Patent US3413537A successfully refreshed from Google Patents.
US3413537A
Expired / Lapsed
US
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Constant current battery charger
Assignee: MERRILL E SMITH
•
Filing: 1965-01-21
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Granted: 1968-11-26
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Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 Robert L Sharp
- 👤 Merrill E Smith
- 👤 Embree Otis Dale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:11
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123759A
Cited
US3333176A
Cited
US3217225A
Cited
US3160805A
Cited
US3114872A
Cited
US3226623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |