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Patent US3852135A successfully refreshed from Google Patents.
US3852135A
Expired / Lapsed
US
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Patching damaged cation-active permselective diaphragms
Assignee: Hooker Chemical Corp
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Filing: 1973-08-09
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Granted: 1974-12-03
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Expires: 1993-08-09
Abstract
Abstract A method is disclosed for patching cation-active permselective diaphragm material consisting essentially of a hydrolyzed copolymer of a perfluorinated hydrocarbon and a fluorosulfonated perfluorovinyl ether.
Inventors
- 👤 E Cook
- 👤 A Emery
- 👤 B Schoepfle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:41
CPC Classifications
B; B01; B01D; B01D65/00; B01D65/10; B01D65/106; B01D65/108; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
A PROCESS FOR REPAIRING DAMAGED SECTIONS OF A HYDROLYZED COPOLYMER OF A PERFLUORINATED HYDROCARBON CONTAINING FROM TWO TO FIVE CARBON ATOMS AND A FLUOROSULFONATED PERFLUOROVINVLETHER WHICH COMPRISES A. FORMING A SOLUTION OF A SECOND HYDROLYZED COPOLYMER OF A PERFLUORINATED HYDROCARBON CONTAINING FROM 2 TO 5 CARBON ATOMS AND A FLUOROSULFONATED PERFLUOROVINYL ETHER, SAID SECOND COPOLYMER HAVING A LOWER EQUIVALENT WEIGHT THAN SAID DAMAGED COPOLYMER IN A LOWER HYDROCARBON ALKANOL, B. WETTING THE AREA ADJACENT TO THE DAMAGED AREA OF THE DAMAGED COPOLYMER, C. COVERING THE WETTED AREA WITH A PATH OF HYDROLYZED COPOLYMER OF THE SAME EQUIVALENT WEIGHT AS THAT OF SAID DAMAGE COPOLYMER AND D. REMOVING THE LOWER ALKANOL SOLVENT FROM THE COVERED AREA.
Claim 2
Dependent Claim
115 words
A PROCESS FOR REPAIRING DAMAGED SECTIONS OF A HYDROLYZED COPOLYMER OF A PERFLUORINATED HYDROCARBON CONTAINING FROM TWO TO FIVE CARBON ATOMS AND A FLUOROSULFONATED PERFLUOROVINVLETHER WHICH COMPRISES A. FORMING A SOLUTION OF A SECOND HYDROLYZED COPOLYMER OF A PERFLUORINATED HYDROCARBON CONTAINING FROM 2 TO 5 CARBON ATOMS AND A FLUOROSULFONATED PERFLUOROVINYL ETHER, SAID SECOND COPOLYMER HAVING A LOWER EQUIVALENT WEIGHT THAN SAID DAMAGED COPOLYMER IN A LOWER HYDROCARBON ALKANOL, B. WETTING THE AREA ADJACENT TO THE DAMAGED AREA OF THE DAMAGED COPOLYMER, C. COVERING THE WETTED AREA WITH A PATH OF HYDROLYZED COPOLYMER OF THE SAME EQUIVALENT WEIGHT AS THAT OF SAID DAMAGE COPOLYMER AND D. REMOVING THE LOWER ALKANOL SOLVENT FROM THE COVERED AREA.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said perfluorinated hydrocarbon contains from two to four carbon atoms.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein said perfluorinated hydrocarbon contains from two to three carbon atoms.
Claim 5
Dependent Claim
65 words
The process of claim 1 wherein said hydrolyzed copolymer of said damaged section is a copolymer of tetrafluoroethylene and a fluorosulfonated perfluorovinyl ether of the formula FSO2CF2CF2OCF(CF3)CF2OCF CF2 said copolymer having an equivalent weight of from about 1,000 to about 1,600 and said second hydrolyzed copolymer is a copolymer of the same reactants but has an equivalent weight of from about 900 to about 1,000.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein the damaged copolymer has an equivalent weight of about 1,100 to about 1,400.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein said alkanol contains from one to four carbon atoms.
Claim 8
Dependent Claim
10 words
The process of claim 6 wherein said alkanol is ethanol.
Claim 9
Dependent Claim
10 words
The process of claim 6 wherein said alkanol is isopropanol.
Claim 10
Dependent Claim
24 words
The process of claim 6 wherein said alkanol solution contains from about 10 to about 20 percent by weight of said second hydrolyzed copolymer.
Claim 11
Dependent Claim
18 words
The process of claim 9 wherein said alkanol solution contains about fifteen percent by weight of said copolymer.
Claim 12
Dependent Claim
18 words
The process of claim 9 wherein said alkanol solution contains about ten percent by weight of said copolymer.
Claim 13
Dependent Claim
25 words
The process of claim 1 wherein said patch is also wetted with the solution of said second copolymer prior to covering the damaged area therewith.
Claim 14
Dependent Claim
32 words
The process of claim 12 wherein the side of the patch which is to be placed in contact with the damaged area of copolymer is wetted with the solution of the copolymer.
References Cited (Backward Citations)
US3713926A
Cited
US3804685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |