Multiple-pane window comprising a fluid filter curtain

Claim 1

A window comprising a rectangular frame constituted by two vertical uprights and two horizontal cross-members consisting respectively of a top cross-member and a bottom cross-member and at least two flat, smooth and parallel window panes secured to said frame along their edges, said frame and said two window panes being so arranged as to define a leak-tight space, and further comprising: a bottom reservoir housed within said bottom cross-member and adapted to receive a first fluid, a first distribution chamber housed within said bottom cross-member and adapted to extend along the entire length of those edges of the window panes which are in contact with the bottom cross-member, said first distribution chamber being adapted to communicate with said leak-tight space through a plurality of ducts disposed in uniformly spaced relation along the entire length, a lift and force pump associated with control means and having an inlet which opens into said bottom reservoir and an outlet which opens into said first distribution chamber, said pump being placed within said bottom cross-member, a controllable discharge valve placed within said bottom cross-member and capable of establishing a communication between said bottom reservoir and said first distribution chamber, a top reservoir housed within said top cross-member and provided with means for establishing a communication with that portion of said leak-tight space which is located in the vicinity of said top cross-member and capable of receiving a second fluid, the density of the first fluid being higher than that of the second fluid, the two fluids being such as to have different optical indices, each cross-member and each upright is provided on the internal face directed towards the window panes with a lip, said lip having a thick portion in the vicinity of the upright or of the cross-member and a portion of reduced thickness extending between said window panes, the edge of each of the two window panes being clamped between one face of said portion of reduced thickness and an external packing-piece, said two packing-pieces being each secured by clamping against one of the two faces of the upright or of the cross-member which is parallel to said window panes, the ducts extending through said lip and seals and being interposed between the faces of the portion of reduced thickness and the window panes and between the packing-pieces and said panes.