Neutral, high visible, durable low-e glass coating system and insulating glass units made therefrom
AssigneeGuardian Industries Corp.
InventorsKlaus W. Hartig, Steve L. Larson, Philip J. Lingle
Life of this patent
Estimating the term…
Abstract
A sputter-coated layer system on a glass substrate particularly useful in insulating glass (IG) units, enables normal emissivity values (E.sub.n) of 0.06 or less, good durability and neutral color. The layer system includes an undercoat of a transparent dielectric having an index of refraction between 2.5-2.6 at a wavelength of 550 nanometers, two layers of Si.sub.3 N.sub.4, and two layers of nichrome sandwiching a layer of silver to achieve its unique low-E, neutral color, non-mirrorlike solar management properties. An optional overcoat of a transparent dielectric material having an index of refraction of 2 at a wavelength of 550 nanometers may be provided.
Claims28
A sputter-coated glass article comprised of a glass substrate having on a surface thereof, from the glass outwardly, a layer system including:
- a) a layer of a transparent dielectric material having an index of refraction (n) of about 2.5-2.6 as measured at a wavelength of 550 nanometers;
- b) a layer of Si.sub.3 N.sub.4 ;
- c) a layer of nichrome;
- d) a layer of silver;
- e) a layer of nichrome;
- and
- f) a layer of Si.sub.3 N.sub.4, and wherein
- when said glass substrate has a thickness of about 2 mm-6 mm, and wherein said layers are of sufficient thicknesses such that said coated glass substrate has a normal emissivity (E.sub.n) of about 0.06 or less, a hemispherical emissivity (E.sub.h) of about 0.07 or less, a sheet resistance (R.sub.s) of about 5.0 ohms/.sub.sq. or less and having a substantially neutral visible reflected color when viewed from the glass side.
Dependencies are inferred from the claim text.