US3914592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater light circuit
Assignee: Hydrotech Chemical Corp
•
Filing: 1974-09-03
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Granted: 1975-10-21
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Expires: 1994-09-03
Abstract
Abstract Underwater electric light circuitry includes electrodes exposed for contact with water to cause shut-off of power to the electric lamp when the light is pulled from the water.
Inventors
- 👤 Eugene R Maxey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:12
CPC Classifications
F; F21; F21S; F21S8/00; F21V; F21V25/00; F21V25/02; F21V25/04; F21W; F21W2131/00; F21W2131/40; F21W2131/401; Y; Y10; Y10S; Y10S362/00; Y10S362/802
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
In an underwater light circuit, a. a pair of terminals across which AC power is applicable, b. a pair of electrodes exposed for contact with the water, one electrode electrically connected with one of said terminals, c. a network including resistance and capacitance connected in series between the other of said electrodes and the other of said terminals, d. an electric lamp having a filament and a gate controlled switch connected in series with the filament between said terminals, and e. means electrically connected between said network and the gate of said switch to effect turn-on of said switch in response to predetermined charging of said capacitance occurring when current passes between said electrodes.
Claim 2
Dependent Claim
114 words
In an underwater light circuit, a. a pair of terminals across which AC power is applicable, b. a pair of electrodes exposed for contact with the water, one electrode electrically connected with one of said terminals, c. a network including resistance and capacitance connected in series between the other of said electrodes and the other of said terminals, d. an electric lamp having a filament and a gate controlled switch connected in series with the filament between said terminals, and e. means electrically connected between said network and the gate of said switch to effect turn-on of said switch in response to predetermined charging of said capacitance occurring when current passes between said electrodes.
Claim 3
Dependent Claim
11 words
The circuit of claim 1 wherein said means includes a diac.
Claim 4
Dependent Claim
13 words
The circuit of claim 1 wherein said gate controlled switch comprises a triac.
Claim 5
Dependent Claim
25 words
The circuit of claim 1 including a protective shell extending about said lamp, said electrodes exposed in a space formed between the housing and lamp.
Claim 6
Dependent Claim
28 words
The circuit of claim 1 wherein one of the electrodes is dome shaped and perforate, and the other electrode projects into a recess formed by said one electrode.
Claim 7
Dependent Claim
14 words
The circuit of claim 1 wherein said resistance includes a temperature responsive resistance element.
Claim 8
Dependent Claim
24 words
The circuit of claim 1 wherein said network is electrically connected with that side of the capacitor to which said resistance is also connected.
References Cited (Backward Citations)
US3440396A
Cited
US3732556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |