US2680099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of shaped alumina particles
Assignee: Universal Oil Products Co
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Filing: 1951-01-12
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Granted: 1954-06-01
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Expires: 1971-01-12
Abstract
No abstract record available.
Inventors
- 👤 Hoekstra James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:23
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; B01J21/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
IN A PROCESS FOR THE MANUFACTURE OF ALUMINA SPHERS WHEREIN AN ALUMINA SOL IS COMMINGLED WITH HEXAMETHYLENE TETRAMINE AND DROPLETS OF THE RESULTANT MIXTURE PASSED INTO A HYDROCARBON OIL MAINTAINED AT AN ELEVATED TEMPERATURE, AND THE RESULTANT HYDROGEL PARTICLES AGED IN AT LEAST A PORTION OF SAID HYDROCARBON OIL AT AN ELEVATED TEMPERATURE FOR AT LEAST 10 HOURS, THE IMPROVEMENT WHICH COMPRISES WITHDRAWING AT LEAST A PORTION OF SAID HYDROCARBON OIL FROM THE AGING STEP AND CONTACTING THE SAME FIRST WITH SILICAALUMINA AT A TEMPERATURE OF FROM ABOUT 200* TO ABOUT 400* F. AND THEN WITH ALUMINA AT A TEMPERATURE OF FROM ABOUT 200* TO ABOUT 400* F., AND SUPPLYING THE THUS TREATED OIL TO THE PROCESS FOR USE IN THE MANUFACTURE OF FURTHER ALUMINA SPHERES.
References Cited (Backward Citations)
US2284248A
Cited
US2288875A
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US2406420A
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US2400709A
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US2471000A
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US2529310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |