Heat insulating screen
First Claim
1. 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.
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Accused Products
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.
67 Citations
21 Claims
- 1. 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.
- 12. 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.
Specification