Patent US1936391A successfully refreshed from Google Patents.
US3477009A
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US
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Battery charging circuit
Assignee: Whirlpool Corp
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Filing: 1966-12-02
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Granted: 1969-11-04
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Expires: 1986-12-02
Abstract
No abstract record available.
Inventors
- 👤 Duane C Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:29
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/933; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S320/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2509252A
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US2578027A
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US2957117A
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US3005943A
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US2978633A
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US3241029A
Cited
US3281639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |