Patent ID: 6014872
Filing Date: 2000-01-18
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 coated glass substrate having on a surface thereof a layer system including the following layers extending outwardly therefrom:a first layer of Si.sub.3 N.sub.4 ;a first layer of nickel or nichrome;a layer of silver;a second layer of nickel or nichrome; anda second layer of Si.sub.3 N.sub.4 ;wherein at least one of said Si.sub.3 N.sub.4 layers includes from about 0.5-15% by weight stainless steel, and whereinwhen said glass substrate has a thickness of about 2 mm-6 mm said coated glass substrate has a normal emissivity (E.sub.n) of about 0.06 or less, a hemispherical emissivity (E.sub.h) of about 0.08 or less, a sheet resistance (R.sub.s) of about 7.0 ohms/sq. or less and having a substantially neutral visible reflected color when viewed from the glass side.