US2663620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alumina from aluminum chloride hexahydrate
Assignee: Universal Oil Products Co
•
Filing: 1949-10-29
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Granted: 1953-12-22
•
Expires: 1969-10-29
Abstract
No abstract record available.
Inventors
- 👤 Haensel Vladimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:24
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR PREPARING ALUMINA WHICH COMPRISES HEATING ALUMINUM CHLORIDE HEXAHYDRATE AT A TEMPERATURE OF FROM ABOUT 225* TO 600* F. FOR A PERIOD OF TIME SUCH AS TO LIBERATE ONLY A PORTION OF ITS CHLORINE CONTENT, COMMINGLING A BASIC REAGENT WITH THE RESULTANT CHLORINE-CONTAINING RESIDUE TO FORM ALUMINUM HYDROXIDE, WASHING AND FILTERING THE LATTER AND THEN CALCINING TO PRODUCE THE OXIDE.
Claim 2
Dependent Claim
62 words
A PROCESS FOR PREPARING ALUMINA WHICH COMPRISES HEATING ALUMINUM CHLORIDE HEXAHYDRATE AT A TEMPERATURE OF FROM ABOUT 225* TO 600* F. FOR A PERIOD OF TIME SUCH AS TO LIBERATE ONLY A PORTION OF ITS CHLORINE CONTENT, COMMINGLING A BASIC REAGENT WITH THE RESULTANT CHLORINE-CONTAINING RESIDUE TO FORM ALUMINUM HYDROXIDE, WASHING AND FILTERING THE LATTER AND THEN CALCINING TO PRODUCE THE OXIDE.
References Cited (Backward Citations)
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Cited
FR657444A
Cited
US2189376A
Cited
US2443285A
Cited
US2413709A
Cited
US2479110A
Cited
US2479109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |