Patent US2746842A successfully refreshed from Google Patents.
US2746842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alumina
Assignee: Universal Oil Products Co
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Filing: 1954-01-21
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Granted: 1956-05-22
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Expires: 1974-01-21
Abstract
No abstract record available.
Inventors
- 👤 Herman S Bloch
- 👤 George L Hervert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:32
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/428
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR PRODUCING ALUMINA WHICH COMPRISES COMMINGLING ALUMINUM AND AN AQUEOUS SOLUTION OF AN ACID WHICH IS REACTABLE WITH ALUMINUM TO FORM HYDROGEN, REACTING SAID SOLUTION AND ALUMINUM IN THE ABSENCE OF MERCURY UNTIL AT LEAST 15% OF THE HYDROGEN WHICH IS STOICHIOMETRICALLY EQUIVALENT TO THE AMOUNT OF ACID INITIALLY PRESENT IS EVOLVED, SUBSEQUENTLY ADDING A PROMOTER COMPRISING MERCURY, AND EFFECTING FURTHER REACTION IN THE PRESENT OF SAID MERCURY AND SEPARATELY RECOVERING ALUMINA THEREFROM.
Claim 2
Dependent Claim
75 words
A PROCESS FOR PRODUCING ALUMINA WHICH COMPRISES COMMINGLING ALUMINUM AND AN AQUEOUS SOLUTION OF AN ACID WHICH IS REACTABLE WITH ALUMINUM TO FORM HYDROGEN, REACTING SAID SOLUTION AND ALUMINUM IN THE ABSENCE OF MERCURY UNTIL AT LEAST 15% OF THE HYDROGEN WHICH IS STOICHIOMETRICALLY EQUIVALENT TO THE AMOUNT OF ACID INITIALLY PRESENT IS EVOLVED, SUBSEQUENTLY ADDING A PROMOTER COMPRISING MERCURY, AND EFFECTING FURTHER REACTION IN THE PRESENT OF SAID MERCURY AND SEPARATELY RECOVERING ALUMINA THEREFROM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |