Glazing perimeter anticondensation coating technology

Patent metadata

Field	Value
Publication number	US-9810017-B2
Application number	US-201514969397-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 15, 2015
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The invention provides a glass pane that has a transparent electrically conductive coating on a surface of the glass pane, such that the glass pane has a coated surface. The coated surface has a central region and a perimeter region. The transparent electrically conductive coating has a higher electrical conductivity at the central region than it does at the perimeter region. In some embodiments, the coated glass pane is part of an IG unit. Also provided are methods of producing a coated glass pane having an anti-condensation perimeter region.

First claim

What is claimed is:

1. A glass pane having a transparent electrically conductive coating on a surface of the glass pane, such that the glass pane has a coated surface, the coated surface having a central region and a perimeter region, the transparent electrically conductive coating being present on both the central region and the perimeter region, the transparent electrically conductive coating having a higher electrical conductivity at the central region than it does at the perimeter region, such that the transparent electrically conductive coating has electrical conductivity at both the central region and the perimeter region but the electrical conductivity at the central region is higher than the electrical conductivity at the perimeter region, whereby the transparent electrically conductive coating is configured to mitigate condensation at the perimeter region.

2. The glass pane of claim 1 wherein the transparent electrically conductive coating comprises a transparent electrically conductive oxide film that is oxidized to a different extent at the central region than it is at the perimeter region.

3. The glass pane of claim 1 wherein the transparent electrically conductive coating comprises an indium tin oxide layer that is oxidized to a different extent at the central region than it is at the perimeter region.

4. The glass pane of claim 1 wherein the transparent electrically conductive coating has a sheet resistance that is at least 5 Ω/square higher at the perimeter region than it is at the central region.

5. The glass pane of claim 1 wherein the transparent electrically conductive coating has a visible transmission that is substantially the same at the perimeter region as it is at the central region.

6. The glass pane of claim 5 wherein the visible transmission at the perimeter region is no more than 2% different from the visible transmission at the central region.

7. The glass pane of claim 1 wherein the transparent electrically conductive coating has a thickness of less than 3,000 Å, the thickness of the transparent electrically conductive coating being substantially the same at the perimeter region as it is at the central region.

8. The glass pane of claim 1 wherein the transparent electrically conductive coating comprises an indium tin oxide film having a thickness of less than 1,800 Å.

9. The glass pane of claim 1 wherein the glass pane is annealed glass having a surface stress of less than 3,500 psi.

10. The glass pane of claim 1 wherein, at the central region, the transparent electrically conductive coating has a sheet resistance of less than 30 Ω/square in combination with the coated glass pane having a monolithic visible transmittance of greater than 0.82.

11. The glass pane of claim 10 wherein, at the central region, the sheet resistance of the transparent electrically conductive coating is less than 20 Ω/square in combination with the monolithic visible transmittance of the coated glass pane being greater than 0.86.

12. The glass pane of claim 11 wherein the transparent electrically conductive coating comprises an indium tin oxide film having a thickness of between 1,050 Å and 1,450 Å, and at the central region the sheet resistance of the transparent electrically conductive coating is less than 15 Ω/square in combination with the monolithic visible transmittance of the coated glass pane being between 0.86 and 0.92.

13. The glass pane of claim 1 wherein the perimeter region of the coated surface has a width that is greater than ⅛ inch but less than 8 inches.

14. The glass pane of claim 1 wherein the glass pane is mounted in a frame, the perimeter region of the coated surface being adjacent to the frame and surrounding the central region of the coated surface.

15. The glass pane of claim 1 wherein the glass pane is part of a multiple-pane insulating glass unit that comprises at least two glass panes and has at least one between-pane space, the multiple pane insulating glass unit having two external surfaces and a plurality of internal surfaces, each of the internal surfaces being exposed to a between-pane space of the multiple-pane insulating glass unit, each of the two external surfaces being exposed to an environment external to the multiple-pane insulating glass unit, the transparent electrically conductive coating being on one of the two external surfaces of the multiple-pane insulating glass unit.

16. The glass pane of claim 1 wherein the multiple-pane insulating glass unit is mounted to a window frame of a building, the window frame retaining the multiple-pane insulating glass unit in a vertical orientation such that the coated surface is exposed to a room-side environment inside the building.

17. The glass pane of claim 1 wherein the transparent electrically conductive coating has a thickness that is substantially the same at the perimeter region as it is at the central region.

18. The glass pane of claim 1 wherein the electrical conductivity of the transparent electrically conductive coating as averaged over an entirety of the central region is higher than the electrical conductivity of the transparent electrically conductive coating as averaged over an entirety of the perimeter region.

19. A multiple-pane insulating glass unit comprising at least two glass panes and having at least one between-pane space, the multiple pane insulating glass unit having two external surfaces and a plurality of internal surfaces, each of the internal surfaces being exposed to a between-pane space of the multiple-pane insulating glass unit, each of the two external surfaces being exposed to an environment external to the multiple-pane insulating glass unit, a desired one of the two external surfaces having a transparent electrically conductive coating so as to define a coated surface, the coated surface having a central region and a perimeter region, the transparent electrically conductive coating being present on both the central region and the perimeter region, the transparent electrically conductive coating having a higher electrical conductivity at the central region than it does at the perimeter region, such that the transparent electrically conductive coating has electrical conductivity at both the central region and the perimeter region but the electrical conductivity at the central region is higher than the electrical conductivity at the perimeter region, whereby the transparent electrically conductive coating is configured to mitigate condensation at the perimeter region.

20. The multiple-pane insulating glass unit of claim 19 wherein the transparent electrically conductive coating has a visible transmission that is substantially the same at the perimeter region as it is at the central region.

21. The multiple-pane insulating glass unit of claim 19 wherein the transparent electrically conductive coating has a thickness that is substantially the same at the perimeter region as it is at the central region.

22. The multiple-pane insulating glass unit of claim 19 wherein the electrical conductivity of the transparent electrically conductive coating as averaged over an entirety of the central region is higher than the electrical conductivity of the transparent electrically conductive coating as averaged over an entirety of the perimeter region.

23. A glazing comprising a frame and a multiple-pane insulating glass unit, the multiple-pane insulating glass unit being mounted to the frame, the multiple-pane insulating glass unit comprising an inboard glass pan

Assignees

• Cardinal Cg Co

Inventors

• Burrows Keith James

Classifications

• C03C2218/322

  Oxidation · CPC title

• C03C2218/32

  After-treatment · CPC title

• C03C17/3411

  with at least two coatings of inorganic materials (C03C17/36, C03C17/42 take precedence) · CPC title

• E06B3/6715

  specially adapted for increased thermal insulation or for controlled passage of light (E06B3/66323 takes precedence; coating of glass pains C03C17/00; devices or arrangements for controlling the intensity, colour, phase, polarisation or direction of light G02F1/00) · CPC title

• E06B7/12 Primary

  Measures preventing the formation of condensed water (double glazing E06B3/24 - E06B3/28 {and E06B3/677} ; heating arrangements specially adapted for transparent or reflecting areas H05B3/84) · CPC title