Patent US3090904A successfully refreshed from Google Patents.
US3090904A
Expired / Lapsed
US
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Battery charger
Assignee: C and D Batteries Inc
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Filing: 1959-01-12
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Granted: 1963-05-21
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Expires: 1979-01-12
Abstract
No abstract record available.
Inventors
- 👤 Henry E Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:15
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/02; H02J2207/00; H02J2207/20; Y; Y10; Y10S; Y10S320/00; Y10S320/17; Y10S320/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
IN A BATTERY CHARGER, A POWER SOURCE, A TRANSFORMER ENERGIZED FROM SAID POWER SOURCE AND HAVING A RESONANT CIRCUIT AS PART THEREOF INCLUDING A WINDING AND A CAPACITOR, AN OUTPUT WINDING MAGNETICALLY COUPLED TO SAID WINDING OF SAID RESONANT CIRCUIT ADAPTED FOR ELECTRICAL CONNECTION WITH A BATTERY TO BE CHARGED, MEANS FOR CHANGING THE RESONANCE OF SAID RESONANT CIRCUIT THROUGH A CHANGE IN THE CAPACITY THEREOF WHEREBY TO INCREASE THE VOLTAGE OUTPUT OF SAID CIRCUIT AND THEREFORE THE CHARGING RATE OF SAID BATTERY, AND A TIMER FOR CONTROLLING SAID RESONANCE CHANGING MEANS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |