Patent US3340205A successfully refreshed from Google Patents.
US3340205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of high purity alumina sol from relatively low grade aluminum
Assignee: Universal Oil Products Co
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Filing: 1965-05-25
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Granted: 1967-09-05
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Expires: 1985-05-25
Abstract
No abstract record available.
Inventors
- 👤 John C Hayes
- 👤 Mcgrath Daniel
- 👤 Haensel Vladimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:47
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/428; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR MANUFACTURING HIGH PURITY ALUMINA SOL FROM LOW PURITY ALUMINUM METAL CONTAINING IN EXCESS OF 0.01% BY WEIGHT OF A METALLIC CONTAMINANT WHICH COMPRISES CONTACTING A CHARGE OF SUCH LOW PURITY ALUMINUM WITH AN AQUEOUS MINERAL ACID SOLUTION IN AN ALUMINUM DIGESTION ZONE; THEREBY DISSOLVING SAID ALUMINUM AND FORMING IN SAID ZONE AN ALUMINA SOL IN ADMIXTURE WITH DROSS METAL PARTICLES ORIGINATING FROM SAID CHARGE AND COMPRISING SAID METALLIC CONTAMINANT AT A CONCENTRATION PER PARTICLE SUBSTANTIALLY GREATER THAN IN THE CHARGE; CONTINUING THE DIGESTION FOR A TIME AND UNDER DIGESTING CONDITIONS SELECTED TO PRODUCE AN ALUMINA SOL HAVING PREDETERMINED ALUMINUM AND ACID ANION CONCENTRATIONS; AT LEAST PARTLY CONCURRENTLY WITH THE DIGESTION, MECHANICALLY REMOVING FROM THE DIGESTION ZONE AT LEAST A PORTION OF THE DROSS METAL PARTICLES; AND RECOVERING FROM THE DIGESTION ZONE A FINISHED ALUMINA SOL.
Claim 2
Dependent Claim
138 words
A PROCESS FOR MANUFACTURING HIGH PURITY ALUMINA SOL FROM LOW PURITY ALUMINUM METAL CONTAINING IN EXCESS OF 0.01% BY WEIGHT OF A METALLIC CONTAMINANT WHICH COMPRISES CONTACTING A CHARGE OF SUCH LOW PURITY ALUMINUM WITH AN AQUEOUS MINERAL ACID SOLUTION IN AN ALUMINUM DIGESTION ZONE; THEREBY DISSOLVING SAID ALUMINUM AND FORMING IN SAID ZONE AN ALUMINA SOL IN ADMIXTURE WITH DROSS METAL PARTICLES ORIGINATING FROM SAID CHARGE AND COMPRISING SAID METALLIC CONTAMINANT AT A CONCENTRATION PER PARTICLE SUBSTANTIALLY GREATER THAN IN THE CHARGE; CONTINUING THE DIGESTION FOR A TIME AND UNDER DIGESTING CONDITIONS SELECTED TO PRODUCE AN ALUMINA SOL HAVING PREDETERMINED ALUMINUM AND ACID ANION CONCENTRATIONS; AT LEAST PARTLY CONCURRENTLY WITH THE DIGESTION, MECHANICALLY REMOVING FROM THE DIGESTION ZONE AT LEAST A PORTION OF THE DROSS METAL PARTICLES; AND RECOVERING FROM THE DIGESTION ZONE A FINISHED ALUMINA SOL.
References Cited (Backward Citations)
US3020242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |