Appliance with coated transparency

Abstract

An appliance transparency, such as an oven transparency, includes at least one substrate and a coating deposited over at least a portion of the substrate. The coating includes at least one metal layer, such as a metallic silver layer. The metal layer can have a thickness in the range of 80 Å to 100 Å and optionally or the coating can have a protective coating deposited thereon.

What is claimed is:  
     
         1 . An appliance transparency, comprising: 
 at least one substrate;    a first coating deposited over at least a portion of the at least one substrate, the first coating comprising at least one metallic layer having a thickness in the range of 80 Å to 100 Å and/or a protective coating; and    a second coating comprising at least one metallic layer having a thickness in the range of 80 Å to 100 Å and/or a protective coating.    
     
     
         2 . The transparency of  claim 1 , further comprising at least one dielectric layer.  
     
     
         3 . The transparency of  claim 1 , wherein at least one of the metallic layers includes at least one metal selected from the group consisting of gold, copper, silver, aluminum, or mixtures, alloys, or combinations thereof.  
     
     
         4 . The transparency of  claim 2 , wherein the at least one dielectric layer includes at least one material selected from metal oxides, oxides of metal alloys, doped metal oxides, nitrides, oxynitrides, and mixtures thereof.  
     
     
         5 . The transparency of  claim 4 , wherein the at least one dielectric layer includes at least one metal oxide selected from oxides of zinc, titanium, hafnium, zirconium, niobium, bismuth, indium, tin, and mixtures thereof.  
     
     
         6 . The transparency of  claim 2 , wherein the at least one dielectric layer comprises a plurality of dielectric films.  
     
     
         7 . The transparency of  claim 1 , wherein the first coating comprises: 
 a first dielectric layer;    a first metallic layer deposited over the first dielectric layer;    a second dielectric layer deposited over the first metallic layer;    a second metallic layer deposited over the second dielectric layer;    a third dielectric layer deposited over the second metallic layer film; and    a third metallic layer deposited over the third dielectric layer.    
     
     
         8 . The transparency of  claim 7 , wherein the first dielectric layer has a thickness in the range of 300 Å to 350 Å.  
     
     
         9 . The transparency of  claim 7 , wherein the first dielectric layer comprises a zinc oxide film deposited over a zinc stannate film.  
     
     
         10 . The transparency of  claim 9 , wherein the zinc oxide film has a thickness in the range of 50 Å to 200 Å, for example 50 Å to 150 Å.  
     
     
         11 . The transparency of  claim 9 , wherein the zinc stannate film has a thickness in the range of 150 Å to 500 Å.  
     
     
         12 . The transparency of  claim 7 , wherein the first metallic layer has a thickness in the range of 80 Å to 90 Å.  
     
     
         13 . The transparency of  claim 7 , wherein the second dielectric layer comprises a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film.  
     
     
         14 . The transparency coating of  claim 13 , wherein the first zinc oxide film has a thickness in the range of 50 Å to 150 Å, the zinc stannate film has a thickness in the range of 200 Å to 500 Å, and the second zinc oxide film has a thickness in the range of 50 Å to 150 Å.  
     
     
         15 . The transparency of  claim 7 , wherein the second metallic layer has a thickness in the range of 80 Å to 90 Å.  
     
     
         16 . The transparency of  claim 7 , wherein the third dielectric layer comprises a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film.  
     
     
         17 . The transparency coating of  claim 16 , wherein the zinc oxide films each have a thickness in the range of 50 Å to 150 Å.  
     
     
         18 . The transparency of  claim 16 , wherein the zinc stannate film has a thickness in the range of 200 Å to 800 Å.  
     
     
         19 . The transparency of  claim 7 , wherein the third metallic layer has a thickness in the range of 50 Å to 100 Å.  
     
     
         20 . The transparency of  claim 7 , including a fourth dielectric layer deposited over the third metallic layer.  
     
     
         21 . The transparency of  claim 20 , wherein the fourth dielectric layer comprises a zinc stannate film deposited over a zinc oxide film.  
     
     
         22 . The transparency of  claim 21 , further comprising a protective layer deposited over the fourth dielectric layer.  
     
     
         23 . The transparency of  claim 21 , wherein the zinc stannate film has a thickness in the range of 50 Å to 200 Å.  
     
     
         24 . The transparency of  claim 21 , wherein the zinc oxide film has a thickness in the range of 50 Å to 150 Å.  
     
     
         25 . The transparency of  claim 7 , wherein the third metallic layer is a protective layer.  
     
     
         26 . The transparency of  claim 1 , wherein the first coating comprises at least one coating unit comprising a first zinc stannate layer, a metallic layer formed over the zinc stannate layer, and a second zinc stannate layer formed over the metallic layer.  
     
     
         27 . The transparency of  claim 26 , wherein the zinc stannate layers have thicknesses in the range of 300 Å to 400 Å.  
     
     
         28 . The transparency of  claim 26 , wherein the metallic layer of the first coating has a thickness in the range of 80 Å to 90 Å.  
     
     
         29 . The transparency of  claim 1 , wherein both the first and second coatings include a protective coating.  
     
     
         30 . The transparency of  claim 29 , wherein the protective coating comprises at least one metal oxide selected from titanium oxide, aluminum oxide, silicon oxide, and mixtures thereof.  
     
     
         31 . The transparency of  claim 30 , wherein the protective coating has a thickness in the range of 100 Å to 10 microns.  
     
     
         32 . An oven transparency, comprising: 
 a first panel defining a No. 1 and a No. 2 surface;    a second panel spaced from the first panel and defining a No. 3 and a No. 4 surface;    a third panel spaced from the second panel and defining a No. 5 and a No. 6 surface;    a first coating deposited over at least a portion of the No. 3 surface, the first coating comprising at least one metallic layer having a thickness in the range of 80 Å to 100 Å; and    a second coating deposited over at least a portion of the No. 5 and/or No. 6 surfaces and comprising at least one metallic layer having a thickness in the range of 80 Å to 100 Å.    
     
     
         33 . The transparency of  claim 33 , wherein a protective coating is deposited over at least a portion of at least one of the first and second coatings.  
     
     
         34 . The transparency of  claim 33 , wherein the second coating is deposited over both No. 5 and/or No. 6 surfaces.  
     
     
         35 . The transparency of  claim 32 , wherein the first and second coatings are deposited by physical vapor deposition.  
     
     
         36 . An oven transparency, comprising: 
 at least one composite panel comprising a first glass sheet contacting a second glass sheet.    
     
     
         37 . The transparency of  claim 36 , wherein the first glass sheet defines an inner surface and an outer surface, with a first coating deposited over at least a portion of the inner surface, 
 wherein the second glass sheet defines an inner surface and an outer surface, with a second coating deposited over at least a portion of the outer surface, and    wherein the outer surface of the first sheet abuts the inner surface of the second sheet.    
     
     
         38 . The transparency of  claim 37 , wherein at least one of the first and second coatings is deposited by physical vapor deposition.  
     
     
         39 . The transparency of  claim 37 , wherein at least one of the first and second coatings includes a metal layer.  
     
     
         40 . A microwave oven transparency, comprising: 
 a first panel;    a coating deposited over at least a portion of the first panel, the coating comprising at least one metallic layer; and    a polymeric layer located adjacent the coating.    
     
     
         41 . The transparency of  claim 40 , wherein the polymeric layer comprises a polymeric sheet.  
     
     
         42 . The transparency of  claim 40 , wherein the coating includes a protective coating.  
     
     
         43 . The transparency of  claim 40 , wherein the coating further comprises a first metal oxide layer and a second metal oxide layer, with the metallic layer located between the first and second metal oxide layers.  
     
     
         44 . The transparency of  claim 40 , further including a second panel spaced from the first panel.  
     
     
         45 . An oven door, comprising: 
 a first pane spaced from a second pane,    wherein at least one pane includes a first coating having at least one metallic layer, the first coating having an emissivity of less than or equal to 0.15 at 21° C.    
     
     
         46 . The oven door as claimed in  claim 45 , including a second coating formed of at least a portion of at least one of the panes.  
     
     
         47 . The oven door as claimed in  claim 45 , wherein the first coating includes one or more metallic silver layers.  
     
     
         48 . The oven door as claimed in  claim 45 , wherein the first coating includes at least three metallic silver layers.  
     
     
         49 . The oven door as claimed in  claim 45 , wherein the second coating has an emissivity of less than 0.3 at 21° C.  
     
     
         50 . A self-cleaning oven door, comprising: 
 a first pane;    a second pane spaced from the first pane;    a third pane spaced from the second pane; and    at least one coating containing at least one metallic layer formed over at least a portion of at least one of the panes,    wherein the door is free of air vents.