Immersion pipe for vacuum degassing apparatus

Claim 1

IN A VACUUM DEGASIFICATION DEVICE FOR MOLTEN METAL HAVING, AS ELEMENTS THEREOF, IN ONE ABOVE THE OTHER ARRANGEMENT, CONTAINER MEANS FOR MOLTEN METAL TO BE DEGASIFIED, DEGASIFICATION CHAMBER MEANS FOR SUCH METAL AND CONDUIT MEANS CONNECTING SAID CHAMBER MEANS WITH SAID CONTAINER MEANS, SAID CONDUIT MEANS BEING POSITIONED FOR IMMERSION IN SAID CONTAINER MEANS INTO A MOLTEN METAL ZONE THEREIN, IN COMBINATION, CONDUIT MEANS FOR MOLTEN METAL POSITIONED TO EXTEND INTO SAID ZONE AND HAVING TWO SUBSTANTIALLY CONCENTRICALLY EXTENDING, RADIALLY SPACED APART CERAMIC TUBULAR MEMBERS, A METALLIC TUBULAR MEMBER DISPOSED CONCENTRICALLY BETWEEN SAID CERAMIC MEMBERS AND HAVING A LENGTH SUBSTANTIALLY EXTENDING AT LEAST TO THE UPPER LEVEL OF SAID MOLTEN METAL ZONE, ALL OF SAID TUBULAR MEMBERS EXTENDING INTO SAID MOLTEN METAL ZONE, AND MEANS AT THE UPPER END OF SAID TUBULAR MEMBERS POSITIONED AT A POINT ABOVE THE LEVEL OF THE MOLTEN METAL FOR SUSPENDING SAID TUBULAR MEMBERS TO FORM CYLINDRICAL GAPS BETWEEN SAID METALLIC TUBULAR MEMBER AND EACH OF SAID CERAMIC TUBULAR MEMBERS, SAID CYLINDRICAL GAPS EXTENDING FRO SAID SUSPENDING MEANS TO THE ENDS OF THE TUBULAR MEMBERS DISPOSED IN SAID MOLTEN METAL ZONE, SAID CYLINDRICAL GAPS BETWEEN