Patent US3556853A successfully refreshed from Google Patents.
US3556853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grid for lead-acid cell
Assignee: AT&T Inc
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Filing: 1969-06-05
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Granted: 1971-01-19
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Expires: 1989-06-05
Abstract
Abstract THE STRUCTURAL MEMBERS OR RIBS OF THE GRID FOR A LEADACID CELL ARE PROPORTIONED SO THAT THE RATIO OF SURFACE AREA TO CROSS-SECTION AREA IS SUBSTANTIALLY IDENTICAL FOR EACH MEMBER. THUS, THE GROWTH OF EACH MEMBER WITH AGING IS SUBSTANTIALLY IDENTICAL AND THE MEMBERS MAINTAIN GOOD CONTACT WITH THE ACTIVE MATERIAL BETWEEN THE MEMBERS WHEREBY THE CELL CHARGE CAPACITY IS MAINTAINED FOR MUCH LONGER PERIODS THAN CAN BE ATTAINED WITH PRESENT GRIDS.
Inventors
- 👤 Anthony G Cannone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/72; H01M4/73; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |