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US 4,234,819 AGranted
Underwater light circuit and installation
AssigneePurex Corporation
InventorEugene R. Maxey
Life of this patent
Estimating the term…
Abstract
An underwater light circuit employs electrodes exposed to water, a light, and circuitry connected with the electrodes and light filament to control current flow to the filament.
Claims9
In an underwater light circuit, the combination comprising
- (a) first and second terminals across which AC power is applicable, and a ground connection,
- (b) a pair of electrodes exposed for contact with the water, one electrode electrically connected with the first of said terminals, and the other electrode connection with said ground connection,
- (c) a network including resistance and capacitance connected in series between said one electrode and said first terminal,
- (d) an electric lamp having a filament, and a first gate controlled switch connected in series with the filament between said first and second terminals,
- (e) said network electrically connected with the gate of said first switch to effect turn-on of said first switch in response to predetermined charging of said capacitance to predetermined voltage level,
- (f) and a second gate controlled switch connected in series with said network, said one electrode connected with the gate of said second switch to effect turn-on of said second switch when current passes between said electrodes, thereby to effect current flow between said terminals and charging of said capacitance to said voltage level.
3 more elements
Dependencies are inferred from the claim text.