Heated windows having vacuum-deposited layers

• US 4,010,304 A
• Filed: 07/24/1975
• Issued: 03/01/1977
• Est. Priority Date: 07/26/1974
• Status: Expired due to Term

• Current Assignee: Saint-Gobain Isover (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Isover (Compagnie De Saint-Gobain)
• Inventors: Cohen, Sabatino
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Thibodeau, P. J.
• Application Number:
  US05/598,740
• Time in Patent Office: 586 Days
• Field of Search: 428/34, 428/432, 428/469, 428/472, 428/213, 428/457, 156/99, 156/109, 156/107, 52/171, 296/84, 219/203
• US Class Current: 428/213
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2307/204 Di-electric
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2311/04 Gold
• CPC Class Codes: B32B 2315/02 Ceramics
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 9/005 comprising one layer of ceramic material, e.g. porcelain, ceramic tile layered products with at least two ceramic layers composed mainly of ceramic B32B18/00
• CPC Class Codes: B32B 9/041 of metal
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• CPC Class Codes: C03C 17/3628 one layer at least containing a sulfide
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3649 made of metals other than silver
• CPC Class Codes: C03C 17/3655 the multilayer coating containing at least one conducting layer
• CPC Class Codes: C03C 17/3673 specially adapted for use in heating devices for rear window of vehicles
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 2203/016 Heaters using particular connecting means
• 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: H05B 3/86 : the heating conductors being embedded in the transparent or reflecting material H05B3/845 takes precedence
• CPC Class Codes: Y10T 428/2495 : Thickness [relative or absolute]

Abstract

A glass sheet is provided with a metallic layer and auxiliary dielectric layers, at least one of the auxiliary layers being formed of a deposit of a heavy metal tungsten or molybdenum trioxide. The metallic trioxide may form an anchoring layer, and is advantageously of an interference thickness. Particular procedures for forming electric terminals for supplying heating current to the metallic layer are described. Laminated glazings with an intercalary plastic layer over the metallic trioxide layer are described.

Claims

1. A glazing comprising a glass sheet coated with an auxiliary dielectric anchoring layer, a metallic layer in contact with the anchoring layer, and a second auxiliary dielectric layer in contact with the metallic layer, in which at least one of the dielectric layers is formed of a deposit of a trioxide of tungsten or molybdenum.

2. A glazing according to claim 1 in which the auxiliary anchoring layer is formed of a deposit of a trioxide of tungsten or molybdenum, trioxide and is of an interference thickness.

3. A glazing according to claim 2 in which the anchoring layer has a thickness that reduces the transmission through the glazing in the middle of the visible spectrum to values in the range of 77% to 87% of the initial transmission.

4. A glazing according to claim 1 in which said second auxiliary layer is formed of a trioxide of tungsten or molybdenum, said glazing including an intercalary plastic layer over said second auxiliary layer, the thickness of said second auxiliary layer being slightly greater than a thickness producing a maximal improvement in the transmission of light before placing said intercalary plastic layer thereover.

5. A glazing according to claim 4 in which the improvement in light transmission produced by said second auxiliary layer near the lower limit of the visible spectrum is less than said maximal improvement by an amount not exceeding 16%.

6. A glazing according to claim 1 including electrical contact areas for supplying heating power to said metallic layer, at least one of said auxiliary dielectric layers being interposed between said electrical contact areas and said metallic layer and being formed of a trioxide of tungsten or molybdenum.

7. A glazing according to claim 6 in which said metallic layer has a thickness reducing light transmission therethrough by approximately 12% to 20%.

8. A glazing according to claim 6 in which said electrical contact areas comprise a layer of a baked metallic frit on said glass sheet, and said auxiliary dielectric anchoring layer is a trioxide of tungsten or molybdenum, and is of interference thickness.

9. A glazing according to claim 6 in which said metallic layer is of silver.

10. A glazing according to claim 6 in which said metallic layer is essentially constituted of a deposit of gold.

11. A glazing according to claim 10 in which both of said auxiliary dielectric layers on opposite sides of the gold layer are of a trioxide of tungsten or molybdenum, and are of interference thickness.

12. A glazing according to claim 1 including an intercalary plastic layer over said second auxiliary layer, and having a light transmission greater than 75% and an electrical surface resistivity less than 15 ohms per square.