US4048134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory heat-insulating materials
Assignee: Foseco Trading AG
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Filing: 1976-02-05
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Granted: 1977-09-13
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Expires: 1996-02-05
Abstract
Abstract Lining slabs for prolonged contact with molten metals, e.g. for use in tundishes, are made from a refractory heat-insulating composition comprising by weight:
Inventors
- 👤 John Henry Courtenay
- 👤 Martin Bernard Peter Wardell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:09
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/02; C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/16; C04B35/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A refractory heat-insulating composition consisting essentially of, by weight: 1 to 11% fibrous material 4 to 8% synthetic resin binder and 80 to 95% a mixture of particulate magnesia and particulate olivine, the weight ratio of magnesia: olivine being from 1:10 to 4:1 and the composition containing not more than 4% by weight of cellulosic fibrous material and not more than 7% by weight refractory fibrous material.
Claim 2
Dependent Claim
67 words
A refractory heat-insulating composition consisting essentially of, by weight: 1 to 11% fibrous material 4 to 8% synthetic resin binder and 80 to 95% a mixture of particulate magnesia and particulate olivine, the weight ratio of magnesia: olivine being from 1:10 to 4:1 and the composition containing not more than 4% by weight of cellulosic fibrous material and not more than 7% by weight refractory fibrous material.
Claim 3
Dependent Claim
14 words
A refractory heat-insulating material according to claim 1, wherein the magnesia is dead-burnt magnesite.
Claim 4
Dependent Claim
31 words
A refractory heat-insulating composition according to claim 1, wherein the fibrous material is selected from the class consisting of aluminosilicate fibre, calcium silicate fibre, mineral wool, rock wool and slag wool.
Claim 5
Dependent Claim
25 words
A refractory heat-insulating composition according to claim 1 and containing refractory fibrous material in a proportion of 5 to 7% by weight of the composition.
Claim 6
Dependent Claim
30 words
A refractory heat-insulating composition according to claim 1, wherein the resin binder is selected from the class consisting of phenol- and urea-formaldehyde resins and mixtures of phenol- and urea-formaldehyde resins.
Claim 7
Dependent Claim
20 words
A refractory heat-insulating composition according to claim 1, wherein the weight ratio of magnesia : olivine is 4:6 to 6:4.
Claim 8
Dependent Claim
17 words
A refractory heat-insulating composition according to claim 1 and which contains less than 5% by weight FeO.
Claim 9
Dependent Claim
38 words
A composition according to claim 1 and comprising the following ingredients in the following proportions, by weight: magnesia: 42 - 45% olivine: 40 - 45% slag wool: 5 - 7% phenol-formaldehyde resin: about 3.5% urea-formaldehyde resin: about 2.5%.
Claim 10
Dependent Claim
12 words
A tundish lining slab formed of a composition according to claim 1.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |