# US 2014/0154434 A1 · Refrigerator door/window > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0154434 A1 - Document ID: US20140154434A1 - Status: Published application - Kind: A1 - Application number: 13/690,133 - Filed: 2012-11-30 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Guardian Industries Corp. - Applicants: Guardian Industries Corp. - Inventors: Jose NUNEZ-REGUEIRO; David D. MCLEAN - Web page: https://patentgrep.com/patent/US20140154434A1 ## CPC - A47F 3/0434: {Glass or transparent panels} - C03C 3/087: containing calcium oxide, e.g. common sheet or container glass - C03C 4/0092: {for glass with improved high visible transmittance, e.g. extra-clear glass} - C03C 17/3626: {one layer at least containing a nitride, oxynitride, boronitride or carbonitride} - C03C 17/3639: {Multilayers containing at least two functional metal layers} - C03C 17/3644: {the metal being silver} - C03C 17/3652: {the coating stack containing at least one sacrificial layer to protect the metal from oxidation} - C03C 17/366: {Low-emissivity or solar control coatings} - E06B 3/66: Units comprising two or more parallel glass or like panes permanently secured together {(reforming and uniting glass sheets by fusing C03B23/00; joining glass to glass or to other materials C03C27/00; laminated glass B32B17/10)} - 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)} - C03C 2217/231: In2O3/SnO2 - C03C 2217/734: comprising an alternation of high and low refractive indexes - C03C 2217/94: Transparent conductive oxide layers [TCO] being part of a multilayer coating - C03C 2217/948: Layers comprising indium tin oxide [ITO] - C03C 2218/365: Coating different sides of a glass substrate - Y10T 428/24942: including components having same physical characteristic in differing degree - Y10T 428/265: 1 mil or less - A47F: SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Refrigerator doors (which includes freezer doors) are provided for use in display areas where refrigerated merchandise (e.g., frozen or chilled food) is displayed. It is desired to increase energy efficiency of the doors and thus of the refrigerated display system, while at the same time reducing visible reflectance from the doors to make it easier for customers to see merchandise which is being displayed behind the transparent doors. Refrigerator doors according to certain example embodiments of this invention include one or more AR coatings, some of which may include a transparent conductive layer (e.g., ITO) so as to also function as a low-E coating. ## Claims ### Claim 1 A transparent refrigerator door/window comprising: at least first and second glass substrates of the refrigerator door, the refrigerator door being attached to a refrigerator housing a refrigerated environment; a sputter-deposited combination anti-reflective and low-E coating on an interior surface of the first glass substrate, so that the sputter-deposited coating is not exposed to the refrigerated environment adjacent the refrigerator door/window or a room environment adjacent the refrigerator door/window; wherein the sputter-deposited coating comprises a transparent conductive layer comprising indium-tin-oxide (ITO) that is located between at least a dielectric layer comprising silicon oxynitride and a dielectric layer comprising silicon oxide, and wherein the dielectric layer comprising silicon oxynitride is located between at least the first glass substrate and the transparent conductive layer comprising ITO. ### Claim 2 (depends on 1) The refrigerator door/window of claim 1, wherein a gap is provided between the first and second glass substrates. ### Claim 3 (depends on 2) The refrigerator door/window of claim 2, wherein the gap is filled with air and/or an inert gas. ### Claim 4 (depends on 2) The refrigerator door/window of claim 2, wherein a spacer seal is provided proximate an edge of the first and second glass substrates in order to couple the first and second glass substrates to one another and to provide the gap. ### Claim 5 (depends on 1) The refrigerator door/window of claim 1, wherein the refrigerator door/window has a visible transmission of at least about 50%. ### Claim 6 (depends on 1) The refrigerator door/window of claim 1, wherein the layer comprising silicon oxynitride is located between and directly contacting the first glass substrate and the transparent conductive layer comprising ITO. ### Claim 7 (depends on 1) The refrigerator door/window of claim 1, wherein the layer comprising silicon oxide directly contacts the transparent conductive layer comprising ITO. ### Claim 8 (depends on 1) The refrigerator door/window of claim 1, wherein the layer comprising silicon oxide is an outermost layer of the coating. ### Claim 9 (depends on 1) The refrigerator door/window of claim 1, wherein the coating consists essentially of the transparent conductive layer comprising indium-tin-oxide (ITO), the dielectric layer comprising silicon oxynitride, and the dielectric layer comprising silicon oxide. ### Claim 10 (depends on 1) The refrigerator door/window of claim 1, wherein the transparent conductive layer comprising indium-tin-oxide (ITO) has a refractive index (n) at least 0.1 higher than respective refractive indices of the dielectric layer comprising silicon oxynitride and the dielectric layer comprising silicon oxide. ### Claim 11 (depends on 1) The refrigerator door/window of claim 1, wherein the transparent conductive layer comprising indium-tin-oxide (ITO) has a refractive index (n) at least 0.15 higher than respective refractive indices of the dielectric layer comprising silicon oxynitride and the dielectric layer comprising silicon oxide. ### Claim 12 (depends on 1) The refrigerator door/window