1976-04-05
1978-04-04
Lazarus, Richard B.
316 20, 316 24, H01J 938
Patent
active
040823920
ABSTRACT:
The invention is concerned with a process for sealing a gas at elevated pressures within a gas discharge lamp without the necessity for freezing down the gas within the lamp. The process comprises providing a hollow vitreous body having an orifice leading from an exterior to an interior thereof and a first vitreous tube extending from said orifice externally of the body. The first tube and the interior of the body are pressurized with gas. A vitreous bead of a first type of glass is positioned in the first tube, the bead having a softening temperature below a softening temperature of the first tube and having a thermal expansion differential within about 1000 parts per million of the first tube. Without freezing down the gas the first tube and the bead are heated to a first temperature sufficient to soften the bead but not soften the first tube to wet and seal the first tube with the softened bead. Finally, the sealed tube is cooled. Also disclosed are a variety of apparatus for carrying out the above process.
REFERENCES:
patent: 2324557 (1943-07-01), Claesson et al.
patent: 2694273 (1954-11-01), Spyret
patent: 2697311 (1954-12-01), Polan
patent: 2795018 (1957-06-01), Shaw
patent: 3151967 (1964-10-01), Zurick
patent: 3628846 (1971-12-01), Cortorillo
patent: 3914000 (1975-10-01), Beckerman et al.
"Solder Glasses", by R. E. Hogan, in Jan. 1971 issue of Chem. Tech. at pp. 41-43.
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