Device for treating semi-conductor materials by melting

Claim 1

APPARATUS FOR TREATING SEMICONDUCTIVE MATERIALS BY MELTING WHICH SEMICONDUCTIVE MATERIALS WHEN MOLTEN PRODUCE VAPORS CAPABLE OF FORMING OPAQUE DEPOSITS, COMPRISING A CHAMBER HAVING WALL PORTIONS AND WITHIN THE CHAMBER MEANS FOR SUPPORTING A CRYSTALLINE ROD-LIKE BODY OF SAID SEMICONDUCTIVE MATERIAL WITH RESPECT TO A MELT MEANS FOR HEATING AT LEAST A PORTION OF THE SEMICONDUCTIVE MATERIAL AT A TEMPERATURE AT WHICH IT MELTS, A WALL PORTION OF SAID CHAMBER BEING AT LEAST PARTLY TRANSPARENT AND SERVING AS AN OBSERVATION WINDOW FOR THE MELT, SAID OBSERVATION WINDOW BEING EXPOSED TO THE MELT AND THUS SUBJECT TO THE GROWTH OF SAID OPAQUE DEPOSITS THEREON WHICH OBSCURE CONTINUED OBSERVATION OF THE MELT THROUGH THE WINDOW, AND INTEGRAL WITH SAID OBSERVATION WINDOW A MATERIAL HAVING A HIGHER ABSORPTION POWER FOR HEAT RADIATION THAN MATERIALS OF ADJACENT WALL PORTIONS OF THE CHAMBER WHEREBY THE SAID OBSERVATION WINDOW IS MAINTAINED BY ABSORPTION OF HEAT RADIATION AT A HIGHER TEMPERATURE THAN THE ADJACENT WALL PORTION THEREBY REDUCING THE TENDENCY FOR DEPOSITS TO GROW THEREON AND OBSCURE VISION THERETHROUGH.