Patent US4021327A successfully refreshed from Google Patents.
US4021327A
Expired / Lapsed
US
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Reinforced cation permeable separator
Assignee: EIDP Inc
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Filing: 1975-04-29
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Granted: 1977-05-03
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Expires: 1995-04-29
Abstract
Abstract A cation permeable separator containing a polymer with ion exchange sites is reinforced with supporting fibers introduced into a polymer matrix in a fabric which also contains sacrificial fibers that are subsequently removed. In electrolysis of brine, the use of this type of reinforced cation permeable separator positioned between anode and cathode compartments of an electrolytic cell has resulted in increased electrical efficiency and/or decreased voltage.
Inventors
- 👤 Walther Gustav Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:44
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; B32B27/30; B32B27/304; B32B27/32; B32B27/322; B32B5/00; B32B5/02; B32B5/08; C08J5/2275; C08J5/2281; B32B2260/00; B32B2260/02; B32B2260/021; B32B2262/00; B32B2262/02; B32B2262/0223; B32B2262/0238; B32B2262/06; B32B2262/062; B32B2309/00; B32B2309/02; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
83 words
A cation permeable separator substantially impervious to hydraulic flow of liquid comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as ion exchange sites, said sulfonyl groups being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said separator containing support fibers and containing voids which are formed by the removal of sacrificial fibers, said supporting fibers and sacrificial fibers initially comprising a fabric prior to formation of said voids.
Claim 2
Dependent Claim
83 words
A cation permeable separator substantially impervious to hydraulic flow of liquid comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as ion exchange sites, said sulfonyl groups being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said separator containing support fibers and containing voids which are formed by the removal of sacrificial fibers, said supporting fibers and sacrificial fibers initially comprising a fabric prior to formation of said voids.
Claim 3
Dependent Claim
13 words
The cation permeable separator of claim 1 wherein said fluorine-containing polymer is perfluorinated.
Claim 4
Dependent Claim
20 words
The cation permeable separator of claim 2 wherein said fluorine-containing polymer is a copolymer formed from tetrafluoroethylene and perfluoro(3,6-dioxa-4-methyl-7-octenesulfonyl fluoride).
Claim 5
Dependent Claim
15 words
The cation permeable separator of claim 1 wherein said support fibers comprise a perfluorinated polymer.
Claim 6
Dependent Claim
35 words
The cation permeable separator of claim 4 where said perfluorinated polymer is made from one or more monomers selected from tetrafluoroethylene, hexafluoropropylene and perfluoro(alkyl vinyl ether) with an alkyl of 1 to 10 carbon atoms.
Claim 7
Dependent Claim
22 words
The cation permeable separator of claim 1 in the form of a film with a thickness of no more than 30 mils.
Claim 8
Dependent Claim
16 words
The cation permeable separator of claim 6 wherein said thickness is no more than 20 mils.
Claim 9
Dependent Claim
16 words
The cation permeable separator of claim 7 wherein said thickness is no more than 12 mils.
Claim 10
Dependent Claim
59 words
A cation permeable separator comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as ion exchange sites, said sulfonyl groups present as ion exchange sites being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said separator containing a fabric comprising supporting fibers and sacrificial fibers.
Claim 11
Dependent Claim
59 words
A cation permeable separator comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as ion exchange sites, said sulfonyl groups present as ion exchange sites being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said separator containing a fabric comprising supporting fibers and sacrificial fibers.
Claim 12
Dependent Claim
58 words
A film comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as --SO 2 X with X defining chlorine or fluorine, said sulfonyl groups being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said film containing a fabric comprising supporting fibers and sacrificial fibers.
Claim 13
Dependent Claim
58 words
A film comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as --SO 2 X with X defining chlorine or fluorine, said sulfonyl groups being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said film containing a fabric comprising supporting fibers and sacrificial fibers.
Claim 14
Dependent Claim
9 words
The film of claim 10 where X defines fluorine.
Claim 15
Dependent Claim
84 words
A microporous cation permeable separator capable of allowing hydraulic flow of liquid comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as ion exchange sites, said sulfonyl groups being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said separator containing supporting fibers and containing voids which are formed by the removal of sacrificial fibers, said supporting fibers and sacrificial fibers initially comprising a fabric prior to formation of said voids.
Claim 16
Dependent Claim
84 words
A microporous cation permeable separator capable of allowing hydraulic flow of liquid comprising a fluorine-containing polymer with a plurality of sulfonyl groups present as ion exchange sites, said sulfonyl groups being contained in side chains and being attached to individual carbon atoms to which are attached at least one fluorine atom, said separator containing supporting fibers and containing voids which are formed by the removal of sacrificial fibers, said supporting fibers and sacrificial fibers initially comprising a fabric prior to formation of said voids.
Claim 17
Dependent Claim
13 words
The cation permeable separator of claim 12 wherein said fluorine-containing polymer is perfluorinated.
Claim 18
Dependent Claim
20 words
The cation permeable separator of claim 13 wherein said fluorine-containing polymer is a copolymer formed from tetrafluoroethylene and perfluoro(3,6-dioxa-4-methyl-7-octenesulfonyl fluoride).
Claim 19
Dependent Claim
15 words
The cation permeable separator of claim 12 wherein said support fibers comprise a perfluorinated polymer.
Claim 20
Dependent Claim
35 words
The cation permeable separator of claim 15 where said perfluorinated polymer is made from one or more monomers selected from tetrafluoroethylene, hexafluoropropylene and perfluoro(alkyl vinyl ether) with an alkyl of 1 to 10 carbon atoms.
Claim 21
Dependent Claim
22 words
The cation permeable separator of claim 12 in the form of a film with a thickness of no more than 30 mils.
Claim 22
Dependent Claim
16 words
The cation permeable separator of claim 17 wherein said thickness is no more than 20 mils.
Claim 23
Dependent Claim
16 words
The cation permeable separator of claim 18 wherein said thickness is not more than 12 mils.
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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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |