US2590833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing alumina hydrate sols
Assignee: EIDP Inc
•
Filing: 1948-05-20
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Granted: 1952-04-01
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Expires: 1968-05-20
Abstract
No abstract record available.
Inventors
- 👤 Bechtold Max Fredrick
- 👤 Stark Henry Moroni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:20
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR THE PREPARATION OF COLLOIDAL ALUMINA HYDRATE SOLUTIONS WHICH COMPRISES PRECIPITATING, WITH A WATER-SOLUBLE BASE, TO A FINAL PH OF 7 TO 9.5, HYDROUS ALUMINA HYDRATE FROM AN AQUEOUS SOLUTION OF AN ALUMINUM SALT OF A MONOBASIC ACID, WASHING THE PRECIPITATED ALUMINA HYDRATE UNTIL IT CONTAINS BUT 1 TO 5% BY WEIGHT OF THE ANION ORIGINALLY PRESENT IN THE ALUMINUM SALT, HEATING AN AQUEOUS SLURRY OF THE ALUMINA HYDRATE CONTAINING NOT LESS THAN 1% AND NOT MORE THAN 5% BY WEIGHT OF SAID HYDRATE OF SALT ANION AT 60-95* C. FOR ONE TO FOUR HOURS AND SUBJECTING THE RESULTING SOL TO A SHEARING STRESS OF AT LEAST 0.08 POUND PER SQUARE INCH.
Claim 2
Dependent Claim
114 words
A PROCESS FOR THE PREPARATION OF COLLOIDAL ALUMINA HYDRATE SOLUTIONS WHICH COMPRISES PRECIPITATING, WITH A WATER-SOLUBLE BASE, TO A FINAL PH OF 7 TO 9.5, HYDROUS ALUMINA HYDRATE FROM AN AQUEOUS SOLUTION OF AN ALUMINUM SALT OF A MONOBASIC ACID, WASHING THE PRECIPITATED ALUMINA HYDRATE UNTIL IT CONTAINS BUT 1 TO 5% BY WEIGHT OF THE ANION ORIGINALLY PRESENT IN THE ALUMINUM SALT, HEATING AN AQUEOUS SLURRY OF THE ALUMINA HYDRATE CONTAINING NOT LESS THAN 1% AND NOT MORE THAN 5% BY WEIGHT OF SAID HYDRATE OF SALT ANION AT 60-95* C. FOR ONE TO FOUR HOURS AND SUBJECTING THE RESULTING SOL TO A SHEARING STRESS OF AT LEAST 0.08 POUND PER SQUARE INCH.
References Cited (Backward Citations)
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US1747177A
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US2085129A
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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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |