US3773532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mullite-chrome refractory
Assignee: CHAS TAYLOR S SONS CO US
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Filing: 1972-07-13
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Granted: 1973-11-20
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Expires: 1992-07-13
Abstract
Abstract A new type of mullite brick refractory composition has been produced which contains from 56 to 80 percent mullite, from 6 to 13 percent calcined kyanite, from 5 to 8 percent alumina, from 1 to 9 percent silica and from 4 to 25 percent iron-chromite ore. This new refractory material has increased service life and decreased slag and alkali attack when used in the steel industry.
Inventors
- 👤 E Manigault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A method for producing a refractory composition of matter which comprises admixing from 56 to 80 Percent mullite, from 6 to 13 percent calcined kyanite, from 5 to 8 percent alumina, from 1 to 9 percent silica and from 4 to 25 percent iron-chromite ore, forming said mixture into a ceramic shaped body and firing said body at a temperature from 1,500*C to 1,650*C, all of the percentages expressed on a weight basis.
Claim 2
Dependent Claim
31 words
Method according to claim 2 in which the iron-chromite ore contains from 20 to 35 percent iron oxides, and from 20 to 45 percent oxides of silicon, magnesium, calcium and aluminum.
Claim 3
Dependent Claim
40 words
Method according to claim 2 in which the mullite is of a size from - 1/4 inch through -325 mesh, the calcined kyanite is -100 mesh and the iron-chromite ore, the alumina and the silica are -325 mesh in size.
References Cited (Backward Citations)
US3669889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |