Electric soldering iron having a thermally insulated handle

Claim 1

A SOLDERING IRON COMPRISING AN ELONGATED HANDLE CONSISTING OF FIRST AND SECOND CONCENTRIC SLEEVES AND A CYLINDRICAL MEMBER, SAID FIRST AND SECOND SLEEVES AND SAID CYLINDRICAL MEMBER SPACED FROM EACH OTHER AND APPROXIMATELY COEXTENSIVE IN LENGTH, A LONGUITUDINAL BORE IN SAID HANDLE DEFINED BY THE INTERIOR OF SAID FIRST SLEEVE, AT LEAST ONE END OF SAID BORE BEING OPEN, A SOLDERING TIP HAVING A WORKING PORTION PARTIALLY POSITIONED IN THE OPEN END OF SAID BORE AND EXTENDING OUTWARDLY FROM ONE END OF SAID HANDLE, AN ELECTRICAL HEATING ELEMENT LOCATED WITHIN THE BORE IN SAID HANDLE AND IN HEAT EXCHANGE RELATIONSHIP WITH SAID SOLDERING TIP, A A CHAMBER DEFINED BY THE SPACE BETWEEN SAID FIRST AND SECOND SLEEVE EXTENDING SUBSTANTIALLY THE LENGTH OF AND COMPLETELY AROUND THE CIRCUMFERENCE OF SAID HANDLE, SAID CHAMBER EVACUATED TO A PRESSURE OF AT LEAST .1 MILLIMETER OF MERCURY, SAID CYLINDRICAL MEMBER POSITIONED IN SAID CHAMBER AND COMPOSED OF A MATERIAL HAVING A SUBSTANTIALLY HIGHER HEAT CONDUCTIVITY THAN THE MATERIAL OF SAID FIRST AND SECOND SLEEVES, A PLURALITY OF HEAT DISSIPATING FINS SUPPORTED ON THE END OF SAID HANDLE OPPOSITE FROM WHICH THE SOLDERING TIP EXTENDS, SAID CYLINDRICAL MEMBER PHYSICALLY CONNECTED TO SAID HEAT DISSIPATING FINS IN HEAT CONDUCTIVE RELATIONSHIP.