US2911313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused cast refractory articles and method of making them
Assignee: Unifrax I LLC
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Filing: 1956-11-16
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Granted: 1959-11-03
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Expires: 1976-11-16
Abstract
No abstract record available.
Inventors
- 👤 Karl H Sandmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:56
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/12; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A FUSED CAST REFRACTORY ARTICLE CONTAINING BY OXIDE ANALYSIS FROM 8 TO 50% CHROMIUM OXIDE DERIVED FROM CHROMITE ORE, SAID ARTICLE HAVING BEEN FORMED FROM A CHROMITE ORE-CONTAINING FUSION SELECTED FROM THE GROUP CONSISTING OF A FUSION OF CHROMITE ORE ALONE, CHROMEITE ORE AND ALUMINA, AND CHROMITE ORE AND MAGNESIA, SAID ARTICLE HAVING A BULK DENSITY OF BETWEEN 3.40 AND 3.85, SAID ARTICLE IN THE AS-CAST CONDITION HAVING A DENSE, NON-POROUS CRYSTALLINE STRUCTURE EXCEPT FOR THE LOCALIZED SHRINKAGE CAVITY THEREOF.
Claim 2
Dependent Claim
80 words
A FUSED CAST REFRACTORY ARTICLE CONTAINING BY OXIDE ANALYSIS FROM 8 TO 50% CHROMIUM OXIDE DERIVED FROM CHROMITE ORE, SAID ARTICLE HAVING BEEN FORMED FROM A CHROMITE ORE-CONTAINING FUSION SELECTED FROM THE GROUP CONSISTING OF A FUSION OF CHROMITE ORE ALONE, CHROMEITE ORE AND ALUMINA, AND CHROMITE ORE AND MAGNESIA, SAID ARTICLE HAVING A BULK DENSITY OF BETWEEN 3.40 AND 3.85, SAID ARTICLE IN THE AS-CAST CONDITION HAVING A DENSE, NON-POROUS CRYSTALLINE STRUCTURE EXCEPT FOR THE LOCALIZED SHRINKAGE CAVITY THEREOF.
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) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |