Patent EP0489094A1 successfully refreshed from Google Patents.
Patent US5391364A successfully refreshed from Google Patents.
US5391364A
Expired / Lapsed
US
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Inorganic oxide aerogel microbeads of narrow pore diameter distribution and the method for their preparation
Assignee: Enichem Partecipazioni SpA
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Filing: 1991-04-24
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Granted: 1995-02-21
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Expires: 2011-04-24
Abstract
Abstract Microbeads of aerogels of one or more oxides are characterised by a high porosity and the fact that at least 90% of the pores present have a diameter lying within a very narrow range. The surface area exceeds 300 m 2 /g and more frequently exceeds 500 m 2 /g, the total pore volume exceeding 1 ml/g.
Inventors
- 👤 Guido Cogliati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:46
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/32; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
Microbeads of aerogels of one or more oxides selected from those of metals of Groups II to VI, VIIB and VIII of the Periodic Table and of silicon and characterised by a surface area exceeding 300 m 2 /g, a total pore volume exceeding 1 ml/g, and at least 90% of the pores present have a diameter lying between 50 and 1000 Å, the difference between the maximum and minimum of this range never exceeding 50 Å.
Claim 2
Dependent Claim
77 words
Microbeads of aerogels of one or more oxides selected from those of metals of Groups II to VI, VIIB and VIII of the Periodic Table and of silicon and characterised by a surface area exceeding 300 m 2 /g, a total pore volume exceeding 1 ml/g, and at least 90% of the pores present have a diameter lying between 50 and 1000 Å, the difference between the maximum and minimum of this range never exceeding 50 Å.
Claim 3
Dependent Claim
29 words
Aerogel microbeads as claimed in the preceding claim, wherein the oxide metal is chosen as one or more from Al, Si, Ti, B, La, Zr, Cr, Sn and Mg.
Claim 4
Dependent Claim
14 words
Aerogel microbeads as claimed in claim 1, wherein the oxide is SiO 2 .
Claim 5
Dependent Claim
17 words
Aerogel microbeads as claimed in claim 2, wherein the oxide is an SiO 2 ---TiO 2 mixture.
Claim 6
Dependent Claim
18 words
Aerogel microbeads as claimed in claim 2, wherein the oxide is an SiO 2 --M g O mixture.
Claim 7
Dependent Claim
14 words
Aerogel microbeads as claimed in claim 2, wherein the oxide is SiO 2 .
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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) | 1998-02-20 | 1998-08-22 | 1999-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-20 | 2002-08-22 | 2003-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-20 | 2006-08-22 | 2007-02-21 | $7700.00 | Window Closed / Lapsed |