Patent US2907633A successfully refreshed from Google Patents.
US2907633A
Expired / Lapsed
US
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Process for producing aluminum salts
Assignee: Filmfabrik Wolfen VEB
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Filing: 1957-08-13
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Granted: 1959-10-06
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Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Seidel Felix
- 👤 Singer Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:27
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/68; C01F7/74; C01F7/743
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A PROCESS FOR THE PREPARATION OF AN ALUMINUM SALT OF A MINERAL ACID SELECTED FROM THE CLASS CONSISTING OF HYDROCHLORIC, SULFURIC AND NITRIC ACIDS, WHICH COMPRISES TREATING AN ALUMINUM SILICATE BEARING MATERIAL, WHICH HAS NOT BEEN PREVIOUSLY HEAT TREATED, WITH AN AQUEOUS SOLUTION WHEREIN THE SOLUTE CONSISTS ESSENTIALLY OF A FERRIC SALT ON AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC, SULFURIC AND NITRIC ACID IN A CLOSED VESSEL AT TEMPERATURES IN THE RANGE OF FROM ABOUT 175* C. TO ABOUT 250*C. AND RECOVERING THE ALUMINUM SALT OF SAID MINERAL ACID, SAID FERRIC SALT BEING PRESENT IN STOICHIOMETRIC EXCESS WITH RESPECT TO SAID ALUMINUM SILICATE.
References Cited (Backward Citations)
GB240834A
Cited
US1964382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |