# US 5,051,560 A · Heated second window in a double glazing system

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- Number: US 5,051,560 A
- Document ID: US5051560A
- Status: Granted
- Kind: A
- Application number: 07/497,676
- Filed: 1990-03-23
- Granted: 1991-09-24
- Earliest claimed: 1989-03-23
- Assignees: Saint-Gobain Vitrage International; Acome
- Inventors: Jacques Fremaux; Roland Brechot
- Web page: https://patentgrep.com/patent/US5051560A

## CPC

- E06B 7/02: for providing ventilation, e.g. through double windows; Arrangement of ventilation roses (airflow control members per se F24F13/08)
- E06B 2007/026: {with air flow between panes}
- 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)

## Abstract

A window of a double glazing system includes a window frame formed in a wall of a room, a sash fitted in the window frame and an outer glazing mounted in the sash, all of which are conventional. A second glazing is mounted to the sash and at an interior position relative to the outer glazing, so as to form an air circulation space between the second and outer glazings. The second glazing is heated by a transparent electrical resistance layer formed thereon and apertures are formed in the sash to create an air circulation path from the outside, through the air circulation space into the room. As a result, fresh air circulating into the room is heated by the heated second glazing.

## Claims

### Claim 1

A window comprising:
a window frame in a wall of a room;
a sash fitted in said window frame;
an outer glazing mounted in said sash;
a second glazing mounted to one of said frame, said sash and said outer glazing, and at position interior to said outer glazing, so as to form an air circulation space between said second and outer glazings;
means for heating said second glazing; and
apertures in at least said sash and positioned for forming an air circulation path from outside said outer glazing, through said air circulation space and into the room,
wherein said apertures comprise at least one lower aperture in a bottom crosspiece of said sash and at least one upper aperture in a top crosspiece of said sash, and
wherein said at least one lower aperture comprises a single aperture extending substantially the width of the outer glazing and connecting said air circulation space with the outside,
whereby fresh air circulating into the room is heated by said heating means.

### Claim 2 (depends on 1)

The window of claim 1 wherein said heating means comprise a heating electrical resistor on a surface of said second glazing.

### Claim 3 (depends on 2)

The window of claim 2 wherein said electrical resistor comprises a transparent layer.

### Claim 4 (depends on 3)

The window of claim 3 wherein said transparent layer comprises a semiconductive metal oxide.

### Claim 5 (depends on 3)

The window of claim 3 wherein said transparent layer is formed on a surface of said second glazing facing said outer glazing.

### Claim 6 (depends on 3)

The window of claim 3 wherein said transparent consists of at least one layer formed of materials of the group consisting of pyrolized powders of tin oxide doped with fluoride and indium oxide doped with tin.

### Claim 7 (depends on 3)

The window of claim 3 wherein said transparent layer comprises a plurality of sub-layers formed of a vacuum sputtered conductive metal layer sandwiched between transparent dielectric layers.

### Claim 8 (depends on 1)

The window of claim 1 wherein said second glazing comprises a frame section air-tightly mounted to said sash and a glazing element fitted in said frame section.

### Claim 9 (depends on 8)

The window of claim 8 wherein frame section is mounted to said sash via a hinge and a latch.