US3140955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused cast refractory
Assignee: Cohart Refractories Co
•
Filing: 1961-11-24
•
Granted: 1964-07-14
•
Expires: 1981-11-24
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
- 👤 Robert N Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:31
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
48 words
A FUSED CAST REFRACTORY CONSISTING ESSENTIALLY OF, BY WEIGHT, 56% TO 85% MGO, 13% TO 40% AL2O3, THE SUM OF MGO PLUS AL2O3 BEING AT LEAST 90%, 0.4% TO 4.5% CR2O3, UP TO 3.5% FEO, UP TO 3% CAO, UP TO 3% SIO2 AND UP TO 0.5% B2O3.
Claim 2
Dependent Claim
48 words
A FUSED CAST REFRACTORY CONSISTING ESSENTIALLY OF, BY WEIGHT, 56% TO 85% MGO, 13% TO 40% AL2O3, THE SUM OF MGO PLUS AL2O3 BEING AT LEAST 90%, 0.4% TO 4.5% CR2O3, UP TO 3.5% FEO, UP TO 3% CAO, UP TO 3% SIO2 AND UP TO 0.5% B2O3.
References Cited (Backward Citations)
US2062962A
Cited
US2235077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |