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US 5,012,157 AGranted
Long-life luminaires
OwnerJohn F. Walton, Al R. Roshdiehinventors
Life of this patent
Estimating the term…
Abstract
There is provided a luminaire primarily for use with exit signs and other emergency-type lighting comprising a series string of low-voltage, extremely long-life bulbs positioned within an enclosure for protection and electrically connected to a standard base whereby luminaires having lives of 10 to 30 years may replace standard bulbs without the requirement of retrofitting.
Claims3
A long-life luminaire for signs powered by power company standard voltages for use in emergency lighting and signs comprising:
- a string of individual long-life, low-voltage light bulbs electrically connected in series;
- means for connecting said string across a source of said power company voltages;
- said light bulbs having a life of five years at 14 volts and ten years at 12 volts,
- at least one varistor electrically connected in parallel with the entire said string of light bulbs;
- said string of light bulbs having two ends,
- the spacing between the light bulbs in the center of said string being greater than towards the ends of said string of light bulbs.
3 more elements
A long-life luminaire for signs powered by power company standard voltages for use in emergencies, comprising:
- a first string of individual long-life, low-voltage light bulbs having electrical ends electrically connected in series;
- means for connecting said string across a source of electrical energy;
- a resistor connected in series with said string of bulbs;
- said resistor having a resistance approximately equal to that of one of said bulbs when at incandescent temperature;
- and
- at least one varistor connected across said electrical ends of the entire string of the long-life, low-voltage lamps only.
3 more elements
Dependencies are inferred from the claim text.