Patent US2673887A successfully refreshed from Google Patents.
US2673887A
Expired / Lapsed
US
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Manufacture of separators for electric batteries
Assignee: British Fibrak Separator Co Ltd
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Filing: 1949-03-16
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Granted: 1954-03-30
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Expires: 1969-03-16
Abstract
No abstract record available.
Inventors
- 👤 Booth Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:51
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; C04B26/10; C04B26/12; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/446; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A SEPARATOR FOR AN ELECTRIC ACCUMULATOR, COMPRISING A SHEET COMPOSED OF INTIMATELY MIXED GLASS FIBRES AND A CELLULOSE PAPER PULP, AND SUBSTANTIALLY 6% BY VOLUME OF A PHENOLIC RESIN WET STRENGTH AGENT INCORPORATED IN THE FIBRE AND PULP MIXTURE, THE GLASS FIBRES PREDOMINATING IN THE MIXTURE, SAID SHEET BEING SUBSEQUENTLY IMPREGNATED WITH AN ACID RESISTING PHENOLIC RESIN POLYMERISED AFTER THE IMPREGNATION AND BEING TREATED WITH A WETTING SOLUTION.
Claim 2
Dependent Claim
68 words
A SEPARATOR FOR AN ELECTRIC ACCUMULATOR, COMPRISING A SHEET COMPOSED OF INTIMATELY MIXED GLASS FIBRES AND A CELLULOSE PAPER PULP, AND SUBSTANTIALLY 6% BY VOLUME OF A PHENOLIC RESIN WET STRENGTH AGENT INCORPORATED IN THE FIBRE AND PULP MIXTURE, THE GLASS FIBRES PREDOMINATING IN THE MIXTURE, SAID SHEET BEING SUBSEQUENTLY IMPREGNATED WITH AN ACID RESISTING PHENOLIC RESIN POLYMERISED AFTER THE IMPREGNATION AND BEING TREATED WITH A WETTING SOLUTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |