US3198643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused cast refractory
Assignee: Corhart Refractories Co
•
Filing: 1962-07-27
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Granted: 1965-08-03
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Expires: 1982-07-27
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
- 👤 Frederick G Keihn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:40
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006; C; C04; C04B; C04B35/00; C04B35/01; C04B35/12; C04B35/42; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A FUSED CAST REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF, ANALYTICALLY BY WEIGHT, 40% TO 79% MGO, 4% TO 58% CR2O3, UP TO 30% AL2O3, UP TO 18.5% FEO, THE SUM OF MGO PLUR CR2O3 PLUS AL2O3 PLUS FEO BEING AT LEAST 82%, UP TO 5% SE2O3, UP TO 5% SIO2, UP TO 10% CAO, UP TO 7% FLUROINE AND 0.35% TO 10% TI2O3, WITH THE RATIO OF THEMOLS OF RO OXIDES TO THE SUM OF THE MOLS OF R2O3 OXIDES PLUS ONE-HALF THE MOLS OF SIO3 BEING AT LEAST 2.4.
Claim 2
Dependent Claim
89 words
A FUSED CAST REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF, ANALYTICALLY BY WEIGHT, 40% TO 79% MGO, 4% TO 58% CR2O3, UP TO 30% AL2O3, UP TO 18.5% FEO, THE SUM OF MGO PLUR CR2O3 PLUS AL2O3 PLUS FEO BEING AT LEAST 82%, UP TO 5% SE2O3, UP TO 5% SIO2, UP TO 10% CAO, UP TO 7% FLUROINE AND 0.35% TO 10% TI2O3, WITH THE RATIO OF THEMOLS OF RO OXIDES TO THE SUM OF THE MOLS OF R2O3 OXIDES PLUS ONE-HALF THE MOLS OF SIO3 BEING AT LEAST 2.4.
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |