US2820693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making alumina using tin, lead, or germanium as a catalyst
Assignee: Universal Oil Products Co
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Filing: 1955-10-24
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Granted: 1958-01-21
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Expires: 1975-10-24
Abstract
No abstract record available.
Inventors
- 👤 George L Hervert
- 👤 Herman S Bloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0047; B01J23/00; B01J23/14; C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/428
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PRODUCING ALUMINA WHICH COMPRISES COMMINGLING ALUMINUM CONTAINING LESS THAN 100 PARTS PER MILLION (BASED ON THE ALUMINUM) OF A METAL SELECTED FROM THE GROUP CONSISTING OF TIN, LEAD AND GERMANIUM AND AN AQUEOUS SOLUTION OF AN ACID WHICH IS REACTABLE WITH ALUMINUM TO FORM HYDROGEN, REACTING SAID SOLUTION AND SAID ALUMINUM UNTIL AT LEAST 25% OF THE HYDROGEN WHICH IS STOICHIOMETRICALLY EQUIVALENT TO THE AMOUNT OF ACID INITIALLY PRESENT IS EVOLVED, SUBSEQUENTLY ADDING ALUMINUM CONTAINING FROM ABOUT 100 TO ABOUT 10,000 PARTS PER MILLION (BASED ON THE ALUMINUM) OF A METAL SELECTED FROM THE GROUP CONSISTING OF TIN, LEAD AND GERMANIUM, EFFECTING FURTHER REACTION AND RECOVERING ALUMINA FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PRODUCING ALUMINA WHICH COMPRISES COMMINGLING ALUMINUM CONTAINING LESS THAN 100 PARTS PER MILLION (BASED ON THE ALUMINUM) OF A METAL SELECTED FROM THE GROUP CONSISTING OF TIN, LEAD AND GERMANIUM AND AN AQUEOUS SOLUTION OF AN ACID WHICH IS REACTABLE WITH ALUMINUM TO FORM HYDROGEN, REACTING SAID SOLUTION AND SAID ALUMINUM UNTIL AT LEAST 25% OF THE HYDROGEN WHICH IS STOICHIOMETRICALLY EQUIVALENT TO THE AMOUNT OF ACID INITIALLY PRESENT IS EVOLVED, SUBSEQUENTLY ADDING ALUMINUM CONTAINING FROM ABOUT 100 TO ABOUT 10,000 PARTS PER MILLION (BASED ON THE ALUMINUM) OF A METAL SELECTED FROM THE GROUP CONSISTING OF TIN, LEAD AND GERMANIUM, EFFECTING FURTHER REACTION AND RECOVERING ALUMINA FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2746842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |