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US 7,745,009 B2Granted
Low-emissivity glazing
AssigneeAgc Glass Europe
InventorsDaniel Decroupet, Jean-Michel Depauw
Life of this patent
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Abstract
Low emissivity glazing which is an assembly of thin layers including at least one metal layer reflecting infrared rays between one or more dielectric layers located between the metal layer and the glass sheet and on the metal layer, the light transmission of one clear float glass sheet 4 mm thick coated with said layers being not less than 83%, the metal layer being selected such that the emissivity is not higher than 0.042.
Claims31
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.
10 more elements
Dependencies are inferred from the claim text.