US3293053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory and furnace lining
Assignee: Corhart Refractories Co
•
Filing: 1965-11-08
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Granted: 1966-12-20
•
Expires: 1985-11-08
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
- 👤 Robert N Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:40
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/44; C04; C04B; C04B35/00; C04B35/01; C04B35/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A FUSED CAST REFRACTORY CONSISTING OF, ANALYTICALLY BY WEIGHT, AT LEAST ABOUT 75% TO 89% MGO, ABOUT 11% TO 21% CAO, LESS THAN 5% FEO, AND LESS THAN 10% OF OTHER OXIDE SELECTED FROM THE GROUP CONSISTING OF LESS THAN 5% ALKALI METAL OXIDE, LESS THAN 5% RARE EARTH OXIDE, LESS THAN 3% P2O5, LESS THAN 1% THO2, LESS THAN 5% ZRO2. LESS THAN 5% SIO2, LESS THAN 5% B2O3, LESS THAN 5% AL2O3 AND LESS THAN 5% CR2O3.
Claim 2
Dependent Claim
79 words
A FUSED CAST REFRACTORY CONSISTING OF, ANALYTICALLY BY WEIGHT, AT LEAST ABOUT 75% TO 89% MGO, ABOUT 11% TO 21% CAO, LESS THAN 5% FEO, AND LESS THAN 10% OF OTHER OXIDE SELECTED FROM THE GROUP CONSISTING OF LESS THAN 5% ALKALI METAL OXIDE, LESS THAN 5% RARE EARTH OXIDE, LESS THAN 3% P2O5, LESS THAN 1% THO2, LESS THAN 5% ZRO2. LESS THAN 5% SIO2, LESS THAN 5% B2O3, LESS THAN 5% AL2O3 AND LESS THAN 5% CR2O3.
References Cited (Backward Citations)
US1954552A
Cited
US2798002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |