US2877136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separators for electrical storage batteries
Assignee: British Fibrak Separator Co Ltd
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Filing: 1955-05-16
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Granted: 1959-03-10
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Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Booth Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:34
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/429; H01M50/4295; H01M50/403; H01M50/44; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF MANUFACTURING SEPARATOR MATERIAL FOR USE IN MAKING SEPARATORS FOR ELECTRIC STORAGE BATTERIES FROM PAPER PULP, CHARACTERISED BY IMPREGNATING A PAPER SHEET WITH A LATEX SELECTED FROM THE GROUP CONSISTING OF POLYVINYL LATICES AND RUBBER LATEX TO THE EXTENT OF BETWEEN 5 TO 25%, DRYING THE IMPREGNATED SHEET, IMPREGNATING THE DRIED SHEET WITH AN AQUEOUS SOLUTION OF A WATER SOLUBLE RESIN SELECTED FROM THE GROUP CONSISTING OF WATER SOLUBLE PHENOL AND CRESOL RESINS TO GIVE A RESIN SOLIDS CONTENT OF 10 TO 30%, THE TOTAL SOLIDS LEFT IN THE SHEET AS A RESULT OF THE TWO IMPREGNATIONS BEING 35 TO 40% AND FINALLY DRYING THE DOUBLY IMPREGNATED SHEET TO A MOISTURE CONTENT OF APPROXIMATELY 5 TO 10%.
Claim 2
Independent Claim
119 words
A METHOD OF MANUFACTURING SEPARATOR MATERIAL FOR USE IN MAKING SEPARATORS FOR ELECTRIC STORAGE BATTERIES FROM PAPER PULP, CHARACTERISED BY IMPREGNATING A PAPER SHEET WITH A LATEX SELECTED FROM THE GROUP CONSISTING OF POLYVINYL LATICES AND RUBBER LATEX TO THE EXTENT OF BETWEEN 5 TO 25%, DRYING THE IMPREGNATED SHEET, IMPREGNATING THE DRIED SHEET WITH AN AQUEOUS SOLUTION OF A WATER SOLUBLE RESIN SELECTED FROM THE GROUP CONSISTING OF WATER SOLUBLE PHENOL AND CRESOL RESINS TO GIVE A RESIN SOLIDS CONTENT OF 10 TO 30%, THE TOTAL SOLIDS LEFT IN THE SHEET AS A RESULT OF THE TWO IMPREGNATIONS BEING 35 TO 40% AND FINALLY DRYING THE DOUBLY IMPREGNATED SHEET TO A MOISTURE CONTENT OF APPROXIMATELY 5 TO 10%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |