Electric incandescent lamp

Details Electric incandescent lamp Electric incandescent lamp

1980-04-14

1982-05-25

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Incandescent lamps

313112, 313113, H01J 142, H01K 908

Patent

active

043319017

ABSTRACT:
In the electric incandescent lamps having an infrared radiation-reflecting filter which is pervious to visible light, the efficiency can be increased by adapting the geometry of the filter and the geometry of the filament to each other. According to the invention, the filter comprises a major portion of a prolate ellipsoid of revolution and a cylindrical filament extends between the foci thereof, the distance between focal points being from 1-2 times the length of the filament.

REFERENCES:
patent: 1804049 (1931-05-01), Claus
patent: 3038372 (1962-06-01), Lessman
patent: 3344303 (1967-09-01), Prenger
patent: 4041344 (1977-08-01), LaGiusa
patent: 4227113 (1980-10-01), Walsh

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