Frame for spacing glass panes

Claim 1

A spacing frame for use in forming an insulated arrangement of spaced glass panes so that the frame in combination with the glass panes forms a closed space, comprising a continuous length of a tubular bar having a continuous hollow interior region containing a granular hygroscopic material, said tubular bar including a first wall section forming the inside border of said frame and defining the edges of the closed space, said first wall section having a passage extending in the length direction of said tubular bar for communicating between the closed space and the hollow interior region containing the hygroscopic material, a second wall section forming an outside border of said frame and a pair of side walls extending between said first and second wall sections, said side walls extending substantially integrally at the corners of said frame and forming frame corner sides which are substantially smooth, the inner surfaces of said first wall section, second wall section and side walls forming the hollow interior region, said tubular bar being bent to form said corners, the corners of the spacing frame each comprise a plurality of narrow cuts with opposite parallel surfaces formed in said first wall section and formed between said cuts, said cuts having a depth approximately equal to the thickness of said first wall section so that said cuts open into the hollow interior region and a width in the length direction of said tubular bar equal to or less than the size of the granular hygroscopic material so that the material does not flow through said cuts.