US3919117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing alumina spheres
Assignee: Universal Oil Products Co
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Filing: 1974-03-18
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Granted: 1975-11-11
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Expires: 1994-03-18
Abstract
Abstract A method of preparing alumina spheres of improved halogen capacity. Alumina spheres, prepared by the oil drop method, are aged in an aqueous ammonium carbonate solution, and dried and calcined to increase the halogen capacity thereof.
Inventors
- 👤 Edward Michalko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:50
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J35/00; B01J35/50; B01J35/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
IN THE PREPARATION OF ALUMINA SPHERES WHEREIN AN ACIDIC ALUMINA SOL IS DISPERSED AS DROPLETS IN A HOT OIL BATH IN WHICH THE SOL DROPLETS ARE GELLED AND AGED, THE IMPROVEMENT OF REMOVING THE AGED SPHERES FROM THE OIL BATH AND THEN FURTHER AGING THE SAME IN AN AQUEOUS AMMONIUM CARBONATE SOLUTION AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 50*C., AND THEREAFTER WASHING, DRYING AND CALCINING THE ALUMINA SPHERE.
Claim 2
Dependent Claim
71 words
IN THE PREPARATION OF ALUMINA SPHERES WHEREIN AN ACIDIC ALUMINA SOL IS DISPERSED AS DROPLETS IN A HOT OIL BATH IN WHICH THE SOL DROPLETS ARE GELLED AND AGED, THE IMPROVEMENT OF REMOVING THE AGED SPHERES FROM THE OIL BATH AND THEN FURTHER AGING THE SAME IN AN AQUEOUS AMMONIUM CARBONATE SOLUTION AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 50*C., AND THEREAFTER WASHING, DRYING AND CALCINING THE ALUMINA SPHERE.
Claim 3
Dependent Claim
16 words
The method of claim 1 further characterized in that said alumina sol is commingled with hexamethylenetetramine.
Claim 4
Dependent Claim
26 words
The method of claim 2 further characterized in that said hexamethylenetetramine is utilized in an amount to effect substantially complete neutralization of said acidic alumina sol.
Claim 5
Dependent Claim
25 words
The method of claim 1 further characterized in that said oil bath is maintained at a temperature of from about 50* to about 105* C.
Claim 6
Dependent Claim
25 words
The method of claim 1 further characterized in that said spheres are oil aged at a temperature of from about 50* to about 105* C.
Claim 7
Dependent Claim
24 words
The method of claim 1 further characterized in that said spheres are calcined at a temperature of from about 425* to about 750* C.
References Cited (Backward Citations)
US2544869A
Cited
US2620314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |