Patent US4810415A successfully refreshed from Google Patents.
US4810415A
Expired / Lapsed
US
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Process for manufacturing ultra pure silica and resulting encapsulated products
Assignee: Indresco Inc
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Filing: 1986-09-10
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Granted: 1989-03-07
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Expires: 2006-09-10
Abstract
Abstract High purity silica powder formed from a sol-gel process is made from a quantity of an industrial grade hydrolizable silicon organometallic substance mixed with a quantity of an industrial grade organic solvent miscible in said organometallic substance and with a quantity of an acidified water having a pH less than 2 to form a solution. The solution is heated, then dried to form a gel, milled, and calcined to form the pure silica powder and the pure powder used to form encapsulated micro-miniature circuits.
Inventors
- 👤 Howard M. Winkelbauer
- 👤 Glenn A. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:17
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/163
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A composition for forming a pure silica powder consisting essentially of: a quantity of an industrial grade hydrolyzable silicon organometallic substance; a quantity of an industrial grade organic solvent miscible in said substance, the ratio by volume of said solvent to said organometallic substance being from about 0.1 to about 1:1; a quantity of acidified distilled water having a pH less than 2; and micronized fumed silica; the quantity of said water being from about 520 to about 720% of the stoichiometric amount and the micronized silica being present in an amount up to 16 wt%.
Claim 2
Dependent Claim
96 words
A composition for forming a pure silica powder consisting essentially of: a quantity of an industrial grade hydrolyzable silicon organometallic substance; a quantity of an industrial grade organic solvent miscible in said substance, the ratio by volume of said solvent to said organometallic substance being from about 0.1 to about 1:1; a quantity of acidified distilled water having a pH less than 2; and micronized fumed silica; the quantity of said water being from about 520 to about 720% of the stoichiometric amount and the micronized silica being present in an amount up to 16 wt%.
Claim 3
Dependent Claim
13 words
A composition in accordance with claim 1 wherein the organometallic substance is tetraethylorthosilicate.
Claim 4
Dependent Claim
13 words
A composition in accordance with claim 2 wherein the organic solvent is ethanol.
Claim 5
Dependent Claim
13 words
A composition in accordance with claim 1 wherein the organic solvent is ethanol.
References Cited (Backward Citations)
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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 |