# US 12,120,786 B2 · Anti-frost glazing having heating power differentiated over the entire surface there-of

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- Number: US 12,120,786 B2
- Document ID: US12120786B2
- Status: Granted
- Kind: B2
- Application number: 17/277,606
- Filed: 2019-09-23
- Published: 2022-02-03
- Granted: 2024-10-15
- Earliest claimed: 2018-09-28
- Assignees: Saint-Gobain Glass France
- Applicants: Saint-Gobain Glass France
- Inventors: Thomas Tondu
- Web page: https://patentgrep.com/patent/US12120786B2

## CPC

- H05B 3/84: Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
- B64D 15/14: controlled cyclically along length of surface
- H05B 2203/037: Heaters with zones of different power density
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT

## Abstract

An anti-icing glazing or portion thereof, is entirely located, in the fitted position, on one side of the plane of symmetry of the body of an airborne, water-borne or terrestrial vehicle, wherein the heating power is differentiated over the whole of the surface thereof, so as to apply the maximum power to the portion of the surface where the heat loss is maximum.

## Claims

### Claim 1

An anti-icing glazing or portion thereof, entirely located, in a fitted position, on one side of a plane of symmetry of a body of an airborne, water-borne or terrestrial vehicle, wherein a heating power is differentiated over the whole of a surface thereof, so as to apply a maximum power to the portion of the surface where a heat loss is maximum, wherein an envelope of the anti-icing glazing or portion thereof is defined by a quadrilateral ABCD, AB being a tangent to a middle of an upper post of the glazing or the portion thereof, BC a tangent to a middle of a rear post thereof, CD a tangent to a middle of a lower post thereof and DA a tangent to a middle of a front post thereof, optionally included in the plane of symmetry of the body of the vehicle, E and G being the middles of the segments DA, respectively BC, F being any point on the segment EG, wherein a mean specific heating power of a surface area delimited by the points CDEF is greater than (i) a mean specific heating power of a surface area delimited by the points ABGE and (ii) a mean specific heating power of a surface area delimited by the points CFG.

### Claim 2 (depends on 1)

The anti-icing glazing or portion thereof as claimed in claim 1, wherein said portion of the surface where the heat loss is maximum is a bottom portion of the glazing which is subjected to greater collection of water than the rest of the glazing.

### Claim 3 (depends on 1)

The anti-icing glazing or portion thereof as claimed in claim 1, wherein the mean specific heating powers of the surface area delimited by the points CDEF is 7±1 kW/m2, the mean specific heating power of the surface area delimited by the points ABGE is 4±1 kW/m2, and the mean specific heating power of the surface area delimited by the points CFG is 4±1 kW/m2.

### Claim 4 (depends on 1)

The anti-icing glazing or portion thereof as claimed in claim 1, wherein a differentiated heating power is obtained by a deposition of a transparent electrically conductive layer of heterogeneous thickness to adjust a power dissipated.

### Claim 5 (depends on 1)

The anti-icing glazing or portion thereof as claimed in claim 1, further comprising a transparent electrically conductive layer from which fine flow-separating lines have been removed by ablation, so as to help to control a distribution of differentiated heating power.

### Claim 6 (depends on 5)

The anti-icing glazing or portion thereof as claimed in claim 5, wherein the transparent electrically conductive layer comprises at least one transparent conductive oxide and/or at least one metal.

### Claim 7 (depends on 1)

The anti-icing glazing or portion thereof as claimed in claim 1, wherein the anti-icing glazing is a laminated glazing including a laminated structure, of which a face inside the laminated structure of the glass sheet of the laminated glazing which, in the fitted position, is in contact with the outside atmosphere, bears resistive electrically conductive elements.

### Claim 8 (depends on 1)

A method comprising utilizing an anti-icing glazing or portion thereof as claimed in claim 1 in an airborne, water-borne or terrestrial vehicle.

### Claim 9 (depends on 6)

The anti-icing glazing or portion thereof as claimed in claim 6, wherein the at least one transparent conductive oxide is tin-doped indium oxide (Indium Tin Oxide—ITO) or fluorine-doped tin oxide SnO2:F.

### Claim 10 (depends on 6)

The anti-icing glazing or portion thereof as claimed in claim 6, wherein the at least one metal is silver.

### Claim 11 (depends on 1)

The anti-icing glazing or portion thereof as claimed in claim 1, wherein a difference between the mean specific heating power of the surface area delimited by the points CDEF and each of the mean specific heating power of the surface area delimited by the points ABGE and the surface area delimited by the points CFG is up to 30%.