Electric lamp and discharge devices – With gas or vapor – Incandescent filament lamp
Patent
1987-04-27
1988-08-23
DeMeo, Palmer C.
Electric lamp and discharge devices
With gas or vapor
Incandescent filament lamp
313623, 313318, 313332, 501 15, 501 75, H01K 122, H01K 138, H01K 140
Patent
active
047663464
ABSTRACT:
To provide a melt glass (10) to seal capillary spaces (9) surrounding external current supply leads (8) of molybdenum passing to molybdenum foils (6) in a pinch or press seal (7) of a high temperature, for example incandescent halogen lamp, the melt glass (10) is made of 3-10% Bi.sub.2 O.sub.3, 25%-40% B.sub.2 O.sub.3, remainder PbO. The melt glass has low toxicity and is molybdenum-compatible. An additive of barium oxide, in up to 15% and preferably up to only about 10%, may be added to the PbO. All quantities in mol-percent.
REFERENCES:
patent: 2889952 (1959-06-01), Claypoole
patent: 3211826 (1965-10-01), Holcomb et al.
patent: 3259777 (1966-07-01), Fridrich
patent: 3588315 (1971-06-01), Levand, Jr. et al.
patent: 3645761 (1972-02-01), Kawamura et al.
patent: 4492814 (1985-01-01), Snell et al.
patent: 4493944 (1985-01-01), Snell et al.
patent: 4522925 (1985-06-01), Pirooz
Inorganic Glass-Forming Systems-U. of Sheffield, Glass Technology (Academic Press, London and New York, '67.
Material Information by Corning, Electrical Products Division, Electric Crucible Furnace Type, Simon Miller, publication "Crucible Furnaces", pp. 722-723.
Struktur und Kristallisation der Glaser" (Structure and Crystallization of Glasses", VEB Deutscher Verlag fuer Grundstoffidustrie, Leipzig (GRD, 1971), p. 93.
Posl Ewald
Weiss Werner
DeMeo Palmer C.
Patent Treuhand Gesellschaft fur elektrische Glulampen mbH
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