Patent ID: 7745009

Claim:
A low-emissivity glazing comprising: a glass sheet; and an assembly of layers coated on the glass sheet including: at least one metal layer that reflects infrared rays; a first sub-assembly of at least three dielectric layers located between the metal layer and the glass sheet, said first sub-assembly including: a first dielectric layer comprising zinc oxide and located immediately under the metal layer, a second dielectric layer comprising metal oxide, nitride, or oxynitride having a refractive index greater than 1.9, a third dielectric layer comprising metal oxide, nitride, or oxynitride having a refractive index greater than 1.9; and a second sub-assembly of layers on a side of the metal layer opposite the first sub-assembly of layers, said second sub-assembly including: a fourth dielectric layer, wherein, when the glass sheet is a clear float glass sheet with a thickness of 4 mm the low emissivity glazing has a visible light transmission at least equal to 83%, and wherein the emissivity of the coated glass sheet is not greater than 0.042.