Patent US3235409A successfully refreshed from Google Patents.
US3235409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irradiated battery separator membranes
Assignee: Dow Chemical Co
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Filing: 1961-07-14
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Granted: 1966-02-15
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Expires: 1981-07-14
Abstract
No abstract record available.
Inventors
- 👤 Jr George K Greminger
- 👤 Garth H Beaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:21
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/429; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A PRIMARY GALVANIC DRY CELL COMPRISING A SOLUBLE METALLIC ANODE, AN INSOLUBLE CATHODS, A DEPOLARIZER MIX, AN ELECTROLYTE AND A SEPARATOR BETWEEN SAID SOLUBLE METALLIC ANODE AND SAID DEPLOARIZER MIX, SAID SEPARATOR BEING COMPOSED OF A WATER-INSOLUBLE, BIBULOUS MEMBRANE HAVING A THICKNESS FROM ABOUT 1 UP TO ABOUT 4 MILS PREPARED BY SUBJECTING A LAYER OF AN AQUEOUS SOL HAVING A PH WITHIN THE RANGE FROM ABOUT 2 TO ABOUT 8 AND CONTAINING FROM ABOUT 1 UP TO 50 PERCENT BY WEIGHT OF A HYDROXYALKYL METHYL CELLULOSE ETHER WHEREIN THE HYDROXYALKYL GROUP CONTAINS FROM 2 TO 4 CARBON ATOMS AND THE ETHER IS CHARACTERIZED BY A HYDROXYALKYL DEGREE OF SUBSTITUTION FOR EACH GLUCOSE RESIDUE MOIETY FROM ABOUT 0.05 TO ABOUT 0.5 AND METHYL DEGREE OF SUBSTITUTION FOR EACH GLUCOSE RESIDUE MOIETY FROM ABOUT 0.9 TO ABOUT 2 TO A DOSE OF HIGH ENERGY IONIZING RADIATION OF FROM ABOUT 0.25 UP TO 5 MEGARADS.
Claim 2
Dependent Claim
153 words
A PRIMARY GALVANIC DRY CELL COMPRISING A SOLUBLE METALLIC ANODE, AN INSOLUBLE CATHODS, A DEPOLARIZER MIX, AN ELECTROLYTE AND A SEPARATOR BETWEEN SAID SOLUBLE METALLIC ANODE AND SAID DEPLOARIZER MIX, SAID SEPARATOR BEING COMPOSED OF A WATER-INSOLUBLE, BIBULOUS MEMBRANE HAVING A THICKNESS FROM ABOUT 1 UP TO ABOUT 4 MILS PREPARED BY SUBJECTING A LAYER OF AN AQUEOUS SOL HAVING A PH WITHIN THE RANGE FROM ABOUT 2 TO ABOUT 8 AND CONTAINING FROM ABOUT 1 UP TO 50 PERCENT BY WEIGHT OF A HYDROXYALKYL METHYL CELLULOSE ETHER WHEREIN THE HYDROXYALKYL GROUP CONTAINS FROM 2 TO 4 CARBON ATOMS AND THE ETHER IS CHARACTERIZED BY A HYDROXYALKYL DEGREE OF SUBSTITUTION FOR EACH GLUCOSE RESIDUE MOIETY FROM ABOUT 0.05 TO ABOUT 0.5 AND METHYL DEGREE OF SUBSTITUTION FOR EACH GLUCOSE RESIDUE MOIETY FROM ABOUT 0.9 TO ABOUT 2 TO A DOSE OF HIGH ENERGY IONIZING RADIATION OF FROM ABOUT 0.25 UP TO 5 MEGARADS.
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |