosphere and said receptacle within said frame for pumping gas between said container and said enclosed volume.