Multi-pane electrochromic windows
First Claim
1. A multi-pane electrochromic window comprising:
- a first pane comprising a first electrochromic device; and
a second pane comprising a second electrochromic device;
wherein each of the first and second electrochromic devices comprises;
i) a tungsten oxide or doped tungsten oxide electrochromic layer having a charge capacity of between about 30 and about 150 mC/cm2/micron; and
ii) a nickel tungsten oxide counter electrode, optionally doped with tantalum, having a charge capacity of between about 75 and about 200 mC/cm2/micron;
wherein the ratio of the electrochromic layer thickness to the counter electrode thickness is between about 1.7;
1 and about 2.3;
1 and each electrochromic device does not tint to less than 10% transmissivity.
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Accused Products
Abstract
Window units, for example insulating glass units (IGU'"'"'s), that have at least two panes, each pane having an electrochromic device thereon, are described. Two optical state devices on each pane of a dual-pane window unit provide window units having four optical states. Window units described allow the end user a greater choice of how much light is transmitted through the electrochromic window. Also, by using two or more window panes, each with its own electrochromic device, registered in a window unit, visual defects in any of the individual devices are negated by virtue of the extremely small likelihood that any of the visual defects will align perfectly and thus be observable to the user.
66 Citations
15 Claims
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1. A multi-pane electrochromic window comprising:
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a first pane comprising a first electrochromic device; and a second pane comprising a second electrochromic device; wherein each of the first and second electrochromic devices comprises; i) a tungsten oxide or doped tungsten oxide electrochromic layer having a charge capacity of between about 30 and about 150 mC/cm2/micron; and ii) a nickel tungsten oxide counter electrode, optionally doped with tantalum, having a charge capacity of between about 75 and about 200 mC/cm2/micron; wherein the ratio of the electrochromic layer thickness to the counter electrode thickness is between about 1.7;
1 and about 2.3;
1 and each electrochromic device does not tint to less than 10% transmissivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multi-pane electrochromic window comprising two or more electrochromic devices, each of the two or more electrochromic devices on a separate pane of the multi-pane electrochromic window, and each of the two or more electochromic devices being a two-state device having a high transmissivity state and a low transmissivity state, wherein the two or more electrochromic devices are configured to together employ, concurrently, their high transmissivity states or their low transmissivity states, wherein each of the two or more electrochromic devices comprises:
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i) a tungsten oxide or doped tungsten oxide electrochromic layer having a charge capacity of between about 30 and about 150 mC/cm2/micron; and ii) a nickel tungsten oxide counter electrode, optionally doped with tantalum, having a charge capacity of between about 75 and about 200 mC/cm2/micron; wherein the ratio of the electrochromic layer thickness to the counter electrode thickness is between about 1.7;
1 and about 2.3;
1 and each electrochromic device does not tint to less than 10% transmissivity. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification