US4391918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic foam filter and aqueous slurry for making same
Assignee: First Union National Bank of North Carolina
•
Filing: 1982-02-19
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Granted: 1983-07-05
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Expires: 2002-02-19
Abstract
Abstract The present invention resides in an improved ceramic foam filter particularly useful for filtering molten metal and also an improved aqueous slurry for use in preparing same.
Inventors
- 👤 Jerry W. Brockmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:01
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B38/00; C04B38/06; C04B38/0615; C22; C22B; C22B21/00; C22B21/06; C22B21/066; C22B9/00; C22B9/02; C22B9/023; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
38 words
An aqueous slurry for use in preparing a ceramic foam having the following composition: 55 to 70% Al 2 O 3 , 2 to 10% micron-sized reactive alumina, 1 to 5% montmorillonite and 1 to 10% ceramic fibers.
Claim 2
Dependent Claim
38 words
An aqueous slurry for use in preparing a ceramic foam having the following composition: 55 to 70% Al 2 O 3 , 2 to 10% micron-sized reactive alumina, 1 to 5% montmorillonite and 1 to 10% ceramic fibers.
Claim 3
Dependent Claim
23 words
A slurry according to claim 1 containing from 2.5 to 25% of an air setting agent which is substantially nonreactive to molten metal.
Claim 4
Dependent Claim
16 words
A slurry according to claim 1 containing from 60 to 65% Al 2 O 3 .
Claim 5
Dependent Claim
14 words
A slurry according to claim 1 containing from 2 to 5% micron-sized reactive alumina.
Claim 6
Dependent Claim
13 words
A slurry according to claim 1 containing from 1 to 3% ceramic fibers.
Claim 7
Dependent Claim
13 words
A slurry according to claim 5 wherein said ceramic fibers are alumina-silicate fibers.
Claim 8
Dependent Claim
14 words
A slurry according to claim 2 wherein said air setting agent is aluminum orthophosphate.
Claim 9
Dependent Claim
13 words
A slurry according to claim 7 containing from 15 to 25% aluminum orthophosphate.
References Cited (Backward Citations)
US3547664A
Cited
US4342664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |