US4851373A
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Large sol-gel SiO2 monoliths containing transition metal and their production
Assignee: GRYPHON VENTURES II LP
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Filing: 1985-02-25
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Granted: 1989-07-25
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Expires: 2005-02-25
Abstract
Abstract Sol-gel monoliths containing SiO 2 and optionally B 2 O 3 , Na 2 O, Li 2 O, TiO 2 , Al 2 O 3 and mixtures thereof, and a transition metal having an atomic number from 21-28 made by mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal and mellitic acid to form a sol, gelling the sol, aging the gelled sol, drying the aged gelled sol and densifying by heating to from about 500° C. to about 1350° C.
Inventors
- 👤 Larry L. Hench
- 👤 Shi-Ho Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/006; C03B; C03B19/00; C03B19/12; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/30; C03B2201/32; C03B2201/40; C03B2201/42; C03B2201/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
A process for producing sol-gel-derived monoliths containing SiO 2 and a transition metal comprising the steps of: (a) mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal, and mellitic acid to form a sol, wherein the amount of mellitic acid is sufficiently great to produce, together with the transition metal, a monolith having an optical absorption of preselected intensity and sufficiently small to avoid precipitation of the transition metal; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gelled sol to form a monolith.
Claim 2
Dependent Claim
93 words
A process for producing sol-gel-derived monoliths containing SiO 2 and a transition metal comprising the steps of: (a) mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal, and mellitic acid to form a sol, wherein the amount of mellitic acid is sufficiently great to produce, together with the transition metal, a monolith having an optical absorption of preselected intensity and sufficiently small to avoid precipitation of the transition metal; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gelled sol to form a monolith.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the dried sol is densified by heating to from about 500° C. to about 1350° C.
Claim 4
Dependent Claim
42 words
A process according to claim 1, wherein the mixing step includes 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.
Claim 5
Dependent Claim
16 words
A process according to claim 1, wherein the transition metal has an atomic number from 21-28.
Claim 6
Dependent Claim
12 words
A sol-gel derived, optical monolith made by the process of claim 1.
Claim 7
Dependent Claim
75 words
A process for producing sol-gel-derived monoliths containing SiO 2 and na transition metal comprising the steps of: (a) mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal, and mellitic acid to form a sol, wherein the ratio of the salt of a transition metal to mellitic acid is less than 1.0; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gelled sol to for a monolith.
Claim 8
Dependent Claim
75 words
A process for producing sol-gel-derived monoliths containing SiO 2 and na transition metal comprising the steps of: (a) mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal, and mellitic acid to form a sol, wherein the ratio of the salt of a transition metal to mellitic acid is less than 1.0; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gelled sol to for a monolith.
Claim 9
Dependent Claim
89 words
A process for producing sol-gel derived monoliths containing SiO 2 and a transition metal comprising the steps of: (a) mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal, and mellitic acid in a ratio of 10-25 moles water to 0.5-2.5 moles of said SiO 2 precursor to 0.001-0.5 moles of said salt of said transition metal to 0.01-0.1 moles of mellitic acid to forma sol; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gel sol to form a monolith.
Claim 10
Dependent Claim
89 words
A process for producing sol-gel derived monoliths containing SiO 2 and a transition metal comprising the steps of: (a) mixing water, a SiO 2 precursor, a non-precipitating salt of a transition metal, and mellitic acid in a ratio of 10-25 moles water to 0.5-2.5 moles of said SiO 2 precursor to 0.001-0.5 moles of said salt of said transition metal to 0.01-0.1 moles of mellitic acid to forma sol; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gel sol to form a monolith.
Claim 11
Dependent Claim
12 words
A sol-gel derived, optical monolith made by the process of claim 7.
Claim 12
Dependent Claim
84 words
A process for producing sol-gel derived optical monoliths containing sIO 2 comprising the steps of: (a) mixing a SiO 2 precursor, water and mellitic acid to form a sol, wherein the amount of mellitic acid is sufficiently great to produce, together with the transition metal, a monolith having an optical absorption of preselected intensity and sufficiently small to avoid precipitation of the transition metal; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gelled sol to form a monolith.
Claim 13
Dependent Claim
84 words
A process for producing sol-gel derived optical monoliths containing sIO 2 comprising the steps of: (a) mixing a SiO 2 precursor, water and mellitic acid to form a sol, wherein the amount of mellitic acid is sufficiently great to produce, together with the transition metal, a monolith having an optical absorption of preselected intensity and sufficiently small to avoid precipitation of the transition metal; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gelled sol to form a monolith.
Claim 14
Dependent Claim
42 words
A process according to claim 7 wherein the mixing steps includes 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 mixture thereof.
Claim 15
Dependent Claim
12 words
A sol-gel derived, optical monolith made by the process of claim 9.
Claim 16
Dependent Claim
76 words
The process for producing sol-gel derived optical monoliths containing SiO 2 comprising the steps of: (a) mixing water, a SiO 2 precursor and mellitic acid to form a sol, wherein the constituents are present in the mixing step in the ratio of 10-25 moles water to 0.5-2.5 moles SiO 2 precursor to 0.01-0.1 moles mellitic acid; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gell sol to form a monolith.
Claim 17
Dependent Claim
76 words
The process for producing sol-gel derived optical monoliths containing SiO 2 comprising the steps of: (a) mixing water, a SiO 2 precursor and mellitic acid to form a sol, wherein the constituents are present in the mixing step in the ratio of 10-25 moles water to 0.5-2.5 moles SiO 2 precursor to 0.01-0.1 moles mellitic acid; (b) gelling the sol; (c) aging the gelled sol; and (d) drying the aged gell sol to form a monolith.
Claim 18
Dependent Claim
12 words
A sol-gel derived, optical monolith made by the proces of claim 12.
References Cited (Backward Citations)
US2281810A
Cited
US2834739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |