US3735559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonated polyxylylene oxide as a permselective membrane for water vapor transport
Assignee: General Electric Co
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Filing: 1972-02-02
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Granted: 1973-05-29
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Expires: 1992-02-02
Abstract
Abstract Sulfonated polyxylylene oxide membranes are very effective for the separation of water vapor from other gases. Such a gas separation is very selective and may be readily accomplished at atmospheric pressure. Membrane devices for humidifying or drying an air stream are described.
Inventors
- 👤 R Salemme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:12
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D53/00; B01D53/26; B01D53/268; C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485; F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F2003/1435; F24F6/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
11 words
The process of claim 1 wherein the membrane has been pre-shrunk.
Claim 2
Dependent Claim
30 words
The process of claim 1 wherein the transmembraNe gradient in water vapor is maintained by the use of a dry sweep gas flow over the downstream side of the membrane.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the membrane is a sodium counter ion membrane.
Claim 4
Dependent Claim
176 words
Apparatus for altering the composition of a gas mixture comprising in combination: a. a plurality of spaced, flat longitudinally extending plates with major flat surfaces thereof disposed in juxtaposition, b. at least one thin, nonporous permeable membrane, said at least one membrane being disposed between and spaced from two of said plates, c. means extending around the periphery of said at least one membrane for sealing and fixing the dimension of separate gas passages extending on each side of said at least one membrane between said plates and the membrane disposed therebetweeen, d. each of said plates having a pair of spaced manifold systems, one manifold system being located adjacent opposite ends of said at least one membrane, each manifold system consisting of a cylindrical recess extending internally of said plate in a direction substantially parallel to said flat surfaces and a series of small, closely-spaced ports extending from said cylindrical recess to any gas passage contiguous to said plate and e. means connected to each of said cylindrical recesses for establishing gas flow communication therewith.
Claim 5
Dependent Claim
32 words
The apparatus as recited in claim 5 wherein the at least one membrane is made of a material selected from the group consisting of sulfonated polyxylylene oxide and sulfonated 2,6-diphenyl polyphenylene oxide.
Claim 6
Dependent Claim
33 words
The apparatus as recited in claim 5 wherein two separate sets of gas passages are employed, each set of passages comprising a plurality of separate gas passages in flow communication with each other.
Claim 7
Dependent Claim
23 words
The apparatus as recited in claim 7 wherein the passages in each set of passages are connected for series flow of gas therethrough.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |