Thermally insulated window system

Claim 1

An insulated window system, for use in windows or doors, completely sealable by insulated panel members comprising: an insulated frame section comprising a plurality of thermal break panel members, each panel member comprising a pair of spaced channel-shaped sections having inwardly extending flanges along both sides thereof, facing each other, a rigid plastic sheet of serrated cross-section situate between said channels and contacting the inner surface of each of said channels, said plastic sheet having means thereon to contact the flanges of both of said channels to bind the channels together and seal the spacing therebetween to provide a closed shell, and foamed-in-place, expanded, closed-cell foamed polymeric material filling and monolithically sealing said shell to form the panel member; a double-pane window mounted within a first portion of the insulated frame section; shutter sections attached adjacent the inner surface of the double-pane window movable from a first position completely covering the windowpanes to a second position exposing at least a portion of the windowpanes; and sealable vent means mounted in a second portion of the insulated frame section such that the window and vent occupy the area of said insulated frame section.