Patent US4048978A successfully refreshed from Google Patents.
US4048978A
Expired / Lapsed
US
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Heat insulating screen
Assignee: Glaverbel Mecaniver SA
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Filing: 1975-04-21
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Granted: 1977-09-20
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Expires: 1995-04-21
Abstract
Abstract A heat insulating screen forming a part of an oven or furnace comprising two or more sheets of glass of vitrocrystalline material mounted in facing relationship, one sheet providing one exterior face of the screen having been subjected to a chemical tempering treatment, the other sheet providing the other exterior face of the screen having improved thermal properties which are obtained either by utilizing a borosilicate glass which has a coefficient of thermal expansion of less than 5 x 10 -6 /° C or a sheet bearing at least one coating capable of screening off a significant amount of incident infrared radiation.
Inventors
- 👤 Emile Plumat
- 👤 Pol Baudin
- 👤 Robert Posset
- 👤 Jean-Marie Autequitte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:27
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/02; F24C15/04; C; C03; C03C; C03C17/00; C03C17/06; C03C17/22; C03C17/225; C03C17/23; C03C17/25; C03C21/00; F23; F23M; F23M11/00; F23M11/04; F23M11/042; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/211; C03C2217/213; C03C2217/215; C03C2217/23; C03C2217/24; C03C2217/25; C03C2217/251; C03C2217/28; C03C2217/281; C03C2217/282; C03C2217/287; C03C2217/288; C03C2218/00; C03C2218/10; C03C2218/11; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
130 words
In an oven or furnace, the combination with a wall thereof having an opening therein of a heat insulating screen mounted in said opening, said heat insulating screen comprising two transparent sheets of glass or vitrocrystalline material disposed in facing relation to each other, the sheet which is directed toward the outside of the oven or furnace being chemically tempered, and the sheet which is directed toward the inside of the oven or furnace bearing an infrared screening coating wherein said infrared screening coating comprises an oxide or a mixture of oxides, at least one oxide selected from the group consisting of tin oxide and indium oxide, said coated sheet having a low energy transmission and a high energy reflection in the wavelength range of from about 0.8- 15 microns.
Claim 2
Dependent Claim
130 words
In an oven or furnace, the combination with a wall thereof having an opening therein of a heat insulating screen mounted in said opening, said heat insulating screen comprising two transparent sheets of glass or vitrocrystalline material disposed in facing relation to each other, the sheet which is directed toward the outside of the oven or furnace being chemically tempered, and the sheet which is directed toward the inside of the oven or furnace bearing an infrared screening coating wherein said infrared screening coating comprises an oxide or a mixture of oxides, at least one oxide selected from the group consisting of tin oxide and indium oxide, said coated sheet having a low energy transmission and a high energy reflection in the wavelength range of from about 0.8- 15 microns.
Claim 3
Dependent Claim
15 words
The combination as recited in claim 1 wherein said oxide coating contains a doping agent.
Claim 4
Dependent Claim
29 words
The combination as recited in claim 2 wherein said infrared screening coating comprises tin oxide and said doping agent comprises ions or atoms of antimony and/or fluorine and/or chlorine.
Claim 5
Dependent Claim
29 words
The combination as recited in claim 2 wherein said infrared screening coating comprises indium oxide and said doping agent comprises ions or atoms of tin and/or fluorine and/or chlorine.
Claim 6
Dependent Claim
18 words
The combination as recited in claim 1 wherein said infrared screening coating has a minimum thickness of 1000A.
Claim 7
Dependent Claim
40 words
The combination as recited in claim 1 wherein beneath said infrared screening coating there is a foundation layer of material which is chemically inert in relation to such coating and the material of the coated face of the coated sheet.
Claim 8
Dependent Claim
19 words
The combination as recited in claim 6 wherein said coating comprises indium oxide and said foundation layer comprises silica.
Claim 9
Dependent Claim
22 words
The combination as recited in claim 1 wherein the visible light transmission of the screen is greater than or equal to 20%.
Claim 10
Dependent Claim
19 words
The combination as recited in claim 1 wherein said sheet bearing said infrared screening coating has been chemically tempered.
Claim 11
Dependent Claim
39 words
A heat insulating screen according to claim 1 wherein beneath said coating there is a foundation layer of material which is chemically inert in relation to such coating and the material of the coated face of the coated sheet.
Claim 12
Dependent Claim
20 words
A heat insulating screen according to claim 10 wherein said coating comprises indium oxide and said foundation layer comprises silica.
Claim 13
Dependent Claim
123 words
A heat insulating screen adapted to form part of an oven or furnace, comprising first and second transparent sheets of glass or vitrocrystalline material disposed in facing relation to each other, the first sheet which is directed toward the outside of the oven or furnace being chemically tempered, and the second sheet which is directed toward the inside of the oven or furnace including means having a low energy transmission and a high energy reflection in the wavelength range of from about 0.8 to 15 microns, said means including an infrared screening coating on said second sheet, wherein said coating comprises an oxide or a mixture of oxides, at least one oxide selected from the group consisting of tin oxide and indium oxide.
Claim 14
Dependent Claim
123 words
A heat insulating screen adapted to form part of an oven or furnace, comprising first and second transparent sheets of glass or vitrocrystalline material disposed in facing relation to each other, the first sheet which is directed toward the outside of the oven or furnace being chemically tempered, and the second sheet which is directed toward the inside of the oven or furnace including means having a low energy transmission and a high energy reflection in the wavelength range of from about 0.8 to 15 microns, said means including an infrared screening coating on said second sheet, wherein said coating comprises an oxide or a mixture of oxides, at least one oxide selected from the group consisting of tin oxide and indium oxide.
Claim 15
Dependent Claim
33 words
A screen as recited in claim 12, wherein said second sheet is composed of a borosilicate glass, which has a coefficient of thermal expansion of less than 5 × 10.sup. -6 /° C.
Claim 16
Dependent Claim
45 words
A heat insulating screen according to claim 12 wherein said chemically tempered glass or vitrocrystalline sheet is a sheet which has been subjected to a chemical tempering treatment of a kind involving the exchange of alkali metal ions between the sheet and a treatment medium.
Claim 17
Dependent Claim
41 words
A heat insulating screen according to claim 14 wherein said chemically tempered glass or vitrocrystalline sheet is a sheet which has been subjected to a chemical treatment involving the diffusion of potassium ions into the sheet in exchange for sodium ions.
Claim 18
Dependent Claim
40 words
A heat insulating screen according to claim 12 wherein said sheets are spaced apart by a distance at least equal to the thickness of a sheet which is of minimum thickness in relation to all of the sheet thicknesses provided.
Claim 19
Dependent Claim
16 words
A heat insulating screen according to claim 12 wherein said oxide coating contains a doping agent.
Claim 20
Dependent Claim
31 words
A heat insulating screen according to claim 17 wherein said doping agent comprises ions or atoms of antimony and/or fluorine and/or chlorine in the case of a coating of tin oxide.
Claim 21
Dependent Claim
31 words
A heat insulating screen according to claim 17 wherein said doping agent comprises ions or atoms of tin and/or fluorine and/or chlorine in the case of a coating of indium oxide.
Claim 22
Dependent Claim
18 words
A heat insulating screen according to claim 12 wherein said oxide coating has a minimum thickness of 1000A.
Claim 23
Dependent Claim
23 words
A heat insulating screen according to claim 12 wherein the visible light transmission of the screen is greater than or equal to 20%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |