Patents Assigned to Wolfram, Inc.
  • Lead metallizing process to avoid seal oxidation
    Patent number: 4891553
    Abstract: An improved high wattage mercury halide lamp which has the follower rod of the electrode ribbon assembly brazed to a side arm of a quartz arc tube with ductile alloy brazing composition which effectively seals the side arm and the electrode follower to prevent lead oxidation, metal expansion and attendant damage to the integrity of the lamp. The result is longer life high wattage mercury halide lamps.
    Type: Grant
    Filed: June 28, 1988
    Date of Patent: January 2, 1990
    Assignee: Wolfram, Inc.
    Inventors: William I. Bamberg, Keith P. Cordero