Electric lamp with opaque cap, particularly halogen cycle, dual

Details Electric lamp with opaque cap, particularly halogen cycle, dual Electric lamp with opaque cap, particularly halogen cycle, dual

1979-08-03

1981-12-08

Segal, Robert

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Light valve or obscuring means

427106, H01J 516, H01J 6140

Patent

active

043050166

ABSTRACT:
An electric lamp, particularly a halogen cycle lamp, adapted to be used as dual filament automotive lamp which has an opaque end cap coated on the hard glass bulb. The end cap coating comprises a mixture of carbonyl iron powder and silicon powder, preferably in a ratio of between 1.5:1 and 4:1 (by weight) and more preferably in a ratio of about 2:1. The lamps have the important advantages of excellent utility during service coupled with the ability to be manufactured at relatively low burning in temperatures, i.e. in the order of about 530.degree. C.

REFERENCES:
patent: 3784861 (1974-01-01), Notelteirs et al.

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