US5342431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal oxide membranes for gas separation
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1992-12-07
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Granted: 1994-08-30
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Expires: 2012-12-07
Abstract
Abstract A method for permformation of a microporous ceramic membrane onto a porous support includes placing a colloidal suspension of metal oxide particles on one side of the porous support and exposing the other side of the porous support to a drying stream of gas or a reactive gas stream so that the particles are deposited on the drying side of the support as a gel. The gel so deposited can be sintered to form a supported ceramic membrane having mean pore sizes less than 30 Angstroms and useful for ultrafiltration, reverse osmosis, or gas separation.
Inventors
- 👤 Marc A. Anderson
- 👤 Elizabeth T. Webster
- 👤 Qunyin Xu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:50
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D67/0039; B01D67/0041; B01D67/00411; B01D67/0048; B01D71/00; B01D71/02; B01D71/024; B01J; B01J19/00; B01J19/24; B01J19/2475; B01J35/00; B01J35/50; B01J35/58; B01J35/59; B01J37/00; B01J37/02; B01J37/0201; B01J37/0211; B01J8/00; B01J8/008; B01J8/009; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/486; C04B35/49; C04B35/622; C04B35/624; C04B41/00; C04B41/45; C04B41/4505; C04B41/4535; C04B41/4537; C04B41/80; C04B41/81; B01D2323/00; B01D2323/12; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00548; B01J2208/00557; B01J2208/00575; B01J2208/00592; B01J2208/0061; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00164; B01J2219/00177
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A process for separating gases, comprising the steps of: (a) providing a microporous metal oxide ceramic membrane performed in the pores of a porous support and having pores averaging less than 40 Angstroms in diameter; (b) exposing a mixture of gases of various molecular size and shape against one side of the permformed microporous ceramic membrane under conditions which favor the flow of gases through the membrane; (c) excluding one or more species of gas from passage through the membrane because of the size of the pores of the microporous ceramic membrane; and (d) recovering at least one partially purified gas which has passed through the membrane.
Claim 2
Dependent Claim
107 words
A process for separating gases, comprising the steps of: (a) providing a microporous metal oxide ceramic membrane performed in the pores of a porous support and having pores averaging less than 40 Angstroms in diameter; (b) exposing a mixture of gases of various molecular size and shape against one side of the permformed microporous ceramic membrane under conditions which favor the flow of gases through the membrane; (c) excluding one or more species of gas from passage through the membrane because of the size of the pores of the microporous ceramic membrane; and (d) recovering at least one partially purified gas which has passed through the membrane.
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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) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-29 | 2002-02-28 | 2002-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-29 | 2006-02-28 | 2006-08-30 | $7700.00 | Window Closed / Lapsed |