US3608060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a foamed alumina shape or catalyst support
Assignee: CIT Group Business Credit Inc
•
Filing: 1968-09-20
•
Granted: 1971-09-21
•
Expires: 1988-09-20
Abstract
Abstract A hydrated alumina which has been calcined to reduce its loss on ignition to below 12 percent and which is capable of at least partial rehydration is mixed with water and a blowing agent to form a slurry. The slurry is heated to below 100* C. to activate the blowing agent causing bubbles to form in the slurry. The slurry is then poured into a mold and heated to cause the alumina to rehydrate stabilizing the foamed body which is then activated at 350*-700* C.
Inventors
- 👤 Harry E Osment
- 👤 Raymond L Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:47
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J35/00; B01J35/60; B01J35/61; B01J35/615; B01J21/00; B01J21/02; B01J21/04; B01J35/30; B01J35/31; B01J35/32; B01J37/00; B01J37/0009; B01J37/0018; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
24 words
The method of claim 1, wherein the finely divided alumina is admixed prior to partial rehydration with a portion of unground, selectively calcined alumina.
Claim 2
Dependent Claim
17 words
The method of claim 1, wherein the curing temperature is of from 70* to about 95* C.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the amount of water added to the finely divided alumina is sufficient to produce a free-flowing slurry.
Claim 4
Dependent Claim
23 words
The method of claim 1, wherein the agent capable of releasing bubbles is a gaseous substance at temperatures between 0* and 100* C.
Claim 5
Dependent Claim
29 words
The method of claim 5 wherein the gaseous substance is selected from the group consisting of air, nitrogen, carbon dioxide and chlorofluorocarbons having a boiling point below 0* C.
Claim 6
Dependent Claim
32 words
The method of claim 1, wherein the agent capable of releasing bubbles is a liquid having a boiling point within the temperature range of from about 0* C. to about 100* C.
Claim 7
Dependent Claim
29 words
The method of claim 7, wherein the liquid is selected from the group consisting of alcohols, ketones, ethers and chlorofluorocarbons having a boiling point between 0* and 100* C.
Claim 8
Dependent Claim
17 words
The method of claim 1, wherein the agent capable of releasing bubbles is a hydrogen peroxide solution.
Claim 9
Dependent Claim
20 words
The method of claim 9, wherein the hydrogen peroxide concentration in the solution is 0.1 to 15 percent by weight.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |