US4692354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing ceramic membrane for separation of condensed component
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1986-08-12
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Granted: 1987-09-08
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Expires: 2006-08-12
Abstract
Abstract A method for preparing a ceramic membrane for the separation of a condensed component which is characterized by comprising the steps of impregnating pores of a ceramic porous material with an alumina sol produced by hydrolyzing an aluminum alcoholate or an aluminum chelate; immersing the ceramic porous material into an aqueous sodium silicate solution; and subjecting the ceramic porous material to a water vapor treatment in a high-temperature water vapor.
Inventors
- 👤 Masashi Asaeda
- 👤 Kazutaka Mori
- 👤 Hiroshi Makihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:54
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/89; B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0048; B01D71/00; B01D71/02; B01D71/05; C04B41/009; C04B41/45; C04B41/52; B01D2323/00; B01D2323/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A method for preparing a ceramic membrane for the separation of a condensed component which is characterized by comprising the steps of impregnating pores of a ceramic porous material with an alumina sol produced by hydrolyzing an aluminum alcoholate or an aluminum chelate; immersing said ceramic porous material into an aqueous sodium silicate solution; and subjecting said ceramic porous material to a water vapor treatment in a high temperature water vapor.
Claim 2
Independent Claim
71 words
A method for preparing a ceramic membrane for the separation of a condensed component which is characterized by comprising the steps of impregnating pores of a ceramic porous material with an alumina sol produced by hydrolyzing an aluminum alcoholate or an aluminum chelate; immersing said ceramic porous material into an aqueous sodium silicate solution; and subjecting said ceramic porous material to a water vapor treatment in a high temperature water vapor.
Claim 3
Dependent Claim
82 words
A method for preparing ceramic membrane for the separation of a condensed component according to claim 1 which is characterized by comprising the steps of impregnating pores of a ceramic porous material with an alumina sol produced by hydrolyzing an aluminum alcoholate or an aluminum chelate; immersing said ceramic porous material into a 0.01 to 0.5 mol/l aqueous sodium silicate solution; and subjecting said ceramic porous material to a water vapor treatment at 95° to 100° C. for 0.5 to 5 hours.
Claim 4
Dependent Claim
40 words
A method according to claim 1 wherein said ceramic porous material is an optionally shaped porous material having relatively large pores (a pore diameter of which usually is 1,000 Å or more) such as foamed silica, sintered alumina or mullite.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein said aluminum alcoholate is at least one compound selected from aluminum isopropoxide and aluminum-2-butyrate.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein said aluminum chelate is at least one compound selected from aluminum tris(ethylacetoacetate) and ethylacetoacetate-aluminum-diisopropylate.
Claim 7
Dependent Claim
30 words
A method according to claim 2 wherein after said water vapor treatment, said ceramic porous material is immersed into boiling water in order to wash and remove alkaline components therefrom.
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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) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |