Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For plural electrodes of discharge device
Patent
1975-08-07
1976-08-31
Douglas, Winston A.
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For plural electrodes of discharge device
106 52, 313222, H01K 128, H01K 150, H01K 700
Patent
active
039783626
ABSTRACT:
The invention relates to glasses especially suitable for the envelope of a tungsten-bromine incandescent lamp and which can be sealed directly to molybdenum. Such glasses exhibit strain points in excess of 700.degree.C., a viscosity at the liquidus, of at least 100,000 poises, and a coefficient of thermal expansion (0.degree.-300.degree.C.) between about 48-55 .times. 10.sup.-.sup.7 /.degree.C. More particularly, such glasses consist essentially, by weight on the oxide basis, of about 58-63% SiO.sub.2, 13-16% Al.sub.2 O.sub.3, 14-21% CaO, 0-5% MgO, and 0-7% BaO, the total CaO + MgO + BaO constituting at least about 19%.
REFERENCES:
patent: 3496401 (1970-02-01), Dumbaugh
patent: 3798491 (1974-03-01), Malm
patent: 3851200 (1974-11-01), Thomasson
Dumbaugh, Jr. William H.
Genisson Roger R.
Lestrat Michel R.
Bell Mark
Corning Glass Works
Douglas Winston A.
Janes Jr. Clinton S.
Patty, Jr. Clarence R.
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