Method of controlling deposition of crystalline material from solution on a seed by use of a temperature profile curve

Claim 1

IN THE METHOD OF GROWING A CRYSTAL WITHIN A SEEDGROWING CHAMBER BY A NUTRIENT SOLUTION INTER-EXCHANGED WITH A COMMUNICATING SUPPLY CHAMBER; THE STEPS OF FORMING AN ISOLATED ZONE SIMULTANEOUSLY EXTENDING THROUGH BOTH CHAMBERS FREE OF CONTACT WITH THE WALLS THEREOF, APPLYING HEAT TO SUCH SUPPLY CHAMBER WHILE RADIATING HEAT FROM SUCH SEED-GROWING CHAMBER TO INDUCE INDEPENDENT CIRCULATION OF THE SOLUTION IN EACH CHAMBER, EXCHANGING THE SOLUTION FROM EACH CHAMBER TO THE OTHER IN AN UNCHANNELIZED FLOW, SIMULTANEOUSLY PASSING THERMAL-SENSING MEANS THROUGH SUCH ZONE TO DETERMINE THE TEMPERATURE AT A PLURALITY OF POINTS THEREIN TO DETERMINE A TEMPERATURE PROFILE IN SAID CHAMBERS FREE OF THERMAL INFLUENCE OF SUCH WALLS OF THE CHAMBERS, AND VARYING SUCH APPLICATION OF HEAT TO THE SUPPLY CHAMBER IN ACCORDANCE WITH THE TEMPERATURE PROFILE DATA SO OBTAINED TO PROVIDE CONDITIONS IN SUCH CHAMBERS CONDUCTIVE TO DESIRED CRYSTAL GROWTH.