ELECTRICALLY HEATED MULTIPLE GLAZED WINDOW HAVING AN IRIDESCENCE MASKING FILM

• US 3,710,074 A
• Filed: 10/08/1970
• Issued: 01/09/1973
• Est. Priority Date: 10/08/1970
• Status: Expired due to Term

• Current Assignee: John L. Stewart
• Original Assignee: John L. Stewart
• Inventors: Stewart, John L.
• Primary Examiner(s): Staubly, R. F.
• Application Number:
  US05/079,076
• Time in Patent Office: 824 Days
• Field of Search: 219/203,543 52/171,202,203 350/1
• US Class Current: 219/203
• CPC Class Codes: B32B 17/10055 with at least one intermediate air space
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: E06B 3/6715 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 Class Codes: H05B 3/84 Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A multiple glazed window unit having an electro-conductive coating and bus bars on the enclosed space surface of one of its glass panels is used to reduce condensation, drafts, and room heat loss adjacent to the window when the outside temperature is below that inside. A selective reflecting film on the enclosed space surface of one of the panels improves the heat insulating character of the unit and reduces visible iridescence common to electroconductive films. The selective reflecting film has an absolute infrared reflectance of at least 0.7 and sufficient visible light reflectance for the substantial elimination of visible iridescence.

Claims

1. A multiple glazed window unit for separating a thermally controlled space from an environment comprising two transparent panels disposed in parallel relation to one another, designated as a first panel for facing said controlled space and a second panel for facing said environment, spacing means marginally disposed between the panels separating one from another and sealing means disposed around the panel edges forming a hermetically sealed enclosed space therebetween, a transparent electroconductive coating on the enclosed space surface of said first panel and electrical source means connected thereto and a transparent, light and heat reflecting coating having an absolute infrared reflectance of at least 0.7 on the enclosed space surface of said second panel, said light and heat reflecting coating having sufficient visible light reflectance to substantially eliminate apparent iridescence observable from said electroconductive coating.

2. The multiple glazed window unit of claim 1 wherein said electroconductive coating comprises a transparent metal oxide film and said transparent light and heat reflecting coating has an emissivity less than 0.9 overall and less than about 0.6 for wavelengths between 800 millimicron units and 2250 millimicron units.

3. The multiple glazed window unit of claim 1 wherein said electroconductive coating comprises a transparent metal oxide film and said transparent light and heat reflecting coating comprises a metallic coating selected from a group consisting of platinum, palladium, copper, chrome, nickel, gold, aluminum, titanium and silver.

4. The multiple glazed window unit of claim 3 wherein said electroconductive coating comprises tin oxide and said transparent light and heat reflecting coating comprises copper.

5. The multiple glazed window unit of claim 4 wherein the panels are glass.

6. A building having a wall opening in which is mounted a window unit comprising two transparent panels disposed in parallel relation to one another, spacing means marginally disposed between said panels spacing them apart from one another, sealing means disposed around the edges of said panels forming a hermetically sealed enclosed space therebetween, a transparent electroconductive coating disposed on the enclosed space surface of the panel adjacent the building interior and electrical source means connected thereto and a mEtallic, transparent, light and heat reflecting coating having an absolute infrared reflectance of at least 0.7 and sufficient visible light reflectance to mask the iridescence of said electroconductive coating disposed on the enclosed space surface of the panel facing the exterior of the building.