Low transmission low emissivity glass window and method of manufacture

• US 5,229,881 A
• Filed: 06/10/1992
• Issued: 07/20/1993
• Est. Priority Date: 06/10/1992
• Status: Expired due to Fees

• Current Assignee: Tempglass Eastern, Inc.
• Original Assignee: Tempglass Eastern, Inc.
• Inventors: House, Timothy, Day, James E., Buckley, Roger
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/896,325
• Time in Patent Office: 405 Days
• Field of Search: 359/359, 359/360, 359/585, 204/192.27, 428/432, 428/632
• US Class Current: 359/360
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• 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 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 5/285 comprising deposited thin solid films G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361
• CPC Class Codes: Y10T 428/12611 Oxide-containing component

Abstract

A low emissivity, low shading coefficient window consisting of two panes of glass. The first pane having a low wave infrared reflecting and a visible light and shortwave infrared absorbing section of coatings on its inside surface. A second pane spaced about one half inch from the inside surface of the first pane to protect the coatings on the first pane and to insulate the coating. The infrared reflecting section consists of six layers of metals and metal oxides with the stainless steel being used for the absorption of the visible light and shortwave. The first layer consists of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide. The second layer is of silver or sterling silver. The third layer is stainless steel. The fourth layer is a barrier metal consisting of aluminum titanium, zinc, tin, nickel, chrome or its alloy. The fifth layer is selected from the same group as the first layer. The sixth layer is of titanium oxide.

Claims

1. A low transmission low emissivity window comprising at least two panes of glass, wherein a first pane of said glass has a sputter deposited multilayer coating on its inside surface comprised of:

(a) a layer of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide,

(b) a layer of silver,

(c) a layer of stainless steel,

(d) a layer selected from the group consisting of aluminum, titanium, zinc, tin, nickel, chromium, or alloys thereof,

(e) a layer of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide,

(f) a layer of titanium oxide, and wherein,

said two panes of glass are separated from one another by a distance of about 1/8 inch to about 7/8 inch.

2. A low transmission low emissivity window comprising at least two panes of glass, wherein a first pane of said glass has a sputter deposited multilayer coating on its inside surface comprised of:

(a) a layer of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide,

(b) a layer of silver,

(c) a layer of stainless steel,

(d) a layer selected from the group consisting of aluminum, titanium, zinc, tin, nickel, chromium, or alloys thereof,

(e) a layer of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide,

(f) a layer of titanium oxide, and wherein,

said layer (a) is deposited at a thickness between about 400 to about 800 angstroms,

said layer (b) is deposited at a thickness between about 20 to about 800 angstroms,

said layer (c) is deposited at a thickness between about 50 to about 1000 angstroms,

said layer (d) is deposited at a thickness between about 20 to about 100 angstroms,

said layer (e) is deposited at a thickness between about 500 to about 1000 angstroms,

said layer (f) is deposited at a thickness between about 400 to about 800 angstroms.

3. The product according to claim 2 wherein,

said layer (a) is zinc oxide,

said layer (d) is titanium, and

said layer (e) is zinc oxide.

4. The product according to claim 3 wherein,

said two panes of glass are separated from one another by a distance of about 1/2 inch.

5. The product according to claim 3 wherein,

said two panes of glass are separated from one another by a distance of about 1/8 inch to about 7/8 inch.

6. The product according to claim 2 wherein,

said two panes of glass are separated from one another by a distance of about 1/8 inch.

7. The product according to claim 2 wherein,

said two panes of glass are separated from one another by a distance of about 1/8 inch to about 7/8 inch.

8. A method of making a low emissivity window comprising the steps of:

(a) sputtering a layer of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide, onto a glass substrate,

(b) sputtering on a layer of silver,

(c) sputtering on a layer of stainless steel,

(d) sputtering on a layer of selected from the group consisting of aluminum, titanium, zinc, tin, nickel, chromium, or alloys thereof,

(e) sputtering on a layer of a metal oxide selected from the group consisting of tin oxide, zinc oxide, or a combination of zinc and tin oxide,

(f) sputtering on a layer of titanium oxide, further characterized in that, said layer (a) is deposited at a thickness between about 400 to about 800 angstroms,

said layer (b) is deposited at a thickness between about 20 to about 800 angstroms,

said layer (c) is deposited at a thickness between about 50 to about 1000 angstroms,

said layer (d) is deposited at a thickness between about 20 to about 100 angstroms,

said layer (e) is deposited at a thickness between about 500 to about 1000 angstroms,

said layer (f) is deposited at a thickness between about 400 to about 800 angstroms.

9. The method of claim 8 further characterized in that,

said layer (a) is zinc oxide,

said layer (d) is titanium, and

said layer (e) is zinc oxide.