US3573994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid permeable liquid absorbent porous sheet materials
Assignee: Alkaline Batteries Ltd
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Filing: 1968-01-31
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Granted: 1971-04-06
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Expires: 1988-01-31
Abstract
Abstract A MATERIAL SUITABLE FOR USE IN SEPARATORS FOR THE PLATES OF ALKALINE STORAGE BATTERIES IS MADE BY SINTERING A FELT CONTAINING ABOUT 90% FIBRE AND 10% POWDER, OF WHICH ABOUT HALF THE FIBRE IS NYLON STAPLE AND ABOUT HALF REGENERATED CELLULOSE, AND OF WHICH ABOUT A THIRD OF THE POWDER IS POWDERED NYLON, THE REMAINDER BEING CELLULOSE POWDER AND INERT FILLER POWDER.
Inventors
- 👤 Braham Rowley Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:51
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/411; H01M50/429; H01M2300/00; H01M2300/0002; H01M2300/0014; H01M50/4295; 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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |