Patent US3973729A successfully refreshed from Google Patents.
Patent US3112995A successfully refreshed from Google Patents.
US3112995A
Expired / Lapsed
US
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Manufacture of alumina from the reaction of ammonium hydroxide with aluminum sulfate
Assignee: Universal Oil Products Co
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Filing: 1961-08-22
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Granted: 1963-12-03
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Expires: 1981-08-22
Abstract
No abstract record available.
Inventors
- 👤 Hoekstra James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:36
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD FOR MANUFACTURING GRANULAR ALUMINA WHICH COMPRISES SIMULTANEOUSLY ADDING AN AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE AND AN AQUEOUS SOLUTION OF ALUMINUM SULFATE TO A MIXING ZONE AND THEREIN COMMINGLING THE SOLUTIONS, CONTROLLING THE RATE OF ADDITION OF SAID SOLUTIONS TO SAID ZONE TO MAINTAIN THE RESULTING REACTION MIXTURE AT AN ACIDIC PH CONSTANTLY AT A LEVEL WITHIN THE RANGE OF FROM ABOUT 5.5 TO ABOUT 6.5 THROUGHOUT THE COMMINGLING OF SAID AQUEOUS SOLUTIONS AND DURING THE PRECIPITATION OF ALUMINA, DISCONTINUING THE ADDITION OF THE ALUMINUM SULFATE SOLUTION AFTER THE PRECIPITATION OF SAID ALUMINA AND CONTINUING THE ADDITION OF THE AMMONIUM HYDROXIDE SOLUTION UNTIL THE PH IS INCREASED TO A LEVEL WITHIN THE RANGE OF ABOUT 7.5 TO ABOUT 8.5, AND THEN SEPARATING THE PRECIPITATED ALUMINA FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
130 words
A METHOD FOR MANUFACTURING GRANULAR ALUMINA WHICH COMPRISES SIMULTANEOUSLY ADDING AN AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE AND AN AQUEOUS SOLUTION OF ALUMINUM SULFATE TO A MIXING ZONE AND THEREIN COMMINGLING THE SOLUTIONS, CONTROLLING THE RATE OF ADDITION OF SAID SOLUTIONS TO SAID ZONE TO MAINTAIN THE RESULTING REACTION MIXTURE AT AN ACIDIC PH CONSTANTLY AT A LEVEL WITHIN THE RANGE OF FROM ABOUT 5.5 TO ABOUT 6.5 THROUGHOUT THE COMMINGLING OF SAID AQUEOUS SOLUTIONS AND DURING THE PRECIPITATION OF ALUMINA, DISCONTINUING THE ADDITION OF THE ALUMINUM SULFATE SOLUTION AFTER THE PRECIPITATION OF SAID ALUMINA AND CONTINUING THE ADDITION OF THE AMMONIUM HYDROXIDE SOLUTION UNTIL THE PH IS INCREASED TO A LEVEL WITHIN THE RANGE OF ABOUT 7.5 TO ABOUT 8.5, AND THEN SEPARATING THE PRECIPITATED ALUMINA FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
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US2838444A
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US2867588A
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US2919973A
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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) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |