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US 4,916,352 AGranted
Jacketed fluorescent lamps
AssigneeGeneral Electric Company
InventorsElias S. Haim, Frank W. McGlasson
Life of this patent
Estimating the term…
Abstract
A fluorescent lamp structure having a light transparent jacket surrounding the lamp. The chamber between the lamp and jacket is filled with a fluid (or mixture of fluids) which transitions between the liquid and vapor phases. The fluid extracts heat when the lamp wall temperature rises above a predetermined temperature causing the fluid to vaporize. The fluid condenses to form a partial vacuum in the chamber below that temperature.
Claims2
A light source comprising:
- (a) a fluorescent lamp;
- (b) a light transmissive jacket surrounding and fused to said fluorescent lamp and defining a sealed chamber surrounding said lamp;
- (c) fluid means comprising a mixture of fluids retained in said chamber, said fluid means being selected to be in a liquid phase below a selected temperature to form at least a partial vacuum to reduce heat loss from the lamp, and in a vapor phase above said selected temperature to extract heat from the lamp wall.
A light source comprising:
- (a) a fluorescent lamp;
- (b) a light transmissive glass jacket surrounding said fluorescent lamp and being fused thereto and defining a sealed chamber surrounding said lamp;
- (c) fluid means comprising a mixture of fluids retained in said chamber, said fluid means being selected to be in a liquid phase below a selected temperature to form at least a partial vacuum to reduce heat loss from the lamp, and in a vapor phase above said selected temperature to extract heat from the lamp wall.
Dependencies are inferred from the claim text.