Method of making heat insulating panels

Claim 1

A METHOD OF MAKING A HEAT INSULATING PANEL FORMED OF AN ENVELOPE HAVING TOP AND BOTTOM PLATES AND THIN PLANAR SIDE WALLS WITH TOP AND BOTTOM FLANGES OVERLAPPING THE CLOSELY SPACED MARGINAL EDGES OF THE PLATES, WHICH METHOD CONSISTS OF TREATING THE ENVELOPE PARTS FOR BONDING TOGETHER WITH A HEAT SOLUBLE BONDING MATERIAL, ASSEMBLING THE THIN PLANAR SIDE WALLS WITH THE BOTTOM FLANGES THEREOF OVERLAPPING THE CLOSELY SPACED MARGINAL EDGES OF THE BOTTOM PLATE, FILLING THE ENVELOPE WITH A WALL SUPPORTING GAS CONTAINING POROUS FILLER, ASSEMBLING THE TOP PLATE WITH THE CLOSELY SPACED MARGINAL EDGES THEREOF OVERLAPPED BY THE TOP FLANGES ON THE THIN PLANAR SIDE WALLS, ENCLOSING THE ENVELOPE IN A JIG WHEREIN THE SIDE WALLS ARE RIGIDLY AND CLOSELY SUPPORTED AGAINST OUTWARD MOVEMENT AND THE TOP AND BOTTOM FLANGES ARE INTERPOSED BETWEEN RESILIENT MEMBERS, HEATING THE ASSEMBLY TO A TEMPERATURE BELOW THE MELTING POINT OF THE HEAT SOLUBLE BONDING MATERIAL TO DEGAS THE POROUS FILLER, EVACUATING THE HEATED ASSEMBLY, APPLYING RESILIENT AND UNIFORM CLAMPING PRESSURE TO THE TOP AND BOTTOM FLANGES AND SUBSEQUENTLY FURTHER RAISING THE TEMPERATURE TO MELT THE HEAT SOLUBLE BONDING MATERIAL AND THEREBY SEAL AND BOND THE PARTS OF THE EVACUATED ENVELOPE.

Claim 2

A METHOD OF MAKING A HEAT INSULATING PANEL FORMED OF AN ENVELOPE HAVING TOP AND BOTTOM PLATES AND THIN PLANAR SIDE WALLS WITH TOP AND BOTTOM FLANGES OVERLAPPING THE CLOSELY SPACED MARGINAL EDGES OF THE PLATES, WHICH METHOD CONSISTS OF TREATING THE ENVELOPE PARTS FOR BONDING TOGETHER WITH A HEAT SOLUBLE BONDING MATERIAL, ASSEMBLING THE THIN PLANAR SIDE WALLS WITH THE BOTTOM FLANGES THEREOF OVERLAPPING THE CLOSELY SPACED MARGINAL EDGES OF THE BOTTOM PLATE, FILLING THE ENVELOPE WITH A WALL SUPPORTING GAS CONTAINING POROUS FILLER, ASSEMBLING THE TOP PLATE WITH THE CLOSELY SPACED MARGINAL EDGES THEREOF OVERLAPPED BY THE TOP FLANGES ON THE THIN PLANAR SIDE WALLS, ENCLOSING THE ENVELOPE IN A JIG WHEREIN THE SIDE WALLS ARE RIGIDLY AND CLOSELY SUPPORTED AGAINST OUTWARD MOVEMENT AND THE TOP AND BOTTOM FLANGES ARE INTERPOSED BETWEEN RESILIENT MEMBERS, HEATING THE ASSEMBLY TO A TEMPERATURE BELOW THE MELTING POINT OF THE HEAT SOLUBLE BONDING MATERIAL TO DEGAS THE POROUS FILLER, EVACUATING THE HEATED ASSEMBLY, APPLYING RESILIENT AND UNIFORM CLAMPING PRESSURE TO THE TOP AND BOTTOM FLANGES AND SUBSEQUENTLY FURTHER RAISING THE TEMPERATURE TO MELT THE HEAT SOLUBLE BONDING MATERIAL AND THEREBY SEAL AND BOND THE PARTS OF THE EVACUATED ENVELOPE.