US4810674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous glass monoliths
Assignee: CNA Holdings LLC
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Filing: 1988-01-28
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Granted: 1989-03-07
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Expires: 2008-01-28
Abstract
Abstract In one embodiment this invention provides novel microporous inorganic oxide glass monolith structures, which have improved mechanical strength and optical transparency. An invention glass monolith is produced by a novel sol-gel process, which utilizes trioxane as an essential additive during the gellation phase, to provide a glass monolith with micropores having uniformity of size and shape.
Inventors
- 👤 Tessie M. Che
- 👤 Raymond V. Carney
- 👤 Duane L. Dotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:15
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/12; C03C; C03C1/00; C03C1/006; C03C11/00; Y; Y10; Y10S; Y10S65/00; Y10S65/90; Y10S65/901; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A microporous glass monolith composition produced in accordance with a sol-gel process which comprises (1) hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water and trioxane until gellation of the reaction medium is completed; (2) heating and drying the gelled medium at a temperature between about 50°-200° C. to remove water and trioxane from the medium and form a microporous glass monolith; and (3) heating the microporous glass monolith at a temperature between about 600°-900° C. to provide a densified microporous glass monolith; wherein the macroporous glass monolith has pore diameters in the range between about 15-2000 angstroms, and pore diameters within the glass monolith are within about a 100 angstom from the largest pore to the smallest pore, and the glass monolith is optically transparent.
Claim 2
Dependent Claim
132 words
A microporous glass monolith composition produced in accordance with a sol-gel process which comprises (1) hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water and trioxane until gellation of the reaction medium is completed; (2) heating and drying the gelled medium at a temperature between about 50°-200° C. to remove water and trioxane from the medium and form a microporous glass monolith; and (3) heating the microporous glass monolith at a temperature between about 600°-900° C. to provide a densified microporous glass monolith; wherein the macroporous glass monolith has pore diameters in the range between about 15-2000 angstroms, and pore diameters within the glass monolith are within about a 100 angstom from the largest pore to the smallest pore, and the glass monolith is optically transparent.
Claim 3
Dependent Claim
21 words
A microporous glass monolith composition in accordance with claim 1, which has at least one diameter of three centimeters or more.
Claim 4
Dependent Claim
154 words
A composite composition consisting of a homogeneous inorganic oxide glass monolith with a microporous structure containing an organic component, produced by a process which comprises (1) hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water and trioxane until gellation of the reaction medium is completed; (2) heating and drying the gelled medium at a temperature between about 50°-200° C. to remove water and trioxane from the medium and form a microporous glass monolith; (3) heating the microporous glass monolith at a temperature between about 600°-900° C. to provide a densified microporous glass monolith; and (4) impregnating the microporous glass monolith with an organic component; wherein the macroporous glass monolith has pore diameters in the range between about 15-2000 angstroms, and the pore diameters within the glass monolith are within about a 100 angstrom from the largest pore to the smallest pore, and the glass monolith is optically transparent.
Claim 5
Dependent Claim
154 words
A composite composition consisting of a homogeneous inorganic oxide glass monolith with a microporous structure containing an organic component, produced by a process which comprises (1) hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water and trioxane until gellation of the reaction medium is completed; (2) heating and drying the gelled medium at a temperature between about 50°-200° C. to remove water and trioxane from the medium and form a microporous glass monolith; (3) heating the microporous glass monolith at a temperature between about 600°-900° C. to provide a densified microporous glass monolith; and (4) impregnating the microporous glass monolith with an organic component; wherein the macroporous glass monolith has pore diameters in the range between about 15-2000 angstroms, and the pore diameters within the glass monolith are within about a 100 angstrom from the largest pore to the smallest pore, and the glass monolith is optically transparent.
Claim 6
Dependent Claim
19 words
A composite composition in accordance with claim 3, which has at least one diameter of three centimeres or more.
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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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |