Patent ID: 7116048

Claim:
An electric lamp having a sealed lead comprising: a lamp envelope having an inner wall defining a enclosed volume, the enclosed volume including a luminous element electrically connected through the envelope by a sealed lead assembly, the sealed lead assembly including a glass body formed with a through passage, the glass body being retained by the inner wall; a tungsten body having a first portion not located in the passage, and a second portion extended through the passage, the tungsten body being retained relative to the glass body by at least one molybdenum foil, the foil having a first face having a ruthenium coating and being welded along said first face to the first portion of the tungsten body, the foil having a second face not having ruthenium coating; the foil extending in the passage intermediate the second portion of the tungsten body and the glass body, with the second face adjacent the glass body; the foil further being shaped adjacent the first portion of the tungsten body to form a mechanical block to block axial motion of the glass body relative to the tungsten body at least in one axial direction.