Window for attenuating RF and IR electromagnetic signals

• US 9,499,438 B2
• Filed: 02/28/2013
• Issued: 11/22/2016
• Est. Priority Date: 02/28/2013
• Status: Active Grant

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Mitchell, John M., Theios, Jason E., Veerasamy, Vijayen S.
• Primary Examiner(s): COLGAN, LAUREN ROBINSON
• Application Number:
  US13/779,879
• Publication Number:
  US 20140237917A1
• Time in Patent Office: 1,363 Days
• Field of Search: 428/426, 428/428, 428/432, 428/688, 428/689, 428/699, 428/701, 428/702, 428/433, 428/434
• US Class Current: 1/1
• CPC Class Codes: C03C 17/3411 with at least two coatings of inorganic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/3655 the multilayer coating containing at least one conducting layer
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3676 specially adapted for use as electromagnetic shield
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: C03C 2217/94 Transparent conductive oxide layers [TCO] being part of a multilayer coating
• CPC Class Codes: C03C 2217/948 Layers comprising indium tin oxide [ITO]
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate
• CPC Class Codes: E06B 5/18 against harmful radiation against heat E06B5/16
• CPC Class Codes: E06B 9/24 Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00

Abstract

Windows for attenuating radio frequency (RF) and infrared (IR) electromagnetic signals, so as to prevent or reduce such signals from emanating from secure facilities (e.g., government and/or military facilities). Example embodiments relate to a window including at least first and second glass substrates, at least first and second low-emissivity (low-E) coatings for blocking at least some IR and RF signals, and at least one transparent conductive oxide (TCO) inclusive coating for blocking at least some RF signals. The TCO inclusive coating may include a layer of or including indium-tin-oxide (ITO) located between at least first and second dielectric layers.

Claims

1. A window structure comprising:

first and second glass substrates that are laminated to each other via a polymer-based laminating layer so that no air gap is provided between the first and second glass substrates of the window structure;

a first low-E coating on a first major surface of the first glass substrate;

a second low-E coating on a first major surface of the second glass substrate, wherein the first and second low-E coatings face each other with no glass substrate therebetween;

wherein each of the first and second low-E coatings comprises at least two IR reflecting layers comprising silver that are spaced apart from one another via at least one dielectric layer;

a sputter-deposited RF blocking coating on a second major surface of the second glass substrate for facing an interior of a building in which the window structure is to be mounted, and wherein the RF blocking coating comprises a transparent conductive layer comprising indium-tin-oxide (ITO) that is located between first and second dielectric layers;

wherein the first low-E coating is edge deleted so that the first low-E coating is not present on the first major surface of the first glass substrate along an edge of the first glass substrate;

wherein the second low-E coating is edge deleted so that the second low-E coating is not present on the first major surface of the second glass substrate along an edge of the second glass substrate; and

wherein the RF blocking coating is not edge deleted, so that the RF blocking coating is present across the entire second major surface of the second glass substrate.

2. The window structure of claim 1, wherein the first and second glass substrates are rectangular in shape and wherein:

the first low-E coating is edge deleted so that the first low-E coating is not present on the first major surface of the first glass substrate along all four edges of the first glass substrate, and the second low-E coating is edge deleted so that the second low-E coating is not present on the first major surface of the second glass substrate along all four edges of the second glass substrate.

3. The window structure of claim 1, wherein the polymer based laminating layer comprises PVB.

4. The window structure of claim 1, further comprising a conductive window frame member in which the first and second substrates are mounted, and wherein the RF blocking coating is in electrical communication with the conductive window frame member.

5. The window structure of claim 4, wherein the RF blocking coating is in electrical communication with the conductive window frame member via a plurality of conductive spacers.

6. The window structure of claim 1, wherein a central area of the window structure has a visible transmission of at least about 30%.

7. The window structure of claim 1, wherein a central area of the window structure has a visible transmission of at least about 50%.

8. The window structure of claim 1, where the RF blocking coating further comprises a dielectric layer comprising silicon oxynitride, and wherein the layer comprising silicon oxynitride is located between the layer comprising ITO and the second glass substrate.

9. The window structure of claim 1, wherein the RF blocking coating further comprises first and second silicon inclusive dielectric layers, and wherein the layer comprising ITO is located between the first and second silicon inclusive dielectric layers.

10. The window structure of claim 1, wherein the RF blocking coating further comprises (a) a layer comprising silicon oxynitride and (b) a layer comprising silicon oxide and/or silicon nitride, and wherein the layer comprising ITO is located between and directly contacting the layer comprising silicon oxynitride and the layer comprising silicon oxide and/or silicon nitride.

11. The window structure of claim 1, wherein at least one of the first and second low-E coatings comprises at least three IR reflecting layers comprising silver.

12. The window structure of claim 1, wherein each of the first and second low-E coatings comprises at least three IR reflecting layers comprising silver.

13. A window structure comprising:

first and second glass substrates that are laminated to each other via a polymer-based laminating layer, wherein the polymer based laminating layer is provided across a viewing area of the window structure so that no air gap is provided between the first and second glass substrates;

a first low-E coating on a first major surface of the first glass substrate, so that the first low-E coating faces the second glass substrate with no glass substrate therebetween, and wherein the first low-E coating comprises at least two IR reflecting layers comprising silver that are spaced apart from one another via at least one dielectric layer;

a sputter-deposited RF blocking coating facing an interior of a building in which the window structure is mounted, and wherein the RF blocking coating comprises a transparent conductive oxide layer that is located between first and second dielectric layers;

wherein the first low-E coating is edge deleted so that the first low-E coating is not present on the first major surface of the first glass substrate along at least one edge of the first glass substrate; and

wherein the RF blocking coating is not edge deleted.

14. The window structure of claim 13, wherein the first and second glass substrates are rectangular in shape and wherein the first low-E coating is edge deleted so that the first low-E coating is not present on the first major surface of the first glass substrate along all four edges of the first glass substrate.

15. The window structure of claim 13, wherein the polymer based laminating layer comprises PVB.

16. The window structure of claim 13, further comprising a conductive window frame member in which the first and second substrates are mounted, and wherein the RF blocking coating is in electrical communication with the conductive window frame member.

17. The window structure of claim 16, wherein the RF blocking coating is in electrical communication with the conductive window frame member via a plurality of conductive spacers.

18. The window structure of claim 13, wherein a central area of the window structure has a visible transmission of at least about 30%.

19. The window structure of claim 13, where the transparent conductive oxide is ITO, and wherein the layer comprising ITO is located between and contacting a layer comprising silicon oxynitride and a silicon inclusive dielectric layer.

20. The window structure of claim 13, wherein the RF blocking coating is on a major surface of the second glass substrate.

21. The window structure of claim 13, further comprising a third glass substrate, and wherein the RF blocking coating is on a major surface of the third glass substrate.

22. The window structure of claim 21, wherein an air gap is provided between the third glass substrate and the second glass substrate, and wherein the second and third glass substrates are spaced apart from one another via at least one spacer.

23. The window structure of claim 13, further comprising third and fourth glass substrates that are laminated to each other via another polymer-based laminating layer, and wherein the third glass substrate is located between the fourth glass substrate and the second glass substrate, and wherein the RF blocking coating is on a major surface of the fourth glass substrate.

24. The window structure of claim 23, wherein the second and third glass substrates are spaced apart from one another via at least one spacer, and wherein an air gap is provided between the second and third glass substrates.

25. The window structure of claim 24, wherein argon gas is provided in the air gap.