US3337353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mgo-b2o3 fused cast refractory
Assignee: Corhart Refractories Co
•
Filing: 1966-01-25
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Granted: 1967-08-22
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Expires: 1986-01-25
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
- 👤 Robert N Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A FUSED CAST REFRACTORY CONSISTING OF, ANALYTICALLY BY WEIGHT, 1 TO 20% B2O3, 0 TO 15% FEO, 0 TO 5% SIO2, 0 TO 3% OF AL2O3 AND MIXTURES THEREOF, AND THE BALANCE BEING MGO IN AN AMOUNT OF AT LEAST 80% PLUS OTHER INCIDENTAL IMPURITIES.
Claim 2
Dependent Claim
45 words
A FUSED CAST REFRACTORY CONSISTING OF, ANALYTICALLY BY WEIGHT, 1 TO 20% B2O3, 0 TO 15% FEO, 0 TO 5% SIO2, 0 TO 3% OF AL2O3 AND MIXTURES THEREOF, AND THE BALANCE BEING MGO IN AN AMOUNT OF AT LEAST 80% PLUS OTHER INCIDENTAL IMPURITIES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |