Patent ID: 7910229

Claim:
An insulating glass unit, comprising: a first pane defining a #1 surface and a #2 surface; at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and a coating formed over at least a portion of the #3 surface; wherein the coating comprises a first separation layer comprising a zinc oxide layer over a zinc stannate layer, wherein the zinc oxide layer has a thickness in the range of 75 Å to 150 Å; a first infrared reflective layer deposited over the first separation layer; a second separation layer comprising a first zinc oxide layer having a thickness in the range of 75 Å to 150 Å, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer having a thickness in the range of 75 Å to 150 Å deposited over the zinc stannate layer; a second infrared reflective layer deposited over the second separation layer; a third separation layer comprising a first zinc oxide layer having a thickness in the range of 75 Å to 150 Å, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer having a thickness in the range of 75 Å to 150 Å deposited over the zinc stannate layer; and a third infrared reflective layer deposited over the third separation layer; and wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36.