Patent US5196382A successfully refreshed from Google Patents.
US5196382A
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Method for rapid production of large sol-gel SiO2 containing monoliths of silica with and without transition metals
Assignee: GRYPHON VENTURES II LP
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Filing: 1990-08-16
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Granted: 1993-03-23
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Expires: 2010-08-16
Abstract
Abstract A process for producing sol-gel monoliths containing SiO 2 by mixing water, a SiO 2 precursor and ketomalonic acid to form a sol, gelling the sol, aging the gelled sol and drying the aged gelled sol. Optional additional ingredients that may be added in the mixing step include salts of non-precipitating transition metals such as copper and/or additional precursors such as precursors for B 2 O 3 , Na 2 O, Li 2 O, TiO 2 , Al 2 O 3 or mixtures thereof.
Inventors
- 👤 Larry L. Hench
- 👤 Shi-Ho Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:56
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0056; C; C03; C03C; C03C1/00; C03C1/006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A process for producing sol-gel monoliths containing SiO 2 comprising the steps of: a. mixing water, a SiO 2 precursor and ketomalonic acid to form a sol, b. gelling the sol, c. aging the gelled sol, and d. drying the aged gelled sol, wherein the constituents are present in the ratio 10-25 moles of water, 0.5-2.5 moles SiO 2 precursor and 0.01-0.1 moles ketomalonic acid.
Claim 2
Dependent Claim
65 words
A process for producing sol-gel monoliths containing SiO 2 comprising the steps of: a. mixing water, a SiO 2 precursor and ketomalonic acid to form a sol, b. gelling the sol, c. aging the gelled sol, and d. drying the aged gelled sol, wherein the constituents are present in the ratio 10-25 moles of water, 0.5-2.5 moles SiO 2 precursor and 0.01-0.1 moles ketomalonic acid.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein the mixing step includes the addition of a non precipitating salt of a transition metal.
Claim 4
Dependent Claim
12 words
A process according to claim 2 wherein the transition metal is copper.
Claim 5
Dependent Claim
22 words
A process according to claim 2 wherein the ratio of salt of a transition metal to ketomalonic acid is less than 1.0.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein the dried aged gelled sol is densified by heating to from about 500° C. to about 1350° C.
Claim 7
Dependent Claim
45 words
A process according to claim 1 wherein the mixing step includes the addition of a precursor selected from the group consisting of precursors of B 2 O 3 , Na 2 O, Li 2 O, TiO 2 , Al 2 O 3 and mixtures thereof.
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) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |