US2774744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing low soda-content alumina catalyst
Assignee: WR Grace and Co
•
Filing: 1950-11-06
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Granted: 1956-12-18
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Expires: 1970-11-06
Abstract
No abstract record available.
Inventors
- 👤 Wayne T Barrett
- 👤 Charles E Welling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:08
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/20; B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A ONE-STEP PROCESS FOR REDUCING THE SODA CONTENT OF SODA-CONTAMINATED CRYSTALLINE ALUMINA TRIHYDRATE TO A VALUE BELOW ABOUT 0.05% AND SIMULTANEOUSLY CONVERTING THE TRIHYDRATE TO ALUMINA MONOHYDRATE, WHICH CONSISTS ESSENTIALLY OF SLURRYING THE TRIHYDRATE WITH WATER AND AN ACIDIC MATERIAL OF THE GROUP CONSISTING OF NITRIC ACID, HYDROCHLORIC ACID, ACETIC ACID, THE ALUMINUM SALTS OF SAID ACIDS AND MIXTURES THEREOF, AUTOCLAVING THE SLURRY AT A TEMPERATURE ABOVE 350*F. THEREBY EFFECTING SUBSTANTIALLY COMPLETE CONVERSION TO THE MONOHYDRATE AND THEREBY SOLUBILIZING SODA AS A RESULT OF THE CONVERSION, AND FILTERING AND WATER WASHING THE THUS TREATED ALUMINA.
Claim 2
Dependent Claim
95 words
A ONE-STEP PROCESS FOR REDUCING THE SODA CONTENT OF SODA-CONTAMINATED CRYSTALLINE ALUMINA TRIHYDRATE TO A VALUE BELOW ABOUT 0.05% AND SIMULTANEOUSLY CONVERTING THE TRIHYDRATE TO ALUMINA MONOHYDRATE, WHICH CONSISTS ESSENTIALLY OF SLURRYING THE TRIHYDRATE WITH WATER AND AN ACIDIC MATERIAL OF THE GROUP CONSISTING OF NITRIC ACID, HYDROCHLORIC ACID, ACETIC ACID, THE ALUMINUM SALTS OF SAID ACIDS AND MIXTURES THEREOF, AUTOCLAVING THE SLURRY AT A TEMPERATURE ABOVE 350*F. THEREBY EFFECTING SUBSTANTIALLY COMPLETE CONVERSION TO THE MONOHYDRATE AND THEREBY SOLUBILIZING SODA AS A RESULT OF THE CONVERSION, AND FILTERING AND WATER WASHING THE THUS TREATED ALUMINA.
References Cited (Backward Citations)
US691470A
Cited
US1953201A
Cited
US2180576A
Cited
US2454724A
Cited
US2478675A
Cited
US2378155A
Cited
US2390272A
Cited
US2411807A
Cited
US2492808A
Cited
US2518295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |