High pressure discharge lamps seal and base

Claim 1

AN ELECTRIC DISCHARGE LAMP COMPRISING A QUARTZ BULB CONTAINING AN UNCONDENSIBLE GAS AND HAVING ELECTRODES SEALED AND SUPPORTED THEREIN THROUGH STEM TUBE ASSEMBLIES, EACH ASSEMBLY COMPRISING A CURRENT INLEAD INCLUDING ELECTRODE ROD, FOIL CONDUCTOR AND OUTER CONDUCTOR JOINED IN SERIES, A QUARTZ STEM TUBE INCLUDING A RELATIVELY SMALL DIAMETER THICK-WALLED SECTION JOINED TO SAID ENVELOPE AND HAVING A BORE ACCOMMODATING SAID ELECTRODE ROD EXTENDING THERETHROUGH INTO SAID ENVELOPE, AND A LARGER DIAMETER THIN-WALLED SECTION JOINED TO SAID SMALLER DIAMETER SECTION, THE OUTER PORTION ONLY OF SAID LARGER DIAMETER SECTION BEING PINCHED DOWN UPON SAID FOIL IN A CONFINED PINCH HAVING A WIDTH NOT SUBSTANTIALLY GREATER THAN THE UNPINCHED PORTION, THE UNPINCHED INNER PORTION FORMING A GENERALLY TUBULAR CHAMBER NOT HERMETICALLY SEALED OFF FROM SAID BULB, AND A BASE HAVING A CYLINDRICAL PORTION OVERREACHING SAID CONFINED PINCH OUTER PORTION AND EXTENDING OVER THE UNPINCHED INNER PORTION AND FASTENED THERETO, AND A CONNECTION BETWEEN SAID OUTER CONDUCTOR AND SAID BASE.