US3104944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing alumina free from alkaline earth metal impurities
Assignee: Universal Oil Products Co
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Filing: 1962-01-18
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Granted: 1963-09-24
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Expires: 1982-01-18
Abstract
No abstract record available.
Inventors
- 👤 John C Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:52
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46; C01F7/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD FOR THE PREPARATION OF ALUMINA FROM AN ALUMINUM SALT CONTAINING AN IONIC ALKALINE EARTH METAL IMPURITY WHICH COMPRISES SUBJECTING A SOLUTION OF SAID SALT TO GELATION AT AN ACIDIC PH OF FROM ABOUT 4.5 TO ABOUT 7.0 TO FORM AN ALUMINA HYDROGEL, CONTACTING SAID HYDROGEL WITH AN AMINO-SUBSTITUTED CARBOXYLIC ACID CONTAINING FROM ABOUT 2 TO ABOUT 7 CARBON ATOMS PER MOLECULE AND CAPABLE OF FORMING A SOLUBLE COMPLEX WITH THE ALKALINE EARTH METAL IONS, SAID ACID BEING IN AN AMOUNT OF AT LEAST ONE MOL OF ACID PER MOL OF ALKALINE EARTH METAL ION, WASHING THE RESULTANT SOLUBLE COMPLEX OUT OF THE HYDROGEL AND THEREAFTER CALCINING THE HYDROGEL TO FORM AN ALUMINA SUBSTANTIALLY FREE OF A LAKALINE EARTH METAL IMPURITY.
Claim 2
Independent Claim
122 words
A METHOD FOR THE PREPARATION OF ALUMINA FROM AN ALUMINUM SALT CONTAINING AN IONIC ALKALINE EARTH METAL IMPURITY WHICH COMPRISES SUBJECTING A SOLUTION OF SAID SALT TO GELATION AT AN ACIDIC PH OF FROM ABOUT 4.5 TO ABOUT 7.0 TO FORM AN ALUMINA HYDROGEL, CONTACTING SAID HYDROGEL WITH AN AMINO-SUBSTITUTED CARBOXYLIC ACID CONTAINING FROM ABOUT 2 TO ABOUT 7 CARBON ATOMS PER MOLECULE AND CAPABLE OF FORMING A SOLUBLE COMPLEX WITH THE ALKALINE EARTH METAL IONS, SAID ACID BEING IN AN AMOUNT OF AT LEAST ONE MOL OF ACID PER MOL OF ALKALINE EARTH METAL ION, WASHING THE RESULTANT SOLUBLE COMPLEX OUT OF THE HYDROGEL AND THEREAFTER CALCINING THE HYDROGEL TO FORM AN ALUMINA SUBSTANTIALLY FREE OF A LAKALINE EARTH METAL IMPURITY.
References Cited (Backward Citations)
US1337192A
Cited
US2390272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |