US2690974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrome-magnesia refractories
Assignee: Saint Gobain Ceramics and Plastics Inc
•
Filing: 1952-04-16
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Granted: 1954-10-05
•
Expires: 1972-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Ralph Joseph Magri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:56
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/12; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A FUSED REFRACTORY MATERIAL COMPRISING A CHROME-CONTAINING SPINEL AND PERICLASE, SAID REFRACTORY MATERIAL ANALYTICALLY CONTAINING 1% BUT LESS THAN 5% FEO, 40 TO 78% MGO, 5 TO 45% AL2O3, AND 5 TO 50% CR2O3, THE TOTAL OF SUCH OXIDES AMOUNTING TO AT LEAST 87%, THE RATIO OF THE MOLS OF FEO AND MGO TO THE MOLS OF AL2O3 AND CR2O3 BEING BETWEEN 2.4 AND 10.
Claim 2
Dependent Claim
65 words
A FUSED REFRACTORY MATERIAL COMPRISING A CHROME-CONTAINING SPINEL AND PERICLASE, SAID REFRACTORY MATERIAL ANALYTICALLY CONTAINING 1% BUT LESS THAN 5% FEO, 40 TO 78% MGO, 5 TO 45% AL2O3, AND 5 TO 50% CR2O3, THE TOTAL OF SUCH OXIDES AMOUNTING TO AT LEAST 87%, THE RATIO OF THE MOLS OF FEO AND MGO TO THE MOLS OF AL2O3 AND CR2O3 BEING BETWEEN 2.4 AND 10.
References Cited (Backward Citations)
US2358652A
Cited
US2599566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |