US4944895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing liquid crystalline composites
Assignee: CNA Holdings LLC
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Filing: 1988-08-24
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Granted: 1990-07-31
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Expires: 2008-08-24
Abstract
Abstract This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component. In one embodiment this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline compound.
Inventors
- 👤 Alan Buckley
- 👤 Tessie M. Che
- 👤 Thomas M. Leslie
- 👤 James B. Stamatoff
- 👤 Dagobert E. Stuetz
- 👤 Donald R. Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:54
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K2323/00; C09K2323/05; C09K2323/053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A process for producing a composite composition comprising a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component, which comprises hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water, a water-miscible organic solvent and a liquid crystalline component, until gellation of the reaction medium is completed, and removing the solvent medium to provide a porous glass monolith with incorporated liquid crystalline component; wherein the glass monolith microporous structure has an average pore diameter in the range between about 50-300 angstroms, and substantially all of the pore diameters are within about a 100 angstrom diameter variation range.
Claim 2
Dependent Claim
107 words
A process for producing a composite composition comprising a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component, which comprises hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water, a water-miscible organic solvent and a liquid crystalline component, until gellation of the reaction medium is completed, and removing the solvent medium to provide a porous glass monolith with incorporated liquid crystalline component; wherein the glass monolith microporous structure has an average pore diameter in the range between about 50-300 angstroms, and substantially all of the pore diameters are within about a 100 angstrom diameter variation range.
Claim 3
Dependent Claim
13 words
A composite composition produced in accordance with the sol-gel process of claim 1.
Claim 4
Dependent Claim
110 words
A process for producing a composite composition comprising an inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component, which comprises (1) hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water and a water-miscible organic solvent until gellation of the reaction medium is completed; (2) removing the solvent medium to provide a porous glass monolith; and (3) impregnating the porous glass monolith with a liquid crystalline component; wherein the glass monolith microporous structure has an average pore diameter in the range between about 50-300 angstroms, and substantially all of the pore diameters are within about a 100 angstrom diameter variation range.
Claim 5
Dependent Claim
110 words
A process for producing a composite composition comprising an inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component, which comprises (1) hydrolyzing tetraalkoxysilane under acidic or basic pH conditions in a sol-gel reaction medium comprising water and a water-miscible organic solvent until gellation of the reaction medium is completed; (2) removing the solvent medium to provide a porous glass monolith; and (3) impregnating the porous glass monolith with a liquid crystalline component; wherein the glass monolith microporous structure has an average pore diameter in the range between about 50-300 angstroms, and substantially all of the pore diameters are within about a 100 angstrom diameter variation range.
Claim 6
Dependent Claim
13 words
A composite composition produced in accordance with the sol-gel process of claim 3.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |