US2821677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charging system
Assignee: Individual
•
Filing: 1956-08-14
•
Granted: 1958-01-28
•
Expires: 1976-08-14
Abstract
No abstract record available.
Inventors
- 👤 Milton A Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:04
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/60; H02J7/61; Y; Y10; Y10S; Y10S320/00; Y10S320/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1297857A
Cited
US1386972A
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US1360592A
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US1457863A
Cited
US1662366A
Cited
US1874374A
Cited
US2541935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |