Patent US4891561A successfully refreshed from Google Patents.
US4891561A
Expired / Lapsed
US
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Neon tube lighting device
Assignee: Metalaser Pty Ltd
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Filing: 1988-03-09
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Granted: 1990-01-02
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Expires: 2008-03-09
Abstract
Abstract A neon tube lighting device comprises a resonance circuit, formed by a capacitor and the primary winding of a leakage transformer, which is connected across a DC power supply via a switching element, the ON-OFF operation of which is controlled by the output signal of a signal generator. The output signal provided by the signal generator has a constant frequency substantially equal to the resonance frequency of the resonance circuit. A neon tube is connected to the secondary winding of the leakage transformer.
Inventors
- 👤 Shintetsu Amano
- 👤 Yoshinori Mizuhata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:12
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; H05B41/2822; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A neon tube lighting device comprising: a leakage transformer having at least a primary winding and a secondary winding; a resonance capacitor connected across the primary winding of said leakage transformer, said capacitor and primary winding forming a resonance circuit; a switching element connected in series with said primary winding; a DC power supply connected across said series connected primary winding and switching element; and a signal generator which generates a signal and supplies the signal to said switching element for effecting ON-OFF control of said switching element, said signal having a constant frequency substantially equal to the resonance frequency of said resonance circuit.
Claim 2
Dependent Claim
104 words
A neon tube lighting device comprising: a leakage transformer having at least a primary winding and a secondary winding; a resonance capacitor connected across the primary winding of said leakage transformer, said capacitor and primary winding forming a resonance circuit; a switching element connected in series with said primary winding; a DC power supply connected across said series connected primary winding and switching element; and a signal generator which generates a signal and supplies the signal to said switching element for effecting ON-OFF control of said switching element, said signal having a constant frequency substantially equal to the resonance frequency of said resonance circuit.
Claim 3
Dependent Claim
40 words
The neon tube lighting device of claim 1 wherein said DC power supply comprises the commercial power source, a rectifier for full-wave rectifying the output of the commercial power source, and a capacitor connected to the output of the rectifier.
Claim 4
Dependent Claim
15 words
The neon tube lighting device of claim 1 wherein said switching element is an FET.
Claim 5
Dependent Claim
19 words
The neon tube lighting device of claim 3, wherein a protective circuit is connected in parallel to the FET.
Claim 6
Dependent Claim
17 words
The neon tube lighting device of claim 1, wherein said signal generator is a rectangular wave generator.
Claim 7
Dependent Claim
17 words
The neon tube lighting device of claim 2, wherein said signal generator is a rectangular wave generator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |