Two filament electric bulb traffic light

Details Two filament electric bulb traffic light Two filament electric bulb traffic light

1975-03-28

1976-07-06

Miller, Jr., Stanley D.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Multiple filament load devices

315129, 313222, 340 46, 340251, H01J 744, B60Q 900

Patent

active

039683958

ABSTRACT:
A two filament light bulb in a traffic signal generator has a main filament and an auxiliary filament. The light bulb is a two filament halogen light bulb and the traffic light controller includes apparatus for periodically and alternately exchanging the role of main and auxiliary for the two filaments.

REFERENCES:
patent: 2166721 (1939-07-01), Jeffers
patent: 3148016 (1964-09-01), Fisher
patent: 3221210 (1965-11-01), Mullings
patent: 3309563 (1967-03-01), McKienzie
patent: 3609681 (1971-09-01), Saul
patent: 3626236 (1971-12-01), Robinson et al.
patent: 3631441 (1971-12-01), Murphy
patent: 3646386 (1972-02-01), Rijnders
patent: 3736452 (1973-05-01), Rijnders
Proceedings IEE, vol. 117, No. 10, Oct. 1970, pp. 1953-1959 (Note Topic No. 5 and FIG. 8).

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