of claim 1, glass of the first and/or second glass substrates comprises the following ingredients at the following weight percentages: Ingredient wt. % SiO2 67-75% Na2O 10-20% CaO 5-15% total iron (expressed as Fe2O3) 0.001 to 0.1% % FeO 0 to 0.005. ### Claim 13 (depends on 1) The refrigerator door/window of claim 1, wherein the transparent conductive layer comprising ITO is from about 60-220 nm thick. ### Claim 14 (depends on 1) The refrigerator door/window of claim 1, wherein the transparent conductive layer comprising ITO is from about 90-130 nm thick. ### Claim 15 (depends on 1) The refrigerator door/window of claim 1, wherein the second glass substrate is to be located closer to a refrigerated environment adjacent the door/window than is the first glass substrate. ### Claim 16 (depends on 1) The refrigerator door/window of claim 1, wherein the second glass substrate is to be located farther from a refrigerated environment adjacent the door/window than is the first glass substrate. ### Claim 17 (depends on 1) The refrigerator door/window of claim 1, further comprising a third glass substrate, wherein the second glass substrate is located between at least the first and third glass substrates, and wherein another combination anti-reflective and low-E coating is located on an interior surface of the third glass substrate, wherein the another coating comprises a transparent conductive layer comprising indium-tin-oxide (ITO) that is located between at least a dielectric layer comprising silicon oxynitride and a dielectric layer comprising silicon oxide, and wherein the dielectric layer comprising silicon oxynitride is located between at least the third glass substrate and the transparent conductive layer comprising ITO of the another coating. ### Claim 18 (depends on 17) The refrigerator door/window of claim 17, wherein an anti-reflective locating is located on an interior surface of the second glass substrate. ### Claim 19 (depends on 1) The refrigerator door/window of claim 1, wherein a low-E coating, including at least one IR reflecting layer comprising silver located between at least first and second dielectric layers, is located on an interior surface of the second glass substrate. ### Claim 20 (depends on 1) The refrigerator door/window of claim 1, wherein the coating has a sheet resistance of less than or equal to about 30 ohms/square. ### Claim 21 A transparent refrigerator door/window comprising: at least first and second glass substrates of the refrigerator door, the refrigerator door being attached to a refrigerator housing a refrigerated environment; a sputter-deposited combination anti-reflective and low-E coating on an interior surface of the first glass substrate, so that the coating is not exposed to the refrigerated environment adjacent the refrigerator door/window or a room environment adjacent the refrigerator door/window; wherein the sputter-deposited coating comprises an IR reflecting transparent conductive oxide layer having a refractive index of from 1.8 to 2.0 that is located between at least a first dielectric layer having a refractive index of from 1.65 to 1.85 and a second dielectric layer having a refractive index of from 1.5 to 1.7, and wherein the first dielectric layer is located between at least the first glass substrate and the transparent conductive oxide layer; and wherein the transparent conductive oxide layer has a refractive index (n) at least 0.1 higher than respective refractive indices of the first and second dielectric layers. ### Claim 22 (depends on 21) The refrigerator door/window of claim 21, wherein a gap is provided between the first and second glass substrates, wherein the gap is filled with air and/or an inert gas. ### Claim 23 (depends on 21) The refrigerator door/window of claim 21, wherein the refrigerator door/window has a visible transmission of at least about 50%. ### Claim 24 (depends on 21) The refrigerator door/window of claim 21, wherein the first dielectric layer is located between and directly contacting the first glass substrate and the transparent conductive oxide layer. ### Claim 25 (depends on 21) The refrigerator door/window of claim 21, wherein the second dielectric layer directly contacts the transparent conductive oxide layer. ### Claim 26 (depends on 21) The refrigerator door/window of claim 21, wherein the transparent conductive oxide layer comprises ITO. ### Claim 27 (depends on 26) The refrigerator door/window of claim 26, wherein the transparent conductive oxide layer comprising ITO is from about 90-130 nm thick. ### Claim 28 A transparent refrigerator door/window comprising: a glass substrate of the refrigerator door, the refrigerator door being attached to a refrigerator housing a refrigerated environment; first and second coatings on opposite major surfaces of the glass substrate; wherein the first coating is an anti-reflection coating or a low-E coating; and wherein the second coating is a combination anti-reflective and low-E coating that comprises a transparent conductive layer comprising indium-tin-oxide (ITO) that is located between at least a dielectric layer comprising silicon oxynitride and a dielectric layer comprising silicon oxide, and wherein the dielectric layer comprising silicon oxynitride is located between at least the glass substrate and the transparent conductive layer comprising ITO. ### Claim 29 (depends on 28) The refrigerator door/window of claim 28, wherein the dielectric layer comprising silicon oxynitride and/or the dielectric layer comprising silicon oxide is doped with aluminum. ### Claim 30 (depends on 28) The refrigerator door/window of claim 28, wherein the dielectric layer comprising silicon oxide further comprises nitrogen.