US4505797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange membranes reinforced with non-woven carbon fibers
Assignee: Veolia WTS Systems USA Inc
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Filing: 1983-03-24
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Granted: 1985-03-19
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Expires: 2003-03-24
Abstract
Abstract This invention is directed to electrodialysis, electrochemical membrane cells and particularly to components comprising the ion-exchange membranes. These membranes are fabricated containing a reinforcing structure comprised of non-woven carbon fibers derived for example from carbonized polyacrylonitrile. The membranes so produced have a low D.C. electrical resistance (increased conductivity) which enables electrodialysis to be performed more economically.
Inventors
- 👤 Russell B. Hodgdon
- 👤 Warren A. Waite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:22
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/107; B01D69/1071; B01D71/00; B01D71/06; B01D71/40; B01D71/42; B01D71/421; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; B01D2323/00; B01D2323/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
35 words
An electrically conductive, cross-linked substantially hydraulically impermeable, polymeric ion-exchange selective resin membrane having embedded therein a reinforcing matrix or backing of a fabric structure; the improvement comprising a fabric consisting of non-woven, carbonized polyacrylonitrile fibers.
Claim 2
Dependent Claim
35 words
An electrically conductive, cross-linked substantially hydraulically impermeable, polymeric ion-exchange selective resin membrane having embedded therein a reinforcing matrix or backing of a fabric structure; the improvement comprising a fabric consisting of non-woven, carbonized polyacrylonitrile fibers.
Claim 3
Dependent Claim
32 words
The ion-exchange selective membrane of claim 1 having a multi-layered reinforcing structure comprised of a plurality of said fabric sheets arranged in substantially face to face relationship with respect to one another.
Claim 4
Independent Claim
57 words
The method of producing a reinforced highly conductive ion-exchange selective membrane comprising the steps of providing a reinforcing structure consisting of a non-woven, carbonized polyacrylonitrile fibrous fabric material, impregnating said fabric with an ion-exchange polymerizable resin liquid mix, and thereafter curing said liquid mix to produce a solid polymerized, low resistance, substantially hydraulically impermeable, ion-exchange selective membrane.
Claim 5
Independent Claim
57 words
The method of producing a reinforced highly conductive ion-exchange selective membrane comprising the steps of providing a reinforcing structure consisting of a non-woven, carbonized polyacrylonitrile fibrous fabric material, impregnating said fabric with an ion-exchange polymerizable resin liquid mix, and thereafter curing said liquid mix to produce a solid polymerized, low resistance, substantially hydraulically impermeable, ion-exchange selective membrane.
Claim 6
Dependent Claim
20 words
The method of claim 3 wherein a plurality of sheets of said carbonized fabric are employed as a reinforcing structure.
Claim 7
Dependent Claim
56 words
An electrochemical cell apparatus for transferring ions from one solution to another solution comprising liquid containing chambers separated by ion-permeable membranes and having terminal electrodes for passing a direct current transversely through said chambers and membranes, the improvement wherein at least some of said membranes have imbedded therein a reinforcing fabric of non-woven, carbonized polyacrylonitrile fibers.
Claim 8
Dependent Claim
56 words
An electrochemical cell apparatus for transferring ions from one solution to another solution comprising liquid containing chambers separated by ion-permeable membranes and having terminal electrodes for passing a direct current transversely through said chambers and membranes, the improvement wherein at least some of said membranes have imbedded therein a reinforcing fabric of non-woven, carbonized polyacrylonitrile fibers.
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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |