Hermetically sealed, sheathed electric heating elements

Claim 1

AN ELECTRIC RESISTANCE HEATING ELEMENT COMPRISING A TUBULAR METALLIC SHEATH AND A RESISTOR CONDUCTOR IN RADIALLY SPACED RELATION WITH SAID CONDUCTOR DISPOSED WITHIN SAID SHEATH IN AXIALLY SPACED RELATION FROM ONE END THEREOF, A TERMINAL CONDUCTOR PIN SECURED TO SAID RESISTOR CONDUCTOR WITHIN SAID SHEATH AND PROJECTING OUTWARDLY OF SAID ONE SHEATH END, COMPACTED, ELECTRIC-INSULATING, HEAT-CONDUCTIVE MATERIAL WITHIN SAID SHEATH EMBEDDING SAID RESISTOR AND TERMINAL CONDUCTORS AND SUCH MATERIAL TERMINATING SHORT OF SAID ONE SHEATH END TO FORM A RECESS THEREAT, A METALLIC SLEEVE HAVING A FLUID-TIGHT FUSED CONNECTION WITH SAID ONE SHEATH END AND PROJECTING AXIALLY THEREBEYOND, A METALLIC CAP HAVING A FLUID-TIGHT FUSED CONNECTION WITH THE OUTWARDLY PROJECTING PORTION OF SAID TERMINAL PIN AND DISPOSED IN AXIALLY SPACED RELATION WITH THE METALLIC SLEEVE AFORESAID, AND CERAMIC SLEEVE MEANS THROUGH WHICH SAID TERMINAL PIN EXTENDS AND HAVING A FIRST PORTION EXTENDING BETWEEN AND HERMETICALLY SEALED TO SAID METALLIC SLEEVE AND SAID METALLIC CAP AND A SECOND PORTION EXTENDING INTO SAID SHEATH END RECESS, SAID CERAMIC SLEEVE MEANS COMPRISING A FIRST CERAMIC SLEEVE EXTENDING OVER SAID TERMINAL PIN BETWEEN SAID METALLIC SLEEVE AND SAID METALLIC CAP AND A SECOND CERAMIC SLEEVE EXTENDING OVER SAID TERMINAL PIN AND PROJECTING FROM THE RECESS AT SAID ONE SHEATH END AXIALLY BEYOND THE LATTER.