US2487831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery with concentric cells
Assignee: National Battery Co
•
Filing: 1944-10-17
•
Granted: 1949-11-15
•
Expires: 1964-10-17
Abstract
No abstract record available.
Inventors
- 👤 John L Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:45
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/04; H01M10/0422; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US614012A
Cited
US1173651A
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US1525759A
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US1622230A
Cited
US1883971A
Cited
US2061899A
Cited
US2185829A
Cited
US2361533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |