Patent US495955A successfully refreshed from Google Patents.
Patent US3012973A successfully refreshed from Google Patents.
US3012973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrated silica aquasols of low viscosity and their preparation
Assignee: EIDP Inc
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Filing: 1959-03-18
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Granted: 1961-12-12
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Expires: 1979-03-18
Abstract
No abstract record available.
Inventors
- 👤 Robert C Atkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:44
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/148; C08J2201/00; C08J2201/02; C08J2201/038
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
AN AQUASOL OF AMORPHOUS SILICA PARTICLES HAVING A SURFACE AREA, A, OF FROM 60 TO 300 SQUARE METERS PER GRAM, THE SOL BEING STABILIZED BY CONTAINING AN AMOUNT OF ALKALI SUFFICIENT TO GIVE THE SOL AN SIO2:M2O MOL RATIO, R, OF FROM 10,000/A:1 TO 120,000/A:1 WHERE M IS A MONOVALENT CATION IN WHICH THERE IS NO HYDROCARBON CHAIN SUBSTITUENT LONGER THAN 4 CARBON ATOMS, THE CONCENTRATION OF SILICA IN THE SOL BEING FROM ABOVE
Claim 2
Dependent Claim
74 words
AN AQUASOL OF AMORPHOUS SILICA PARTICLES HAVING A SURFACE AREA, A, OF FROM 60 TO 300 SQUARE METERS PER GRAM, THE SOL BEING STABILIZED BY CONTAINING AN AMOUNT OF ALKALI SUFFICIENT TO GIVE THE SOL AN SIO2:M2O MOL RATIO, R, OF FROM 10,000/A:1 TO 120,000/A:1 WHERE M IS A MONOVALENT CATION IN WHICH THERE IS NO HYDROCARBON CHAIN SUBSTITUENT LONGER THAN 4 CARBON ATOMS, THE CONCENTRATION OF SILICA IN THE SOL BEING FROM ABOVE
Claim 3
Dependent Claim
142 words
IN A PROCESS FOR PRODUCING CONCENTRATED SILICA AQUASOLS OF LOW VISCOSITY THE STEPS COMPRISING PREPARING AN AQUASOL OF AMORPHOUS SILICA PARTICLES HAVING A SURFACE AREA, A, OF FROM 60 TO 300 SQUARE METERS PER GRAM, SAID SOL HAVING A RELATIVE VISCOSITY, AS MEASURED AT 10% SIO2 AND PH 2, OF FROM 1.13 TO 1.45 CONTAINING LESS THAN 35% SIO2 BY WEIGHT, DEIONIZING SAID SOL BY BRINGING IT INTO CONTACT WITH A CATION EXCHANGE RESIN IN THE HYDROGEN FROM AND AN ANION EXCHANGE RESIN IN THE HYDROXYL FORM, ADJUSTING THE SIO2:M2O MOL RATIO, R, TO FROM 10,000/A:1 TO 120,000/A:1, WHERE M IS A MONOVALENT CATION IN WHICH THERE IS NO HYDROCARBON CHAIN SUBSTITUENT LONGER THAN 4 CARBON ATOMS, BY ADING AN ALKALI OF CATION OF THE ADDING ALSO AN AMOUNT OF SOLUBLE SALT OF A CATION OF THE M GROUP EQUAL TO FORM
Claim 4
Dependent Claim
142 words
IN A PROCESS FOR PRODUCING CONCENTRATED SILICA AQUASOLS OF LOW VISCOSITY THE STEPS COMPRISING PREPARING AN AQUASOL OF AMORPHOUS SILICA PARTICLES HAVING A SURFACE AREA, A, OF FROM 60 TO 300 SQUARE METERS PER GRAM, SAID SOL HAVING A RELATIVE VISCOSITY, AS MEASURED AT 10% SIO2 AND PH 2, OF FROM 1.13 TO 1.45 CONTAINING LESS THAN 35% SIO2 BY WEIGHT, DEIONIZING SAID SOL BY BRINGING IT INTO CONTACT WITH A CATION EXCHANGE RESIN IN THE HYDROGEN FROM AND AN ANION EXCHANGE RESIN IN THE HYDROXYL FORM, ADJUSTING THE SIO2:M2O MOL RATIO, R, TO FROM 10,000/A:1 TO 120,000/A:1, WHERE M IS A MONOVALENT CATION IN WHICH THERE IS NO HYDROCARBON CHAIN SUBSTITUENT LONGER THAN 4 CARBON ATOMS, BY ADING AN ALKALI OF CATION OF THE ADDING ALSO AN AMOUNT OF SOLUBLE SALT OF A CATION OF THE M GROUP EQUAL TO FORM
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) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |