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US5232598A
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Porous inorganic membranes
Assignee: Societe des Ceramiques Techniques SA
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Filing: 1990-10-12
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Granted: 1993-08-03
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Expires: 2010-10-12
Abstract
Abstract A composite membrane for microfiltration comprises a woven metal mesh support and films bridging the interstices comprising inorganic particles, e.g. zirconia, bonded together by 1-25% of an inorganic adhesive. Group IV metal e.g. Si or Zr phosphate adhesives are preferred. Low temperature film formation without sintering permits the use of non-refractory metal supports.
Inventors
- 👤 Michael P. Thomas
- 👤 Andrew J. Sturgeon
- 👤 Nigel I. Steward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0048; B01D67/0046; B01D71/00; B01D71/02; C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306; C04B35/6316; B01D2323/00; B01D2323/08; B01D2323/081; B01D2323/12; B01D2323/15; B01D2323/218; B01D2323/2181
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
67 words
A composite membrane comprising a support having interstices of diameter greater than 5 μm and length less than ten times their diameters, and porous inorganic films carried by the support and bridging the interstices thereof, wherein the films comprise more than 50% by weight of particles of an inorganic material bonded together by means alternative to sintering, comprising less than 50% by weight of an inorganic adhesive.
Claim 2
Dependent Claim
67 words
A composite membrane comprising a support having interstices of diameter greater than 5 μm and length less than ten times their diameters, and porous inorganic films carried by the support and bridging the interstices thereof, wherein the films comprise more than 50% by weight of particles of an inorganic material bonded together by means alternative to sintering, comprising less than 50% by weight of an inorganic adhesive.
Claim 3
Dependent Claim
13 words
The composite membrane as defined in claim 1, wherein the support is inorganic.
Claim 4
Dependent Claim
18 words
The composite membrane as defined in claim 2, wherein the films are of substantially coplanar with the support.
Claim 5
Dependent Claim
30 words
The composite membrane as defined in claim 2, wherein the films comprise from 75 to 99% of the particles bonded together by means of 1 to 25% of the adhesive.
Claim 6
Dependent Claim
15 words
The composite membrane as defined in claim 2, wherein the inorganic adhesive is phosphate based.
Claim 7
Dependent Claim
19 words
The composite membrane as defined in claim 2, wherein the inorganic adhesive is based on a group IV phosphate.
Claim 8
Dependent Claim
18 words
The composite membrane as defined in claim 2, wherein the particles and the adhesive have a common cation.
Claim 9
Dependent Claim
15 words
The composite membrane as defined in claim 2, wherein the inorganic adhesive is silicate based.
Claim 10
Dependent Claim
18 words
The composite membrane as defined in claim 1, wherein the films are of substantially coplanar with the support.
Claim 11
Dependent Claim
15 words
The composite membrane as defined in claim 9, wherein the inorganic adhesive is phosphate based.
Claim 12
Dependent Claim
19 words
The composite membrane as defined in claim 9, wherein the inorganic adhesive is based on a group IV phosphate.
Claim 13
Dependent Claim
15 words
The composite membrane as defined in claim 1, wherein the support is a woven metal.
Claim 14
Dependent Claim
15 words
The composite membrane as defined in claim 1, wherein the inorganic adhesive is phosphate based.
Claim 15
Dependent Claim
30 words
The composite membrane as defined in claim 1, wherein the films comprise from 75 to 99% of the particles bonded together by means of 1 to 25% of the adhesive.
Claim 16
Dependent Claim
23 words
The composite membrane as defined in claim 1, wherein the particles have an average diameter in the range of 0.1 to 50 μm.
Claim 17
Dependent Claim
15 words
The composite membrane as defined in claim 1, wherein the inorganic adhesive is phosphate based.
Claim 18
Dependent Claim
19 words
The composite membrane as defined in claim 1, wherein the inorganic adhesive is based on a group IV phosphate.
Claim 19
Dependent Claim
18 words
The composite membrane as defined in claim 1, wherein the particles and the adhesive have a common cation.
Claim 20
Dependent Claim
15 words
The composite membrane as defined in claim 1, wherein the inorganic adhesive is silicate based.
Claim 21
Dependent Claim
15 words
The composite membrane as defined in claim 1, wherein the inorganic adhesive is silicate based.
References Cited (Backward Citations)
GB1509401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |