US3059997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing siliceous aerogels
Assignee: ExxonMobil Oil Corp
•
Filing: 1958-12-18
•
Granted: 1962-10-23
•
Expires: 1978-12-18
Abstract
No abstract record available.
Inventors
- 👤 Albert B Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:30
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0091; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/157; C01B33/158; C01B33/1585
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD FOR PREPARING A SILICEOUS AEROGEL WHICH COMPRISES REACTING AN ALKALI METAL SILICATE, IN THE AB-SENCE OF ADDED ACID, WITH A GELLING AGENT SELECTED FROM THE GROUP CONSISTING OF (1) A WATER-SOLUBLE ESTER OF ANN ALCOHOL HAVING ONE TO THREE CARBON ATOMS AND A CARBOXYLIC ACID HAVING ONE TO THREE CARBON ATOMS AND (2) A WATER-SOLUBLE AMIDE TO FORM A SILICEOUS HYDROSOL CHARACTERIZED BY A PH IN THE APPROXIMATE RANGE OF 9 TO 11.55 AND A SILICA CONCENTRATION OF BETWEEN ABOUT 50 AND ABOUT 300 GRAMS SIO2 PER LITER OF HYDROSOL, PERMITTINGG THE RESULTING HYDROSOL TO SET TO A HYDROGEL, INCLUDING MAINTAINING THOSE HYDROSOLS PREPARED WITH A WATER-SOLUBLE AMIDE AT A TEMPERATURE BETWEEN ABOUT 150*F. AND FREE ABOUT 212*F. UNTIL GELATION, WASHING THE HYDROGEL FREE OF WATER-SOLUBLE MATERIAL AND DRYING THE RESULTING PRODUCT.
Claim 2
Independent Claim
134 words
A METHOD FOR PREPARING A SILICEOUS AEROGEL WHICH COMPRISES REACTING AN ALKALI METAL SILICATE, IN THE AB-SENCE OF ADDED ACID, WITH A GELLING AGENT SELECTED FROM THE GROUP CONSISTING OF (1) A WATER-SOLUBLE ESTER OF ANN ALCOHOL HAVING ONE TO THREE CARBON ATOMS AND A CARBOXYLIC ACID HAVING ONE TO THREE CARBON ATOMS AND (2) A WATER-SOLUBLE AMIDE TO FORM A SILICEOUS HYDROSOL CHARACTERIZED BY A PH IN THE APPROXIMATE RANGE OF 9 TO 11.55 AND A SILICA CONCENTRATION OF BETWEEN ABOUT 50 AND ABOUT 300 GRAMS SIO2 PER LITER OF HYDROSOL, PERMITTINGG THE RESULTING HYDROSOL TO SET TO A HYDROGEL, INCLUDING MAINTAINING THOSE HYDROSOLS PREPARED WITH A WATER-SOLUBLE AMIDE AT A TEMPERATURE BETWEEN ABOUT 150*F. AND FREE ABOUT 212*F. UNTIL GELATION, WASHING THE HYDROGEL FREE OF WATER-SOLUBLE MATERIAL AND DRYING THE RESULTING PRODUCT.
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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) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |