Multiple cavity low-emissivity coatings
First Claim
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1. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outwardly:
- a) a first transparent dielectric film region;
b) a first infrared-reflection film region;
c) a second transparent dielectric film region;
d) a second infrared-reflection film region;
e) a third transparent dielectric film region;
f) a third infrared-reflection film region;
g) a fourth transparent dielectric film region;
wherein the coating has a metal/dielectric ratio of at least 0.22, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions.
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Abstract
The invention provides multiple cavity low-emissivity coatings. The coating includes three infrared-reflection film regions, which may each comprise silver.
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Citations
35 Claims
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1. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outwardly:
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a) a first transparent dielectric film region;
b) a first infrared-reflection film region;
c) a second transparent dielectric film region;
d) a second infrared-reflection film region;
e) a third transparent dielectric film region;
f) a third infrared-reflection film region;
g) a fourth transparent dielectric film region;
wherein the coating has a metal/dielectric ratio of at least 0.22, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outwardly:
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a) a first transparent dielectric film region;
b) a first infrared-reflection film region;
c) a second transparent dielectric film region;
d) a second infrared-reflection film region;
e) a third transparent dielectric film region;
f) a third infrared-reflection film region;
g) a fourth transparent dielectric film region;
wherein the coating has a metal/dielectric ratio of at least 0.25, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, wherein the transparent substrate is part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glazing unit, the insulating glazing unit having an exterior reflected color characterized by an ah color coordinate of between about +1.5 and about −
2 and a bh color coordinate of between about 0 and about −
3. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A transparent substrate having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outwardly:
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a) a first transparent dielectric film region;
b) a first infrared-reflection film region;
c) a second transparent dielectric film region;
d) a second infrared-reflection film region;
e) a third transparent dielectric film region;
f) a third infrared-reflection film region;
g) a fourth transparent dielectric film region;
wherein the coating has a metal/dielectric ratio of at least 0.25, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third infrared-reflection film regions divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, wherein the transparent substrate is part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glazing unit, the insulating glazing unit having a visible transmittance of 0.65 or more. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A glass pane having two generally opposed major surfaces, wherein a multiple cavity low-emissivity coating is provided on a desired one of the major surfaces, the coating comprising, in sequence from said desired major surface outwardly:
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a) a first transparent dielectric film region;
b) a first layer comprising silver;
c) a second transparent dielectric film region;
d) a second layer comprising silver;
e) a third transparent dielectric film region;
f) a third layer comprising silver;
g) a fourth transparent dielectric film region;
wherein the coating has a metal/dielectric ratio of at least 0.22, the metal/dielectric ratio being defined as the combined thickness of the first, second, and third layers comprising silver divided by the combined thickness of the first, second, third, and fourth transparent dielectric film regions, wherein the glass pane is part of a multiple-pane insulating glass unit that includes a second glass pane, wherein the insulating glass unit has at least one between-pane space, said desired major surface being exposed to a between-pane space of the insulating glass unit, the insulating glass unit having an exterior reflected color characterized by a chroma magnitude number of less than about 1.82. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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Specification