Envelopes for tungsten-halogen lamps

Details Envelopes for tungsten-halogen lamps Envelopes for tungsten-halogen lamps

1981-09-08

1983-07-19

Bell, Mark

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C03C 308

Patent

active

043944531

ABSTRACT:
The present invention is directed to glasses especially suitable as envelopes for tungsten-halogen lamps. The glasses exhibit strain points of at least about 670.degree. C., a coefficient of thermal expansion (0.degree.-300.degree. C.) of 42-45.times.10.sup.-7 /.degree.C. and can be readily melted and shaped utilizing conventional glass melting and high speed tube drawing processes. The glasses consist essentially, in weight percent, of

REFERENCES:
patent: 3496401 (1970-02-01), Dumbaugh, Jr.
patent: 3798491 (1974-03-01), Molm
patent: 3978362 (1976-08-01), Dumbaugh, Jr. et al.
patent: 4060423 (1977-11-01), Thomas
patent: 4255198 (1981-03-01), Danielson et al.
patent: 4302250 (1981-11-01), Danielson

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