US3746961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charging circuit
Assignee: Ronson Corp
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Filing: 1972-09-14
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Granted: 1973-07-17
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Expires: 1992-09-14
Abstract
Abstract A battery charger for recharging a rechargeable battery cell wherein an indication is given as to whether charging current is being drawn. In the charging circuit a capacitor and a rectifying arrangement are connected in series across an ac source and a neon tube and capacitor are connected across the capacitor. With this arrangement the neon tube is illuminated when a charging current is drawn and is not illuminated at other times.
Inventors
- 👤 A Dobie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/02; H02J7/60; H02J7/64; H02J7/80; Y; Y10; Y10S; Y10S320/00; Y10S320/18; Y10S320/21; Y10S320/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A battery charging circuit for charging a rechargeable battery cell comprising: terminals for connection to an AC power supply, a first capacitor and a rectifying arrangement connected in series across said AC power supply terminals, DC output terminals connected across said rectifying arrangement for supplying direct current to a battery cell to be charged, and a series combination of a second capacitor and a discharge illuminating tube connected across said first capacitor whereby said rectifying arrangement impresses an alternating current across said second capacitor and said illumination tube when charging current to said battery cell is drawn thereby to illuminate said tube to provide a visible indication that charging of said cell is occurring.
Claim 2
Dependent Claim
114 words
A battery charging circuit for charging a rechargeable battery cell comprising: terminals for connection to an AC power supply, a first capacitor and a rectifying arrangement connected in series across said AC power supply terminals, DC output terminals connected across said rectifying arrangement for supplying direct current to a battery cell to be charged, and a series combination of a second capacitor and a discharge illuminating tube connected across said first capacitor whereby said rectifying arrangement impresses an alternating current across said second capacitor and said illumination tube when charging current to said battery cell is drawn thereby to illuminate said tube to provide a visible indication that charging of said cell is occurring.
Claim 3
Dependent Claim
50 words
A circuit as defined in claim 1 wherein said rectifier arrangement comprises a half-wave rectifier including two diodes, a first diode being connected in series with said DC output terminals and the second of said diodes connected across the series combination of the first diode and said DC output terminals.
Claim 4
Dependent Claim
81 words
A circuit as defined in claim 2 wherein a series combination of a resistor and a third capacitor are connected across the series combination of said second capacitor and said discharge illumination tube with the junction of said third capacitor and said resistor connected to the junction of said second caPacitor and said tube to provide a relaxation oscillator arrangement which intermittently illuminates said tube when no charging current is drawn but when said circuit is connected to said AC supply.
Claim 5
Dependent Claim
31 words
A battery charging circuit as defined in claim 1 including a high value discharge resistor connected across said first capacitor to discharge said first capacitor when said circuit is switched off.
Claim 6
Dependent Claim
30 words
A circuit as defined in claim 1 wherein said rectifier arrangement comprises a full-wave rectifier including four diodes arranged as a bridge full-wave rectifier connected across said DC output terminals.
Claim 7
Dependent Claim
102 words
A circuit as defined in claim 5 wherein a series combination of a resistor and a third capacitor are connected across the series combination of said second capacitor and said discharge illumination tube with the junction of said third capacitor and said resistor connected to the junction of said second capacitor and said tube to provide a relaxation oscillator arrangement and a second resistor connected across one of the diodes of said full-wave rectifier bridge to provide a leakage resistor whereby said illumination tube intermittently illuminates when no charging current is drawn but when said circuit is connected to said AC supply.
Claim 8
Dependent Claim
30 words
A charging circuit as defined in claim 5 including a high value discharge resistor connected across said first capacitor to discharge said first capacitor when said circuit is switched off.
Claim 9
Dependent Claim
17 words
A charging circuit as defined in claim 1 wherein said discharge illumination tube is a neon tube.
References Cited (Backward Citations)
US2898539A
Cited
US3539898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |