Patent US3578473A successfully refreshed from Google Patents.
US3578473A
Expired / Lapsed
US
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Basic fused refractory with rare earth oxide
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1968-05-17
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Granted: 1971-05-11
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Expires: 1988-05-17
Abstract
Abstract BASIC FUSED REFRACTORY MATERIAL ANALYTICALLY COMPOSED OF, BY WEIGHT, AT LEAST 70% MGO, 1 TO 25% RARE EARTH OXIDE, 3 TO 20% FEO, 0 TO LESS THAN 15% OF TIO2, ZRO2, CR2O3 AND MIXTURES THEREOF, 0 TO LESS THAN 10% OF SIO2, AL2O3, B2O3, FLUORINE AND MIXTURES THEREOF, 0 TO 3.5% P2O5, AND 0 TO 3% THO2. MATERIAL CAN BE IN FORM OF EITHER FUSED CAST ARTICLES OR FUSED GRAIN OR REBONDED FUSED GRAIN ARTICLE.
Inventors
- 👤 Allen M Alper
- 👤 Robert N Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03
Claims Analysis
Total Claims: 0
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |