Patent ID: 9234382
Filing Date: 2016-01-12
CPC Classification: B32B,C03C,E06B

Claim Text:
1. An insulating double glazing unit for use in a building, consisting essentially of, in the order listed: a first glass sheet, having a face exterior to the unit and a face interior to the unit; a soft low-emissivity assembly of layers produced by cathodic sputtering comprising an infrared-reflecting metal layer on the interior face of the first glass sheet; a closed space; a second glass sheet, having a face exterior to the unit and a face interior to the unit; and a hard metal oxide layer deposited by gas pyrolysis on the exterior face of the second glass sheet; wherein the exterior face of the first glass sheet is a glass surface of the first glass sheet and the interior face of the second glass sheet is a glass surface of the second glass sheet, wherein a roughness Ra of the surface of the hard metal oxide layer is less than 10 nm and the roughness is obtained by polishing, and a light transmission of the insulating double glazing unit is not less than 60% for a unit wherein each of the first and second glass sheets is 4 mm in thickness of clear glass, wherein the metal oxide layer comprises a layer of tin oxide doped with antimony or fluorine and has a thickness of not less than 200 nm, and wherein a haze value of the unit is less than 0.3%.