Patent US3600129A successfully refreshed from Google Patents.
US3600129A
Expired / Lapsed
US
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Manufacture of low bulk density high strength spherical alumina particles
Assignee: Universal Oil Products Co
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Filing: 1969-06-17
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Granted: 1971-08-17
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Expires: 1989-06-17
Abstract
Abstract LOW DENSITY ALUMINA SPHERES OF IMPROVED CRUSHING STRENGTH ARE PREPARED BY THE OIL-DROP METHOD UTILIZING A DROPPING MIXTURE COMPRISING AN ALUMINA SOL AND HEXAMETHYLENETETRAMINE, SAID DROPPING MIXTURE HAVING AN A1/C1 WEIGHT RATIO OF 1:1 TO 1.5:1, A HEXMETHYLENETETRAMINE/C1 MOL RATIO OF 1/4-1.25/4 AND AN A1 CONTENT OF 6-10 WT. PERCENT. AFTER DROPPING, THE SPHERES ARE PRESSSURE AGED AT A TEMPERATURE OF 240*-500*F. FOR 1-5 HOURS, AND ARE THEN WASHED, DRIED AND CALCINED.
Inventors
- 👤 Kenneth D Vesely
- 👤 Laurence R Steenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:48
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J35/00; B01J35/50; B01J35/51; C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2006/00; C01P2006/11; C01P2006/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |