Electric lamp and discharge devices – With gas or vapor – Incandescent filament lamp
Patent
1981-01-22
1983-10-11
Smith, Alfred E.
Electric lamp and discharge devices
With gas or vapor
Incandescent filament lamp
313634, 313636, 313315, H01K 122
Patent
active
044095163
ABSTRACT:
An incandescent lamp of the tungsten halogen type is disclosed which includes the tipped-off residue of an exhaust tube formed with a high temperature aluminosilicate glass comprising in approximate weight percent 56-63 SiO.sub.2, 13-17 Al.sub.2 O.sub.3, 19-24 BaO, 1-4.5 CaO, and 0-3 R.sub.2 O wherein R is an alkali metal ion, along with minor amounts of incidental impurities, residual fluxes and refining agents such that the aggregate BaO and CaO content lies within the approximate range 21-26 weight percent in order to eliminate need for the refractory metal spiral being contained within said exhaust tube in order to keep said exhaust tube open while the lamp lead-in wires are being hermetically sealed in the lamp envelope. The same glass composition can also be employed to form the entire lamp glass envelope along with the exhaust tube portion thereof with comparable results.
REFERENCES:
patent: 3798491 (1974-03-01), Malm
patent: 4139794 (1979-02-01), Malm et al.
patent: 4238705 (1980-12-01), Thomas
patent: 4366409 (1982-12-01), Nieda et al.
Graff William A.
Thomas George L.
General Electric Company
Jacob Fred
McDevitt John F.
O'Shea Sandra L.
Schlamp Philip L.
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