US3660302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anhydrous silicic acid organosols
Assignee: WR Grace and Co
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Filing: 1968-05-27
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Granted: 1972-05-02
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Expires: 1988-05-27
Abstract
Abstract A PROCESS FOR PREPARING NON-AQUEOUS ORGANOSOLS OF LOW MOLECULAR WEIGHT SILICIC ACID. VERY STABLE ORGANOSOLS ARE OBTAINED BY ADDING FRESHLY PREPARED ACIDIC SILICA HYDROSOLS TO SOLVENTS WHICH ARE STRONG ELECTRON DONORS AND WHICH ARE FREE OF HYDROXYL GROUPS AND UNSATURATION. AFTER REMOVAL OF WATER, THE RESULTANT ANHYDROUS SOLUTIONS ARE VERY STABLE AND THE DISSOLVED SILICIC ACID HAS AN UNUSUALLY LOW MOLECULAR WEIGHT.
Inventors
- 👤 Milton E Winyall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:34
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |