Improving incandescent bulb efficiency

Details Improving incandescent bulb efficiency Improving incandescent bulb efficiency

1977-09-07

1980-04-01

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313315, 313344, H01J 114, H01J 1906, H01K 104

Patent

active

041963687

ABSTRACT:
Incandescent light bulb efficiency is improved by: (1) modifying the surface micro-structure of a lamp filament in such a way as to increase the emissivity in the visible region of the spectrum without significantly increasing this quantity outside this spectral region, or suppressing the emission of energy outside the visible portion of the spectrum by modifying the surface structure; (2) application of refractory coatings on the lamp filament that are highly emissive in the visible region of the spectrum; and (3) coating the filament with an "optically thin" refractory material to suppress filament evaporation, permitting higher operating temperature.

REFERENCES:
patent: 2170683 (1939-08-01), Friederich et al.
patent: 2450007 (1948-09-01), Litton
patent: 3969131 (1976-07-01), Fatzer et al.
patent: 3973155 (1976-08-01), Warren et al.
patent: 4016446 (1977-05-01), Cadoff
patent: 4160929 (1979-07-01), Thorington et al.

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