US2931779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alumina sols
Assignee: Monsanto Chemicals Ltd
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Filing: 1952-06-21
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Granted: 1960-04-05
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Expires: 1972-06-21
Abstract
No abstract record available.
Inventors
- 👤 John F White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:36
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0008; B01J13/0013; B01J13/0047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS OF MAKING RELATIVELY STABLE ALUMINA SOLS WHICH COMPRISES AGITATING A SUSPENSION OF ALUMINUM HYDRATE IN WATER CONTAINING DISSOLVED THEREIN FROM 1 TO 25% BY WEIGHT OF GELATIN, BASED ON THE ALUMINUM HYDRATE SOLIDS, WITH 1 TO 5 EQUIVALENT PERCENT OF A STRONG MINERAL ACID, BASED ON THE ALUMINUM HYDRATE (CALCULATED AS AL2O3), UNTIL AN ALUMINA AQUASOL IS OBTAINED, SAID ALUMINUM HYDRATE BEING EMPLOYED IN AN AMOUNT TO PROVIDE AN ALUMINA SOL CONTAINING ABOUVE 10% BY WEIGHT AND UP TO 20% BY WEIGHT OF ALUMINA.
Claim 2
Dependent Claim
86 words
A PROCESS OF MAKING RELATIVELY STABLE ALUMINA SOLS WHICH COMPRISES AGITATING A SUSPENSION OF ALUMINUM HYDRATE IN WATER CONTAINING DISSOLVED THEREIN FROM 1 TO 25% BY WEIGHT OF GELATIN, BASED ON THE ALUMINUM HYDRATE SOLIDS, WITH 1 TO 5 EQUIVALENT PERCENT OF A STRONG MINERAL ACID, BASED ON THE ALUMINUM HYDRATE (CALCULATED AS AL2O3), UNTIL AN ALUMINA AQUASOL IS OBTAINED, SAID ALUMINUM HYDRATE BEING EMPLOYED IN AN AMOUNT TO PROVIDE AN ALUMINA SOL CONTAINING ABOUVE 10% BY WEIGHT AND UP TO 20% BY WEIGHT OF ALUMINA.
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |