Oven door

Patent metadata

Field	Value
Publication number	US-9377204-B2
Application number	US-201314386443-A
Country	US
Kind code	B2
Filing date	Mar 19, 2013
Priority date	Mar 20, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A domestic oven door includes an inner glass sheet intended to be the glass sheet closest to the compartment of the oven, and an outer glass sheet, the glass sheets being held rigidly connected and being separated by an air gap, the inner glass sheet possessing a chemical composition which includes the following constituents, in an amount by weight within the limits defined hereinafter:

SiO 2
55-70%

Al 2 O 3
12-25%

B 2 O 3
 0-0.5%

Li 2 O
 0-2%

Na 2 O + K 2 O
 0-5%

MgO
 0-10%

CaO
 0-15%

SrO
 0-15%

BaO
 0-15%

ZnO
 0-5%

RO
 5-25%

where RO = MgO + CaO + SrO + BaO + ZnO

TiO 2
 0-3%

ZrO 2
 0-4%.

First claim

The invention claimed is:

1. A domestic oven door comprising an inner glass sheet intended to be the glass sheet closest to a compartment of said oven, and an outer glass sheet, said inner and outer glass sheets being held rigidly connected and being separated by at least one air gap, said inner glass sheet possessing a chemical composition which comprises the following constituents, in an amount by weight within the limits defined hereinafter:

SiO 2
55-70%

Al 2 O 3
12-25%

B 2 O 3
 0-0.5%

Li 2 O
 0-2%

Na 2 O + K 2 O
 0-5%

MgO
 0-10%

CaO
 0-15%

SrO
 0-15%

BaO
 0-15%

ZnO
 0-5%

RO
 5-25%

where RO = MgO + CaO + SrO + BaO + ZnO

TiO 2
 0-3%

ZrO 2
 0-4%.

2. The oven door as claimed in claim 1 , comprising at least one intermediate glass sheet located between the inner glass sheet and the outer glass sheet, and separated from each of the latter by at least one air gap.

3. The oven door as claimed in claim 1 , a thickness of the inner and outer glass sheets being within a range from 2 to 5 mm.

4. The oven door as claimed in claim 1 , wherein at least the inner glass sheet is thermally toughened.

5. The oven door as claimed in claim 1 , the outer glass sheet and, optionally, the or each intermediate glass sheet being made of soda-lime-silica glass.

6. The oven door as claimed in claim 1 , at least one glass sheet being coated with a low-emissivity layer.

7. The oven door as claimed in claim 1 , the glass forming the inner glass sheet possessing a lower annealing temperature of at least 580° C. and not more than 750° C.

8. The oven door as claimed in claim 1 , the chemical composition of the inner glass sheet comprising an Li 2 O content of not more than 0.5%.

9. The oven door as claimed in claim 8 , the inner glass sheet possessing a chemical composition which comprises the following constituents, in an amount by weight within the limits defined hereinafter:

MgO
5-10%

CaO
0-5%

SrO + BaO + ZnO
0-15%.

10. The oven door as claimed in claim 8 , the inner glass sheet possessing a chemical composition which comprises the following constituents, in an amount by weight within the limits defined hereinafter:

MgO
0-7%

CaO
5-15%

SrO + BaO + ZnO
0-10%.

11. The oven door as claimed in claim 1 , the chemical composition of the inner glass sheet comprising an Li 2 O content of between 0.5% and 1.8%.

12. The oven door as claimed in claim 11 , the inner glass sheet possessing a chemical composition which comprises the following constituents, in an amount by weight within the limits defined hereinafter:

MgO
5-10%

CaO
0-7%

SrO + BaO + ZnO
0-6%.

13. The oven door as claimed in claim 8 , the inner glass sheet possessing a chemical composition which comprises the following constituents, in an amount by weight within the limits defined hereinafter:

MgO
1-6%

CaO
0-5%

SrO + BaO + ZnO
5-20%.

14. The oven door as claimed in claim 1 , the chemical composition of the inner glass sheet comprising an SrO+BaO+ZnO content of at least 3%.

15. A domestic electric pyrolytic oven, comprising a compartment and an oven door as claimed in claim 1 , the inner glass sheet being the glass sheet closest to said compartment.

16. The oven door as claimed in claim 1 , wherein the amount by weight of Na 2 O+K 2 O is 0-1%.

17. The oven door as claimed in claim 6 , wherein the at least one glass shee

Assignees

• Eurokera

Inventors

• Plevacova Kamila
• Brunet Edouard
• Dargaud Olivier

Classifications

• C03C3/085 Primary

  containing an oxide of a divalent metal · CPC title

• F24C15/04 Primary

  with transparent panels · CPC title

• F24C15/006

  Arrangements for circulation of cooling air · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• F24C15/02

  Doors specially adapted for stoves or ranges · CPC title