Patent ID: 6059909
Filing Date: 2000-05-09
Classification: B32B,C03C,E06B,Y10T

Abstract:
In a method of making an insulating glass unit comprised of at least two sheets of glass sealed at their peripheral edges to each other thereby to define at least one insulating chamber therebetween, said method including the steps of spacing said glass sheets apart, heating said sheets at an elevated temperature, and sealing the peripheral edges of said sheets to each other at or above said elevated temperature, the improvement comprising using as at least one of said glass sheets, a glass sheet having on a surface thereof and extending outwardly therefrom, a layer system including:a) a layer of a transparent dielectric material having an index of refraction (n) of about 2.5-2.6 as measured at a wavelength of 550 nanometers;b) a layer of Si.sub.3 N.sub.4 ;c) a layer of nichrome;d) a layer of silver;e) a layer of nichrome; andf) a layer of Si.sub.3 N.sub.4, and whereinwhen said glass sheet has a thickness of about 2 mm-6 mm and wherein said layers are of sufficient thicknesses such that said coated glass sheet has a normal emissivity (E.sub.n) of about 0.06 or less, a hemispherical emissivity (E.sub.h) of about 0.07 or less, a sheet resistance (R.sub.s) of about 5.0 ohms/sq. or less and having a substantially neutral visible reflected color when viewed from the glass side.