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US3079234A
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Process for preparing siliceous aerogels
Assignee: ExxonMobil Oil Corp
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Filing: 1959-10-23
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Granted: 1963-02-26
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Expires: 1979-10-23
Abstract
No abstract record available.
Inventors
- 👤 Edwin E Jenkins
- 👤 Albert B Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:23
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; 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
150 words
A METHOD FOR PREPARING A SILICEOUS AERGEL. CHARACTEROZED BY A PARTICLE DENSITY OF LESS THAN 0.4 GRAM/CC., WHICH COMRPRISES REACTING, IN AN AQUEOUS MEDIA, AN ALKALI METAL SILICATE, A MINERAL ACID AND A WATER-SOLUBLE ALKALI METAL SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACETIC ACID AND A MINERAL ACID TO FORM A SILICEOUS HYDROSOL HAVING A TEMPERATURE ABOVE ITS FREEZING POINT BUT BELOW ABOUT 150*F. CHATACTERIZED BY AN ALKALINITY, EXPRESSED AS THE MOL RATIO OF UNNEUTRALIZED ALKALI METAL HYDROXIDE TO SILICA, OF BETWEEN 0.3 AND 0.7; AN ALKALI METAL SALT CONCENTRATION OF BETWEEN ABOUT 0.3 AND ABOUT 3 GRAMS EQUIVALENTS PER LITER AND A SILICIA CONCENTRATION OF BETWEEN ABOUT 50 AND ABOUT 300 GRAMS SIO2 PER LITER OF HYDROSOL, PERMITTING THE RESULTING HYDROSOL TO SET TO A HYDROGEL, WASHING THE HYDROGEL FREE OF WATER-SOLUBLE MATERIAL AND DRYING THE PRODUCT SO OBTAINED UNDER CONDITIONS OF SUBSTANTIALLY ATMOSPHERIC PRESSURE.
Claim 2
Independent Claim
150 words
A METHOD FOR PREPARING A SILICEOUS AERGEL. CHARACTEROZED BY A PARTICLE DENSITY OF LESS THAN 0.4 GRAM/CC., WHICH COMRPRISES REACTING, IN AN AQUEOUS MEDIA, AN ALKALI METAL SILICATE, A MINERAL ACID AND A WATER-SOLUBLE ALKALI METAL SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACETIC ACID AND A MINERAL ACID TO FORM A SILICEOUS HYDROSOL HAVING A TEMPERATURE ABOVE ITS FREEZING POINT BUT BELOW ABOUT 150*F. CHATACTERIZED BY AN ALKALINITY, EXPRESSED AS THE MOL RATIO OF UNNEUTRALIZED ALKALI METAL HYDROXIDE TO SILICA, OF BETWEEN 0.3 AND 0.7; AN ALKALI METAL SALT CONCENTRATION OF BETWEEN ABOUT 0.3 AND ABOUT 3 GRAMS EQUIVALENTS PER LITER AND A SILICIA CONCENTRATION OF BETWEEN ABOUT 50 AND ABOUT 300 GRAMS SIO2 PER LITER OF HYDROSOL, PERMITTING THE RESULTING HYDROSOL TO SET TO A HYDROGEL, WASHING THE HYDROGEL FREE OF WATER-SOLUBLE MATERIAL AND DRYING THE PRODUCT SO OBTAINED UNDER CONDITIONS OF SUBSTANTIALLY ATMOSPHERIC PRESSURE.
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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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |