Apparatus and process for differential tempering of glass

Claim 2

A PROCESS FOR DIFFERENTIAL TEMPERING OF SHEET GLASS, COMPRISING THE STEPS OF HEATING THE GLASS SHEET IN A FURNACE TO A PREDETERMINED SOFTENED CONDITION, WITHDRAWING A GLASS SHEET FROM THE FURNACE IN WHICH IT HAS BEEN SOFTENED TO A RELATIVELY COOL ENVIRONMENT COMPARED TO THE FURNACE, LOCATING THE SHEET VERTICALLY BETWEEN TWO VERTICAL REFLECTING PLATES TO WHICH ARE SYMMETRICALLY ATTACHED COOLING ELEMENTS HAVING THE OUTLINE OF AT LEAST ONE RESERVED ZONE TO BE PRODUCED IN THE SHEET AND MADE OF A HEAT CONDUCTIVE MATERIAL HAVING A THERMAL DIFFUSIVITY GREATER THAN 0.10 C.G.S., THE RESERVED ZONE HAVING AN AREA SUBSTANTAILLY LESS THAN THAT OF THE NTTIRE GLASS SHEET AND THE COMBINED THICKNESS OF EACH COOLING ELEMENT AND THE ADJACENT PORTION OF ITS REFLECTING PLATE BEING GREATER THAN THE THICKNESS OF THE GLASS SHEET, DRAWING THE COOLING ELEMENTS SYMMERTRICALLY TOWARDS THE FACES OF THE SOFTENED SHEET TO WITHIN A DISTANCE OF LESS THAN 30-HUNDREDTHS OF A MILLIMETER FOR A PERIOD OF LESS THAN 10 SECONDS TO DEFINE THE RESERVED ZONE IN THE SHEET, WITHDRAWING THE COOLING ELEMTS FROM THE SHEET, AND SUBJECTING THE WHOLE SURFACE OF THE SHEET TO VIGOROUS COOLING TO HIGHLY TEMPER THE PARTS OF THE SHEET OUTSIDE THE RESERVED ZONE AND SUBJECT SAID ZONE TO MODERATE TEMPERING.

Claim 3

APPARATUS FOR DIFFERENTIALLY TEMPERING GLASS SHEETS COMPRISING A PAIR OF SPACED VERTICALLY PSOITIONED REFLECTING PLATES, MEANS FOR SUPPORTING A SOFTENED GLASS SHEET THEREBETWEEN, A COOLING ELEMENT ON EACH OF SAID REFLECTING PLATES, SAID COOLING ELEMENTS BEING POSITIONED OPPOSITE ONE ANOTHER AND EACH HAVING THE OUTLINE OF A RESERVED ZONE TO BE PRODUCED IN THE SHEET, SAID COOLING ELEMENTS BEING MADE OF A HEAT CONDUCTIVE MATERIAL HAVING A THERMAL DIFFUSIVITY GREATER THAN 0.10 C.G.S., THE SURFACE AREA OF EACH OF SAID COOLING ELEMNTS BEING SUBSTANTIALLY LESS THAN THAT OF THE ENTIRE GLASS SHEET AND THE COMBINED THICKNESS OF EACH COOLING ELEMENT AND THE ADJACENT PORTION OF ITS REFLECTING PLATE BEING GREATER THAN THE THICKNESS OF THE GLASS SHEET TO BE TEMPERED, MEANS FOR MOVING SAID REFLECTING PLATES AND COOLING ELEMENTS TOWARD THE FACES OF THE SIFTENED SHEET OF GLASS DISPOSED THEREBETWEEN, MEANS FOR POSITIONING EACH OF SAID COOLING ELEMTNS WITHIN A DISTANCE OF LESS THAN 0.30 MM. FROM THE OPPOSITE FACES OF THE GLASS SHEET, RESPECTIVELY, TO DEFINE THE RESERVED ZONE IN THE GLASS SHEET, MEANS FOR WITHDRAWIN SAID COOLING ELEMTNS FROM THE GLASS SHEET, AND MEANS FOR VIGOROUSLY COOLING THE ENTIRE AREA OF THE GLASS SHEET TO HIGHLY TEMPERA THE PARTS OF THE SHEET OUTSIDE THE RESERVED ZONE AND TO SUBJECT THE ZONE TO MODERATE TEMPERING.

Claim 4

APPARATUS FOR DIFFERENTIALLY TEMPERING GLASS SHEETS COMPRISING A PAIR OF SPACED VERTICALLY PSOITIONED REFLECTING PLATES, MEANS FOR SUPPORTING A SOFTENED GLASS SHEET THEREBETWEEN, A COOLING ELEMENT ON EACH OF SAID REFLECTING PLATES, SAID COOLING ELEMENTS BEING POSITIONED OPPOSITE ONE ANOTHER AND EACH HAVING THE OUTLINE OF A RESERVED ZONE TO BE PRODUCED IN THE SHEET, SAID COOLING ELEMENTS BEING MADE OF A HEAT CONDUCTIVE MATERIAL HAVING A THERMAL DIFFUSIVITY GREATER THAN 0.10 C.G.S., THE SURFACE AREA OF EACH OF SAID COOLING ELEMNTS BEING SUBSTANTIALLY LESS THAN THAT OF THE ENTIRE GLASS SHEET AND THE COMBINED THICKNESS OF EACH COOLING ELEMENT AND THE ADJACENT PORTION OF ITS REFLECTING PLATE BEING GREATER THAN THE THICKNESS OF THE GLASS SHEET TO BE TEMPERED, MEANS FOR MOVING SAID REFLECTING PLATES AND COOLING ELEMENTS TOWARD THE FACES OF THE SIFTENED SHEET OF GLASS DISPOSED THEREBETWEEN, MEANS FOR POSITIONING EACH OF SAID COOLING ELEMTNS WITHIN A DISTANCE OF LESS THAN 0.30 MM. FROM THE OPPOSITE FACES OF THE GLASS SHEET, RESPECTIVELY, TO DEFINE THE RESERVED ZONE IN THE GLASS SHEET, MEANS FOR WITHDRAWIN SAID COOLING ELEMTNS FROM THE GLASS SHEET, AND MEANS FOR VIGOROUSLY COOLING THE ENTIRE AREA OF THE GLASS SHEET TO HIGHLY TEMPERA THE PARTS OF THE SHEET OUTSIDE THE RESERVED ZONE AND TO SUBJECT THE ZONE TO MODERATE TEMPERING.