US3586539A
Expired / Lapsed
US
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Lead accumulator with dry storage stable charged electrode plates
Assignee: VARTA AG
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Filing: 1969-08-21
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Granted: 1971-06-22
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Expires: 1989-08-21
Abstract
Abstract LEAD ACCUMULATORS WITH DRY, STORAGE STABLE, CHARGED ELECTRODE PLATES, THE HOUSING OF WHICH CONTAINS CONCENTRATED SULFURIC ACID AND WHICH IS FILLED WITH WATER FOR ACTIVATION, WHEREIN THE SULFURIC ACID IS PRESENT AS A GEL OF ACYRLIC ACID, METHACRYLIC ACID, OR ACRYLAMIDE AND A CROSSLINKING COMPOUND.
Inventors
- 👤 Helmut Lauck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:41
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/06; H01M10/08; H01M10/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |