US2988520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina compositions and process for the preparation thereof
Assignee: ChampionX LLC
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Filing: 1955-11-09
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Granted: 1961-06-13
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Expires: 1975-11-09
Abstract
No abstract record available.
Inventors
- 👤 David G Braithwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:33
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A PROCESS FOR PREPARING ALUMINA CHARACTERIZED BY A CLEAR, GLASS-LIKE GEL STRUCTURE EXHIBITING CONTINUITY OF PHASE WHICH COMPRISES PRECIPITATING ALUMINA IN HYDROUS FORM BY ADDING TO AN AQUEOUS ALKALINE ALUMINATE SOLUTION A QUANTITY OF AN INORGANIC ACIDIC COMPOUND HAVING AN ANION WHICH FORMS SALTS WITH ALUMINUM THAT ARE SOLUBLE IN SAID ALKALINE AQUEOUS SOLUTION, SAID ACIDIC COMPOUND BEING FROM THE GROUP CONSISTING OF ALUMINUM SULFATE AND ALUMINUM CHLORIDE, EFFECTING SAID PRECIPITATION AT A TEMPERATURE WITHIN THE RANGE OF 40*F. TO 180*F. WITH THE CONCENTRATION OF ALUMINA WITHIN THE RANGE OF ABOUT 0.88% TO 6% BY WEIGHT, CALCULATED AS AL2O3, MAINTAINING THE PH DURING SAID PRECIPITATION WITHIN THE RANGE OF 8 TO ABOUT 12, CONTROLLING THE TEMPERATURE, CONCENTRATION OF AL2O3 AND PH WITHIN THE AFORESAID RANGES TO PRODUCE A SLURRY OF ALUMINA WHICH WHEN FILTERED AND DRIED CONTAINS THE ALUMINA IN A CONTINUOUS PHASE GLASS-LIKE FORM, ADJUSTING THE SOLIDS CONCENTRATION OF THE SLURRY TO IN EXCESS OF ABOUT 3.5% AL2O3, AND THEN DRYING THE RESULTANT PRODUCT.
Claim 2
Dependent Claim
165 words
A PROCESS FOR PREPARING ALUMINA CHARACTERIZED BY A CLEAR, GLASS-LIKE GEL STRUCTURE EXHIBITING CONTINUITY OF PHASE WHICH COMPRISES PRECIPITATING ALUMINA IN HYDROUS FORM BY ADDING TO AN AQUEOUS ALKALINE ALUMINATE SOLUTION A QUANTITY OF AN INORGANIC ACIDIC COMPOUND HAVING AN ANION WHICH FORMS SALTS WITH ALUMINUM THAT ARE SOLUBLE IN SAID ALKALINE AQUEOUS SOLUTION, SAID ACIDIC COMPOUND BEING FROM THE GROUP CONSISTING OF ALUMINUM SULFATE AND ALUMINUM CHLORIDE, EFFECTING SAID PRECIPITATION AT A TEMPERATURE WITHIN THE RANGE OF 40*F. TO 180*F. WITH THE CONCENTRATION OF ALUMINA WITHIN THE RANGE OF ABOUT 0.88% TO 6% BY WEIGHT, CALCULATED AS AL2O3, MAINTAINING THE PH DURING SAID PRECIPITATION WITHIN THE RANGE OF 8 TO ABOUT 12, CONTROLLING THE TEMPERATURE, CONCENTRATION OF AL2O3 AND PH WITHIN THE AFORESAID RANGES TO PRODUCE A SLURRY OF ALUMINA WHICH WHEN FILTERED AND DRIED CONTAINS THE ALUMINA IN A CONTINUOUS PHASE GLASS-LIKE FORM, ADJUSTING THE SOLIDS CONCENTRATION OF THE SLURRY TO IN EXCESS OF ABOUT 3.5% AL2O3, AND THEN DRYING THE RESULTANT PRODUCT.
Claim 3
Dependent Claim
167 words
A PROCESS FOR PREPARING ALUMINA CHARACTERIZED BY A CLEAR, GLASS-LIKE GEL STRUCTURE EXHIBITING CONTINUITY OF PHASE WHICH COMPRISES ADDING AN ACIDIC AQUEOUS SOLUTION OF AN ALUMINUM SALT FROM THE GROUP CONSISTING OF THE SULFATE AND THE CHLORIDE TO AN ALKALINE AQUEOUS SOLUTION OF SODIUM ALUMINATE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 40*F. TO 140*F. WITH TOTAL CONCENTRATIONS OF SAID ALUMINUM SALT AND SODIUM ALUMINATE WITHIN THE RANGE OF 1.0% TO 2.5% BY WEIGHT, CALCULATED AS AL2O3, THEREBY PRECIPITATING ALUMINA IN HYDROUS FORM, THE RELATIVE PROPORTIONS OF SAID ALUMINUM SALT AND SODIUM ALUMINATE BEING SUFFICIENT TO PRODUCE A PH DURING SAID PRECIPITATION WITHIN THE RANGE OF ABOUT 9 TO ABOUT 10.5, CONTROLLING THE TEMPERATURE, CONCENTRATION OF AL2O3 AND PH WITHIN SAID RANGES TO PRODUCE A SLURRY OF ALUMINA WHICH WHEN FILTERED AND DRIED CONTAINS THE ALUMINA IN A CONTINUOUS PHASE GLASS-LIKE FORM, INCREASING THE CONCENTRATION OF THE ALUMINA SOLIDS IN THE SLURRY TO FROM 4% TO 7% BY WEIGHT AL2O3, AND SPRAY DRYING THE RESULTANT PRODUCT.
Claim 4
Dependent Claim
167 words
A PROCESS FOR PREPARING ALUMINA CHARACTERIZED BY A CLEAR, GLASS-LIKE GEL STRUCTURE EXHIBITING CONTINUITY OF PHASE WHICH COMPRISES ADDING AN ACIDIC AQUEOUS SOLUTION OF AN ALUMINUM SALT FROM THE GROUP CONSISTING OF THE SULFATE AND THE CHLORIDE TO AN ALKALINE AQUEOUS SOLUTION OF SODIUM ALUMINATE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 40*F. TO 140*F. WITH TOTAL CONCENTRATIONS OF SAID ALUMINUM SALT AND SODIUM ALUMINATE WITHIN THE RANGE OF 1.0% TO 2.5% BY WEIGHT, CALCULATED AS AL2O3, THEREBY PRECIPITATING ALUMINA IN HYDROUS FORM, THE RELATIVE PROPORTIONS OF SAID ALUMINUM SALT AND SODIUM ALUMINATE BEING SUFFICIENT TO PRODUCE A PH DURING SAID PRECIPITATION WITHIN THE RANGE OF ABOUT 9 TO ABOUT 10.5, CONTROLLING THE TEMPERATURE, CONCENTRATION OF AL2O3 AND PH WITHIN SAID RANGES TO PRODUCE A SLURRY OF ALUMINA WHICH WHEN FILTERED AND DRIED CONTAINS THE ALUMINA IN A CONTINUOUS PHASE GLASS-LIKE FORM, INCREASING THE CONCENTRATION OF THE ALUMINA SOLIDS IN THE SLURRY TO FROM 4% TO 7% BY WEIGHT AL2O3, AND SPRAY DRYING THE RESULTANT PRODUCT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |