Patent US4680279A successfully refreshed from Google Patents.
US4680279A
Expired / Lapsed
US
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Abrasion resistant refractory composition
Assignee: Indresco Inc
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Filing: 1986-02-24
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Granted: 1987-07-14
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Expires: 2006-02-24
Abstract
Abstract A refractory composition characterized by relatively high abrasion resistance, good flowability and long working time, comprised of 0.5 to 5 weight percent volatilized silica, 3.0 to 15 weight percent -65 mesh alumina, 20-40 weight percent cement, and the balance a refractory aggregate. Better results are obtained with a composition comprised of from 30-40 weight percent cement.
Inventors
- 👤 Thomas R. Kleeb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14; C04B35/10; C04B35/101; C04B35/66
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
A refractory composition consisting essentially of 0.5 to 5 weight percent volatilized silica; 3.0 to 15 weight percent -65 mesh alumina; 20 to 40 weight percent calcium aluminate cement; and the balance a refractory consisting essentially of a fire clay aggregate.
Claim 2
Dependent Claim
41 words
A refractory composition consisting essentially of 0.5 to 5 weight percent volatilized silica; 3.0 to 15 weight percent -65 mesh alumina; 20 to 40 weight percent calcium aluminate cement; and the balance a refractory consisting essentially of a fire clay aggregate.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein calcium aluminate cement is present in from 30 to 40 weight percent.
Claim 4
Dependent Claim
17 words
The composition of claims 1 or 2 including water for using the composition as a refractory castable.
Claim 5
Dependent Claim
22 words
The composition in accordance with claim 2 wherein the refractory aggregate includes 4. 5 to 12 weight percent -65 mesh calcined clay.
Claim 6
Dependent Claim
17 words
The composition in accordance with claim 4 wherein the -65 mesh alumina comprises substantially 8 weight percent.
Claim 7
Dependent Claim
16 words
The composition in accordance with claim 5 wherein the volatilized silica comprises substantially 2 weight percent.
References Cited (Backward Citations)
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US4236931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |