Process for production of lost models in precision casting operations

Claim 1

A PROCESS FOR THE MANUFACTURE OF A LOST MODEL FOR USE IN THE MAKING OF PRECISION CASTINGS WHICH COMPRISES MIXING A MAJOR PORTION BY WEIGHT OF A FINELY DIVIDED CRYSTALLINE MATERIAL, A MINOR PORTION BY WEIGHT OF A FINELY DIVIDED ORGANIC MATERIAL AND A LIQUID SOLVENT FOR SAID CRYSTALLINE MATERIAL TO FORM A FLOWABLE PATTERN MIXTURE FOR SAID LOST MODEL, SAID LIQUID SOLVENT CAPABLE OF BEING SOLVENT ABSORBED BY SAID ORGANIC MATERIAL UPON CONTANCT THEREWITH TO CAUSE SWEELING OF THE ORGANIC MATERIAL AND BEING CAPABLE TO FORMING A PHYSICAL BOND WITH SAID ORANGIC MATERIAL BREAKABLE BY ALTERNATIONS OF PRESSURE AND COMPRESSING SAID PATTERN MIXTURE TO CAUSE PLASTIC DEFORMATION AT A PRESSURE SUFFICIENT TO AT LEAST PARTIALLY BREAK SAID PHYSICAL BND AND TO REMOVE SAID ABSORBED SOLVENT FROM SAID ORGANIC MATERIAL WHREBY THE RELEASED SOLVENT PARTIALLY DISSOLVES THE CRYSTALLINE MATERIAL AND SERVES AS LUBRICANT IN FORMING THE LOST MODEL.