US3599036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency lighting circuit
Assignee: Holophane Corp
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Filing: 1969-07-01
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Granted: 1971-08-10
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Expires: 1989-07-01
Abstract
Abstract In an emergency lighting circuit, a relay is provided with its coil in parallel with a capacitor in the mercury lamp circuit. Normally closed contacts of the relay are connected in series between a power supply and an incandescent lamp, in order to energize the incandescent lamp whenever the mercury lamp is deenergized.
Inventors
- 👤 Jack E Haymaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:52
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
In a gas discharge lamplighting circuit of the type comprising a gas discharge lamp, a source of energizing power for said lamp, and ballast circuit means for energizing said gas discharge lamp form said source, and wherein said ballast circuit means includes at least one reactance means having a voltage thereacross dependent upon the current through said gas discharge lamp, the improvement comprising an incandescent lamp, relay means having an energizing coil and normally closed contact means, means connecting said coil in parallel with said reactance means, the DC resistance and AC impedance of said coil being high with respect to the impedance of said reactance means, and means for energizing said incandescent lamp by way of said normally closed contact means, whereby said incandescent lamp is energized when said gas discharge lamp is extinguished.
Claim 2
Dependent Claim
135 words
In a gas discharge lamplighting circuit of the type comprising a gas discharge lamp, a source of energizing power for said lamp, and ballast circuit means for energizing said gas discharge lamp form said source, and wherein said ballast circuit means includes at least one reactance means having a voltage thereacross dependent upon the current through said gas discharge lamp, the improvement comprising an incandescent lamp, relay means having an energizing coil and normally closed contact means, means connecting said coil in parallel with said reactance means, the DC resistance and AC impedance of said coil being high with respect to the impedance of said reactance means, and means for energizing said incandescent lamp by way of said normally closed contact means, whereby said incandescent lamp is energized when said gas discharge lamp is extinguished.
Claim 3
Dependent Claim
42 words
The circuit of claim 1 wherein said source of power comprises first and second terminals, and said means for energizing an incandescent lamp comprises means connecting said incandescent lamp to said first and second terminals by way of said normally closed contacts.
Claim 4
Dependent Claim
44 words
The circuit of claim 1 wherein said means for energizing said incandescent lamp comprises a second source of power independent of said first source, and means connecting said incandescent lamp to said second source of power by way of said normally closed contact means.
Claim 5
Dependent Claim
31 words
The circuit of claim 1 wherein said reactance means comprises a capacitor connected in series with said gas discharge lamp and said relay coil is connected in parallel with said capacitor.
Claim 6
Dependent Claim
41 words
The circuit of claim 4 wherein said ballast circuit means further comprises an inductive means serially connected with said gas discharge lamp, and wherein said circuit further comprises autotransformer means connected between said source of power and said ballast circuit means.
Claim 7
Dependent Claim
39 words
The circuit of claim 1 wherein said means connecting said coil in parallel with said reactance means comprises a transformer having a primary winding connected in parallel with said reactance means, and a secondary winding connected to said coil.
Claim 8
Dependent Claim
47 words
The circuit of claim 1 wherein said ballast circuit means for energizing the gas discharge lamp from said source comprises a transformer having a primary winding connected to said source, and an isolated secondary winding connected in series with said gas discharge lamp and said reactance means.
References Cited (Backward Citations)
CH377937A
Cited
US3517254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |