Patent ID: 6514620
Filing Date: 2003-02-04
Classification: B32B,C03C,Y10T

Abstract:
In a glass article comprising at least two glass substrates in light transmitting communication with each other and having a sputter coated layer system on at least one of said substrates, which coated substrate is heat treated for tempering, the improvement comprising said glass article being matchable and wherein said sputter coated layer system comprises from the glass substrate on which it is coated, outwardly:a) a layer comprising silicon nitride; b) a layer comprising at least one of nickel or nickel alloy having a nickel content of at least about 10% by weight Ni; c) a substantially metallic layer comprising silver; d) a layer comprising at least one of nickel or a nickel alloy having a nickel content of at least about 10% by weight Ni; and e) a layer comprising silicon nitride; wherein said layer system has a visible transmittance at least 4% greater after being heat treated for the tempering of the substrate than before it was heat treated, and the glass substrate upon which the layer system is provided is thermally tempered; and wherein the relative thicknesses of said layers combine to result in said heat treated coated substrate which when viewed monolithically from the glass side of said coating has a &Dgr;E*ab less than 2.0 and a &Dgr;a* less than about 0.8.