Patent ID: 7192647
Filing Date: 2007-03-20
Classification: C03C,C23C,Y10T

Abstract:
1. A substrate bearing a low-emissivity coating comprising, in sequence outwardly: a) a dielectric inner coat; b) a first infrared-reflective layer comprising material that is highly reflective of solar radiation; c) a concentration-modulated middle coat including a first graded film region having a substantially continuously decreasing concentration of a first dielectric material and a substantially continuously increasing concentration of a second dielectric material, wherein the first and second dielectric materials are different materials having refractive indexes that are substantially the same such that the first graded film region transitions from one dielectric material having a given refractive index to another dielectric material having substantially the same refractive index; d) a second infrared-reflective layer comprising material that is highly reflective of solar radiation; and e) a dielectric outer coat; wherein each infrared-reflective layer is substantially pure silver having discrete inner and outer interfaces with underlying and overlying films.