US2921913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica organosols
Assignee: EIDP Inc
•
Filing: 1956-05-01
•
Granted: 1960-01-19
•
Expires: 1976-05-01
Abstract
No abstract record available.
Inventors
- 👤 Guy B Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:16
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A SILICA ORGANOSOL, THE RELATIVE VISCOSITY OF WHICH, AS MEASURED AT 5% SIO2, IS IN THE RANGE OF 1.1 TO 1.4 AND SHOWS SUBSTANTIALLY NO INCREASE UPON STORAGE FOR ONE MONTH AT 30*C., SAID ORGANOSOL HAVING A SILICA CONTENT OF 30 TO 50% SIO2 BY WEIGHT AND COMPRISING SUBSTANTIALLY NON-AGGREGATED, AMORPHOUS, DENSE, SPHERICAL SILICA PARTICLES 10 TO 25 MILLIMICRONS IN DIAMETER SURFACEESTERFIED WITH UP TO 2 ESTER GROUPS OF ETHYLENE GLYCOL PER SQUARE MILLIMICRONS IN DIAMETER SURFACEDISPERSED IN ETHYLENE GLYCOL, THE SOL BEING STABLIZED WITH ENOUGH SODIUM HYDROXIDE TO GIVE AN SIO2:NA2O MOL RATIO OF FROM 300D:1 TO 50D:1, WHERE D IS THE AVERAGE PARTICLE DIAMETER MILLIMICRONS, HAVING A PH OF 7.3 TO 8.5 AS MEASURED AT 10% SIO2, AND CONTAINING FROM 0.2 TO 10% WATER.
Claim 2
Dependent Claim
126 words
A SILICA ORGANOSOL, THE RELATIVE VISCOSITY OF WHICH, AS MEASURED AT 5% SIO2, IS IN THE RANGE OF 1.1 TO 1.4 AND SHOWS SUBSTANTIALLY NO INCREASE UPON STORAGE FOR ONE MONTH AT 30*C., SAID ORGANOSOL HAVING A SILICA CONTENT OF 30 TO 50% SIO2 BY WEIGHT AND COMPRISING SUBSTANTIALLY NON-AGGREGATED, AMORPHOUS, DENSE, SPHERICAL SILICA PARTICLES 10 TO 25 MILLIMICRONS IN DIAMETER SURFACEESTERFIED WITH UP TO 2 ESTER GROUPS OF ETHYLENE GLYCOL PER SQUARE MILLIMICRONS IN DIAMETER SURFACEDISPERSED IN ETHYLENE GLYCOL, THE SOL BEING STABLIZED WITH ENOUGH SODIUM HYDROXIDE TO GIVE AN SIO2:NA2O MOL RATIO OF FROM 300D:1 TO 50D:1, WHERE D IS THE AVERAGE PARTICLE DIAMETER MILLIMICRONS, HAVING A PH OF 7.3 TO 8.5 AS MEASURED AT 10% SIO2, AND CONTAINING FROM 0.2 TO 10% WATER.
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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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |