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US3448239A
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Battery charging circuit
Assignee: Gregory Industries Inc
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Filing: 1966-04-06
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Granted: 1969-06-03
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Expires: 1986-04-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:03
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1183264A
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US1538588A
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US2354877A
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US2477622A
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US2650339A
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US2883579A
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US3106665A
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US3081426A
Cited
US3291958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |