US3055737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing alumina gels
Assignee: WR Grace and Co
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Filing: 1960-05-25
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Granted: 1962-09-25
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Expires: 1980-05-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles P Wilson
- 👤 Frank G Ciapetta
- 👤 Jr James W Elston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PREPARING ALUMINA GELS WHICH COMPRISES CONTACTING AN ALUMINUM SULFATE SOLUTION WITH AN AQUEOUS SLURRY OF CALCIUM CARBONATE TO FORM A BASIC ALININUM SULFATE SOL AT A PH OF 3.5 TO 3.7, ADDING SUFFICIENT SODIUM CARBONATE TO SAID SOL INCREASE THE PH OF SAID SOL TO 3.9, ADDING SUFFICIENT AMMONIUM HYDROXIDE SOLUTION TO GEL THE ALUMINA AND FORM A VISCOUS SLURRY HAVING A PH OF 5.0, ADDING SUFFICIENT SODIUM CARBONATE TO INCREASE THE PH OF THE GELLED ALUMINA TO A PH OF 6.0 AND WASHING SAID PARTICLES TO REMOVE SOLUBLE IMPURITIES AND DRYING SAID GEL.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PREPARING ALUMINA GELS WHICH COMPRISES CONTACTING AN ALUMINUM SULFATE SOLUTION WITH AN AQUEOUS SLURRY OF CALCIUM CARBONATE TO FORM A BASIC ALININUM SULFATE SOL AT A PH OF 3.5 TO 3.7, ADDING SUFFICIENT SODIUM CARBONATE TO SAID SOL INCREASE THE PH OF SAID SOL TO 3.9, ADDING SUFFICIENT AMMONIUM HYDROXIDE SOLUTION TO GEL THE ALUMINA AND FORM A VISCOUS SLURRY HAVING A PH OF 5.0, ADDING SUFFICIENT SODIUM CARBONATE TO INCREASE THE PH OF THE GELLED ALUMINA TO A PH OF 6.0 AND WASHING SAID PARTICLES TO REMOVE SOLUBLE IMPURITIES AND DRYING SAID GEL.
References Cited (Backward Citations)
US2898306A
Cited
US2913400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |