US3097175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable silica-clad thoria sols and their preparation
Assignee: WR Grace and Co
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Filing: 1957-10-31
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Granted: 1963-07-09
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Expires: 1977-10-31
Abstract
No abstract record available.
Inventors
- 👤 Wayne T Barrett
- 👤 Moises G Sanchez
- 👤 Milton C Vanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:29
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/42; G21C3/44; G21C3/46; G21C3/48; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A HYDROTHERMALLY STABLE SILICA-CLAD THORIA SOL CONSISITNG ESSENTIALLY OF AN ALKALINE AQUEOUS DISPERSION OF 10% TO 60% THORIA PARTICLES HAVING A SURFACE LAYER OF SILICA IN SUFFICIENT AMOUNT TO IMPART TO SAID PARTICLES A NEGATIVE CHARGE AS MEASURED BY THE ELECTROPHOERETIC METHOD AND CONTAINING A SUFFICIENT QUANTITY OF ALKALI METAL HYDROXIDE TO GIVE A SOLUTION PH OF 7.0-100.
Claim 2
Dependent Claim
58 words
A HYDROTHERMALLY STABLE SILICA-CLAD THORIA SOL CONSISITNG ESSENTIALLY OF AN ALKALINE AQUEOUS DISPERSION OF 10% TO 60% THORIA PARTICLES HAVING A SURFACE LAYER OF SILICA IN SUFFICIENT AMOUNT TO IMPART TO SAID PARTICLES A NEGATIVE CHARGE AS MEASURED BY THE ELECTROPHOERETIC METHOD AND CONTAINING A SUFFICIENT QUANTITY OF ALKALI METAL HYDROXIDE TO GIVE A SOLUTION PH OF 7.0-100.
Claim 3
Independent Claim
72 words
THE METHOD OF PREPARING A THERMALLY STABLE SILICACLAD THORIA SOL COMPRISING THE STEPS OF RAPIDLY MIXING AN AQUEOUS THORIA SOL AT A CONCENTRATION BELOW ABOUT 10% WITH AN ACTIVE AQUEOUS SILICA SOL IN SUFFICIENT QUNTITY TO CHANGE THE ELECTRICAL CHARGE ON THE THORIA PARTICLES AS MEASURED BY TEH ELECTROPHORETIC METHOD FROM POSITIVE TOP NEGATIVE, ADDING SUFFICIENT SOLUBLE ALKALI METAL HYDROXIDE TO GIVE A SOLUTION PH OF 7.0-110, AND THEREAFTER CONCENTRATING SAID SOL.
Claim 4
Independent Claim
72 words
THE METHOD OF PREPARING A THERMALLY STABLE SILICACLAD THORIA SOL COMPRISING THE STEPS OF RAPIDLY MIXING AN AQUEOUS THORIA SOL AT A CONCENTRATION BELOW ABOUT 10% WITH AN ACTIVE AQUEOUS SILICA SOL IN SUFFICIENT QUNTITY TO CHANGE THE ELECTRICAL CHARGE ON THE THORIA PARTICLES AS MEASURED BY TEH ELECTROPHORETIC METHOD FROM POSITIVE TOP NEGATIVE, ADDING SUFFICIENT SOLUBLE ALKALI METAL HYDROXIDE TO GIVE A SOLUTION PH OF 7.0-110, AND THEREAFTER CONCENTRATING SAID SOL.
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) | 1966-07-08 | 1967-01-07 | 1967-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-08 | 1971-01-07 | 1971-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-08 | 1975-01-07 | 1975-07-09 | $7700.00 | Window Closed / Lapsed |