US5089925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection device for electronic circuit
Assignee: Osram Sylvania Inc
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Filing: 1990-09-21
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Granted: 1992-02-18
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Expires: 2010-09-21
Abstract
Abstract A synchronized ballast for a discharge lamp having an increased dimming range. The ballast includes a combined overvoltage and reverse voltage protection device for an electronic circuit operable from a direct current supply is disclosed.
Inventors
- 👤 James N. Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:23
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921; H05B41/3927; H05B41/26; H05B41/28; H05B41/295; H05B41/298
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A combined overvoltage and reverse voltage protection device comprising: first and second direct current input terminals; a relay having a coil and a normally-closed switch; a semiconductor device connected in series with said coil, the series connection of said coil and said semiconductor device being coupled across said first and second direct current input terminals; one end of said normally-closed switch being coupled to said first direct current input terminal, the other end of said normally-closed switch adapted to be coupled to an electronic circuit, said normally-closed switch being operative to interrupt power to the electronic circuit in response to an overvoltage or a reverse voltage detected at said first and second direct current input terminals.
Claim 2
Dependent Claim
116 words
A combined overvoltage and reverse voltage protection device comprising: first and second direct current input terminals; a relay having a coil and a normally-closed switch; a semiconductor device connected in series with said coil, the series connection of said coil and said semiconductor device being coupled across said first and second direct current input terminals; one end of said normally-closed switch being coupled to said first direct current input terminal, the other end of said normally-closed switch adapted to be coupled to an electronic circuit, said normally-closed switch being operative to interrupt power to the electronic circuit in response to an overvoltage or a reverse voltage detected at said first and second direct current input terminals.
Claim 3
Dependent Claim
14 words
The protection device of claim 1 wherein said semiconductor device is a zener diode.
References Cited (Backward Citations)
US3450946A
Cited
US4087847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |