Bent end electric lamp having lead wires anchored at ends of bend and provided with expansion portion

Claim 1

A DOUBLE-ENDED ELONGATED ELECTRIC INCANDESCENT LAMP COMPRISING A SEALED GAS-FILLED TUBULAR ENVELOPE OF VITREOUS MATERIAL, AN ELONGATED CURRENT SUPPLY LEAD-IN WIRE EXTENDING FROM THE EXTERIOR AT EACH END OF SAID ENVELOPE A SUBSTANTIAL DISTANCE INWARDLY OF THE ENVELOPE, AN INCANDESCIBLE FILAMENT EXTENDING LONGITUDINALLY OF A MAIN BODY PORTION OF SAID ENVELOPE BETWEEN THE INNER ENDS OF SAID LEAD-IN WIRES AND CONNECTED TO SAID WIRES, SEAL PORTIONS AT THE EXTREMITIES OF SAID ENVELOPE COMPRESSED UPON AND HERMETICALLY SEALED TO LOCALIZED PORTIONS OF THE RESPECTIVE LEAD-IN WIRES EXTENDING THERETHROUGH, LOCALIZED PINCH PORTIONS OF SAID ENVELOPE SPACED FROM RESPECTIVE SAID SEAL PORTIONS AND COMPRESSED UPON LOCALIZED PORTIONS OF RESPECTIVE LEAD-IN WIRES ADJACENT THEIR INNER ENDS, THE ENDS OF SAID ENVELOPE BEYOND RESPECTIVE PINCH PORTIONS EXTENDING LATERALLY OF AND A SUBSTANTIAL DISTANCE BEYOND THE MAIN BODY PORTION BY VIRTUE OF A BEND AT RESPECTIVE SAID PINCH PORTIONS, A PORTION OF EACH OF SAID LEAD-IN WIRES WHICH IS ANCHORED AT AND EXTENDS BETWEEN RESPECTIVE SEAL AND PINCH PORTIONS OF THE ENVELOPE HAVING THEREIN AN EXPANSION BEND WHICH AVOIDS THE CREATION OF EXCESSIVE STAINS IN THE SAID PINCH PORTIONS OF THE ENVELOPE.