US3759725A
Expired / Lapsed
US
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Refracotory articles for use with molten ferrous metals
Assignee: Morgan Refractories Ltd
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Filing: 1971-08-02
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Granted: 1973-09-18
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Expires: 1991-08-02
Abstract
Abstract ARTICLES, OR PARTS OF ARTICLES, WHICH IN USE ARE IN CONTACT WITH MOLTEN FERROUS METALS, ARE MADE FROM A MIXOF SILICON CARBIDE PARTICLES AND MORE FINELY-DIVIDED ALUMINA, WITH OR WITHOUT SILICA ADDITIONS PROVIDED BY FOR EXAMPLE ADDING CLAY, THE SHAPED ARTICLES BEING FIRED SO THAT THE ALUMINA COATS AND BONDES THE SILICON CARBIDE PARTICLES.
Inventors
- 👤 W Steen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/66
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |