Method for recrystallization of tungsten filaments for incandesc

Details Method for recrystallization of tungsten filaments for incandesc Method for recrystallization of tungsten filaments for incandesc

1995-06-15

1996-12-03

Bradley, P. Austin

Electric lamp or space discharge component or device manufacturi

Process

With start up, flashing or aging

445 42, 445 56, H01J 938, H01J 944

Patent

active

055802907

ABSTRACT:
A method for recrystallization of tungsten filaments for incandescent lamps includes the steps of providing a tungsten filament fixed to lead-in wires, providing a light-transmitting glass envelope having a closed first end and an open second end, the first end being closed by an envelope press portion integral with the remainder of the envelope, the press portion having the lead-in wires sealed therein and extending therethrough into the envelope, introducing a forming gas into the envelope, flushing the envelope with infusions of the forming gas, flashing the filament in the presence of the forming gas to recrystallize the filament, evacuating the forming gas from the envelope, introducing fill gas into the envelope, and closing the envelope second end.

REFERENCES:
patent: 1501240 (1921-08-01), Rottgardt
patent: 3210589 (1965-10-01), Mason
patent: 3901573 (1975-08-01), Dolenga et al.
patent: 4535268 (1985-08-01), Morris et al.
patent: 4810932 (1989-03-01), Ahlgren et al.
patent: 4857804 (1989-08-01), Griffin
patent: 5022880 (1991-06-01), Shaffer
patent: 5072147 (1991-12-01), Pugh et al.

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