US2807588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of preparing hydrogels and aerogels
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-09-24
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Granted: 1957-09-24
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Expires: 1973-09-24
Abstract
No abstract record available.
Inventors
- 👤 John F White
- 👤 William S Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:11
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0091; 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
134 words
A METHOD OF PREPARING INORGANIC AEROGELS CONTAINING SILICIA WHICH COMPRISES HEATING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF (1) SILICA CONTAINING INORGANIC HYDROGELS HAVING AN SIO2 CONTENT OF ABOUT 5 TO 15% BY WEIGHT, A PH VARYING FROM ABOUT 1.5 UP TO SUBSTANTIALLY NEUTRAL AND CONTAINING LESS THAN 0.001% BY WEIGHT OF METALLIC CATIONS AND (2) SILICA CONTAINING INORGANIC HYDROSOLS HAVING AN SIO2 CONTENT OF ABOUT 5 TO 15% BY WEIGHT, A PH OF ABOUT 1.5 TO ABOUT 3.0 AND CONTAINING LESS THAN 0.001% BY WEIGHT OF METALLIC CATIONS, IN A CLOSED SYSTEM WITHOUT SUBJECTING THE SUBSTANCE TO A SUBSTANTIAL COMPRESSIVE WATER-SOLID INTERFACE UNTIL THE WATER IN SAID SUBSTANCE IS CONVERTED TO WATER VAPOR, AND ALLOWING WATER VAPOR TO ESCAPE FROM SAID CLOSED SYSTEM WITHOUT SUBSTANTIALLY INJURING THE GEL STRUCTURE OF SAID SUBSTANCE.
Claim 2
Independent Claim
134 words
A METHOD OF PREPARING INORGANIC AEROGELS CONTAINING SILICIA WHICH COMPRISES HEATING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF (1) SILICA CONTAINING INORGANIC HYDROGELS HAVING AN SIO2 CONTENT OF ABOUT 5 TO 15% BY WEIGHT, A PH VARYING FROM ABOUT 1.5 UP TO SUBSTANTIALLY NEUTRAL AND CONTAINING LESS THAN 0.001% BY WEIGHT OF METALLIC CATIONS AND (2) SILICA CONTAINING INORGANIC HYDROSOLS HAVING AN SIO2 CONTENT OF ABOUT 5 TO 15% BY WEIGHT, A PH OF ABOUT 1.5 TO ABOUT 3.0 AND CONTAINING LESS THAN 0.001% BY WEIGHT OF METALLIC CATIONS, IN A CLOSED SYSTEM WITHOUT SUBJECTING THE SUBSTANCE TO A SUBSTANTIAL COMPRESSIVE WATER-SOLID INTERFACE UNTIL THE WATER IN SAID SUBSTANCE IS CONVERTED TO WATER VAPOR, AND ALLOWING WATER VAPOR TO ESCAPE FROM SAID CLOSED SYSTEM WITHOUT SUBSTANTIALLY INJURING THE GEL STRUCTURE OF SAID SUBSTANCE.
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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |