Multiple filament electric lamp

Details Multiple filament electric lamp Multiple filament electric lamp

1979-12-03

1981-09-01

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Multiple filament load devices

313316, 315 68, 315 64, H01J 744, H01J 1734, H01J 1978, H01K 162

Patent

active

042874521

ABSTRACT:
A multiple filament incandescent lightbulb automatically places an unused alternate filament in a closed electric circuit upon rupture of an active filament. The alternate filament is placed in a closed circuit by release of an elastically deformed switching member originally held in place by the active filament.

REFERENCES:
patent: 1456568 (1923-05-01), Quandt
patent: 2862147 (1958-11-01), Conti
patent: 3382403 (1968-05-01), Lloyd
patent: 3886400 (1975-05-01), Dill
patent: 3983447 (1976-09-01), Mark et al.
patent: 4121134 (1978-10-01), Fontenelle
patent: 4179637 (1979-12-01), Santora

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