US2967168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl-substituted silica aerogels
Assignee: General Electric Co
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Filing: 1954-11-12
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Granted: 1961-01-03
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Expires: 1974-11-12
Abstract
No abstract record available.
Inventors
- 👤 Dallas T Hurd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:38
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
THE PROCESS FOR MAKING A SILICA AEROGEL CONTAINING SILICON-BONDED BINYL GROUPS UNIFORMLY INTERSPERSED THROUGHOUT THE ENTIRE SOLID STRUCTURE OF SAID AEROGEL WHICH COMPRISES (1) COHYDROLIZING A MIXTURE OF A VINYLCHLOROSILANE AND SILICON TETRAHALIDE, WHEREIN THE VINYLCHLOROSILANE REPRESENTS FROM 5 TO 50 PERCENT OF THE COMBINED WEIGHT OF VINYLCLOROSILANES AND SILICON TETRAHALIDE, TO OBTAIN A GELLED COHYDROLYZANE (2) DISSOLVING THE COHYDROLYZATE IN AN AQUEOUS SOLUTION OF AN ALKALI-METAL HYDROXIDE, (3) ACIDIFYING THE ALKALINE SOLUTION OF THE COHYDROLYZATE TO PH OF FROM ABOUT 2 TO 3, (4) PRECIPITATING THE SALT FORMED FROM THE ACIDIFICATION STEP WITH AN ALCOHOL SOLUTION IN WHICH THE ALCOHOL IS SELECTED FROM THE CLASS CONSISTING OF METHANOL AND ETHANOL, (5) AUTOCLAVING THE ALCOHOL SOLUTION THUS OBTAINED AT A TEMPERATURE AND PRESSURE AT LEAST EQUAL TO THE CRITICAL CONSTANTS OF THE MIXTURE, AND (6) THEREAFTER RELEADING THE VAPORS FORMED IN THE PRESSURE REACTOR WHILE CONTINUING TO MAINTAIN A TEMPERATURE BETWEEN 275* TO 375*C.
Claim 2
Dependent Claim
154 words
THE PROCESS FOR MAKING A SILICA AEROGEL CONTAINING SILICON-BONDED BINYL GROUPS UNIFORMLY INTERSPERSED THROUGHOUT THE ENTIRE SOLID STRUCTURE OF SAID AEROGEL WHICH COMPRISES (1) COHYDROLIZING A MIXTURE OF A VINYLCHLOROSILANE AND SILICON TETRAHALIDE, WHEREIN THE VINYLCHLOROSILANE REPRESENTS FROM 5 TO 50 PERCENT OF THE COMBINED WEIGHT OF VINYLCLOROSILANES AND SILICON TETRAHALIDE, TO OBTAIN A GELLED COHYDROLYZANE (2) DISSOLVING THE COHYDROLYZATE IN AN AQUEOUS SOLUTION OF AN ALKALI-METAL HYDROXIDE, (3) ACIDIFYING THE ALKALINE SOLUTION OF THE COHYDROLYZATE TO PH OF FROM ABOUT 2 TO 3, (4) PRECIPITATING THE SALT FORMED FROM THE ACIDIFICATION STEP WITH AN ALCOHOL SOLUTION IN WHICH THE ALCOHOL IS SELECTED FROM THE CLASS CONSISTING OF METHANOL AND ETHANOL, (5) AUTOCLAVING THE ALCOHOL SOLUTION THUS OBTAINED AT A TEMPERATURE AND PRESSURE AT LEAST EQUAL TO THE CRITICAL CONSTANTS OF THE MIXTURE, AND (6) THEREAFTER RELEADING THE VAPORS FORMED IN THE PRESSURE REACTOR WHILE CONTINUING TO MAINTAIN A TEMPERATURE BETWEEN 275* TO 375*C.
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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |