US3983197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alumina extrudates
Assignee: Universal Oil Products Co
•
Filing: 1973-09-24
•
Granted: 1976-09-28
•
Expires: 1993-09-24
Abstract
Abstract A method of preparing alumina extrudate particles. Finely divided alumina is admixed with from about 2 to about 10 wt. % alumina hydrosol and sufficient water added thereto to produce a dough extrudable at less than about 150 psig. The mixture is then extruded, dried and calcined. The alumina hydrosol functions as a source of alumina as well as a binder and/or lubricant, and obviates the need of extraneous binders or lubricants. The method is particularly useful to produce extruded particles of low average bulk density.
Inventors
- 👤 Roy T. Mitsche
- 👤 Hillard L. Kuntz
- 👤 John C. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:37
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/28; B01J2/20; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A method of preparing alumina extrudate particles which comprises: a. forming a mixture consisting essentially of a finely divided alumina and from about 2 to about 10 wt. % alumina hydrosol, and adding sufficient water thereto to produce a dough extrudable at less than about 150 psig.; b. extruding the resulting dough; and
Claim 2
Independent Claim
53 words
A method of preparing alumina extrudate particles which comprises: a. forming a mixture consisting essentially of a finely divided alumina and from about 2 to about 10 wt. % alumina hydrosol, and adding sufficient water thereto to produce a dough extrudable at less than about 150 psig.; b. extruding the resulting dough; and
Claim 3
Dependent Claim
13 words
The method of claim 1 further characterized in that said alumina has a
Claim 4
Dependent Claim
29 words
The method of claim 1 further characterized in that said alumina has a loss on ignition at 900° C. of from about 20 wt. % to about 30 wt.
Claim 5
Dependent Claim
28 words
The method of claim 1 further characterized in that said extrudate is calcined at a temperature of from about 350° to about 850° C. in an oxidizing atmosphere.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |