US3275575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation exchange membrane from a sulfated polyvinyl alcohol
Assignee: Honeywell International Inc
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Filing: 1962-04-17
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Granted: 1966-09-27
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Expires: 1982-04-17
Abstract
No abstract record available.
Inventors
- 👤 Merlyn W Fogle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:12
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; H; H01; H01M; H01M8/00; H01M8/10; H01M8/1016; H01M8/1018; H01M8/102; H01M8/1027; H01M8/103; H01M8/1069; H01M8/1086; H01M8/1088; H01M8/109; C08J2329/00; C08J2329/02; C08J2329/04; C08J2471/00; C08J2471/08; C08J2471/10; C08J2471/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A CATION EXCHANGE MEMBRANE COMPRISING A MIXTURE OF POLYVINYL ALCOHOL, DIGLYCIDYL ETHER OF GLYCERIN AND FLUOROBORIC ACID, FORMED AS A MEMBRANE AND HEAT CURED, AND THEREAFTER SULFATED IN A MIXTURE OF GLACIAL ACETIC ACID AND CHLOROSULFONIC ACID.
Claim 2
Dependent Claim
43 words
A CATION EXCHANGE MEMBRANE COMPRISING A MIXTURE OF POLYVINYL ALCOHOL IN WATER, DIGLYCIDYL ETHER OF GLYCERIN AND DIETHYLENE TRIAMINE, FORMING THE MIXTURE AS A MEMBRANE AND HEAT CURING, AND THEREAFTER SULFATING THE MEMBRANE IN A MIXTURE OF GLACIAL ACETIC ACID AND CHLOROSULFONIC ACID.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |