Patent ID: 7650721

Claim:
A window for absorbing sunlight heat in warm weather that otherwise would flow uncontrolled therethrough and discharging the sunlight heat to the atmosphere while permitting relatively unobstructed vision therethrough and passing the sunlight heat in cold weather therethrough for thermal warming, said window comprising: a) a frame; b) an inner pane; c) an outer pane; and d) a heat sink; wherein said inner pane is pivotally mounted to said frame; wherein said outer pane is affixed to said frame; wherein said outer pane is spaced from said inner pane so as to form a space therebetween; wherein said heat sink is rotatably mounted to said frame; wherein said heat sink has an extended position in which said heat sink occupies coextensively said space for absorbing the sunlight heat in the warm weather that otherwise would flow uncontrolled therethrough and discharging the sunlight heat to the atmosphere while permitting relatively unobstructed vision therethrough; wherein said heat sink has a retracted position in which said heat sink does not occupy coextensively said space for passing the sunlight heat in the cold weather therethrough for thermal warming; wherein said heat sink comprises a solar-energy conversion screen; wherein said solar-energy conversion screen of said heat sink is made of a thin, pliable, dark, fiberglass fabric mesh; and wherein said solar-energy conversion screen of said heat sink is interchangeable with a foiled-faced heat-reflecting shade or an insulated shade for enhancing the R value of said window; wherein said frame has: a) a head jamb with an upper telescoping air-tight vent; and b) a foot jamb with a lower telescoping air-tight vent.