US2631180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric battery
Assignee: Sprague Electric Co
•
Filing: 1951-07-31
•
Granted: 1953-03-10
•
Expires: 1971-07-31
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:50
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/42; H01M6/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US690770A
Cited
US2001978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |