Incandescent lighting

Details Incandescent lighting Incandescent lighting

1982-06-08

1985-02-12

Boudreau, Leo H.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

313578, 313271, 313274, 313275, 313276, 313315, 315 64, 315 69, 315 73, H01K 124, H01K 164, H01K 118

Patent

active

044993986

ABSTRACT:
An improved incandescent light bulb which is capable of affording increased light efficiency without a resultant increase in either cost or energy consumption. In one embodiment of the bulb, said bulb includes a refractory stiff supporting element, at least one elongated helical resistive filament, two terminals which are each capable of being physically and electrically connected to a different socket and an elongated light transmissive envelope. In another embodiment the bulb additionally includes a reflector bonded to the envelope which reflects light and conducts heat away from said envelope. The stiff supporting element is formed to have a hollow interior. In said hollow interior a magnetizable elongated slug and two holding magnets may be contained. The slug and holding magnets cooperate with a switching means in the interior of the envelope to allow the bulb to selectively emit either a bright or a dim light.

REFERENCES:
patent: 1733504 (1929-10-01), MacDonald
patent: 3028523 (1962-04-01), Seid
patent: 3080497 (1963-03-01), Noel et al.
patent: 3211938 (1965-10-01), Holcomb
patent: 3638068 (1972-01-01), Wilson

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