Patent US3272490A successfully refreshed from Google Patents.
US3272490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steelmaking furnace
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1963-09-25
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Granted: 1966-09-13
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Expires: 1983-09-25
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:14
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/44; C04; C04B; C04B35/00; C04B35/01; C04B35/12; C04B35/42; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A BASIC OXYGEN FURNACE COMPRISING A GENERALLY PEAR-SHAPED TANK, REFRACTORY LINING COVERING THE INTERNAL SURFACES OF SAID TANK AND MEANS FOR PROVIDING AN OXYGEN BLAST DIRECTED INTO SAID REFRACTORY LINED TANK, THE IMPROVEMENT COMPRISING A CHROME-MAGNESIA FUSED CAST REFRACTORY MATERIAL FORMING AT LEAST PART OF SAID REFRACTORY LINING AND HAVING A COMPOSITION CONSISTING OF, ANALYTICALLY BY WEIGHT, 40% TO 79% MGO, UP TO 20% FEO, 4% TO 58% CR2O3, UP TO 35% AL2O3, UP TO 10% TIO2, UP TO 5% SIO2, UP TO 3% CAO AND UP TO 5% FLUORINE.
Claim 2
Dependent Claim
91 words
IN A BASIC OXYGEN FURNACE COMPRISING A GENERALLY PEAR-SHAPED TANK, REFRACTORY LINING COVERING THE INTERNAL SURFACES OF SAID TANK AND MEANS FOR PROVIDING AN OXYGEN BLAST DIRECTED INTO SAID REFRACTORY LINED TANK, THE IMPROVEMENT COMPRISING A CHROME-MAGNESIA FUSED CAST REFRACTORY MATERIAL FORMING AT LEAST PART OF SAID REFRACTORY LINING AND HAVING A COMPOSITION CONSISTING OF, ANALYTICALLY BY WEIGHT, 40% TO 79% MGO, UP TO 20% FEO, 4% TO 58% CR2O3, UP TO 35% AL2O3, UP TO 10% TIO2, UP TO 5% SIO2, UP TO 3% CAO AND UP TO 5% FLUORINE.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |