US3203785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory linings for chambers for degasifying metals
Assignee: Dortmund Hoerder Huettenunion AG
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Filing: 1963-02-26
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Granted: 1965-08-31
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Expires: 1983-02-26
Abstract
No abstract record available.
Inventors
- 👤 Knuppel Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1678; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A METHOD OF INCREASING THE DURABILITY OF REFRACTORY LININGS COVERING THE INTERIOR OF VACUUM CHAMBERS FOR DEGASSING MOLTEN STEEL, THE STEPS OF, COVERING SAID LINING WITH A PULVERULENT MIXTURE OF ALUMINUM OXIDE AND SILICON DIOXIDE WHICH IS VISCOUS AT THE POURING TEMPERATURE OF MOLTEN STEEL, AND HEATING SAID VESSEL TO THE POURING TEMPERATURE OF MOLTEN STEEL WHEREUPON SAID COATING BECOMES VISCOUS.
Claim 2
Independent Claim
61 words
A METHOD OF INCREASING THE DURABILITY OF REFRACTORY LININGS COVERING THE INTERIOR OF VACUUM CHAMBERS FOR DEGASSING MOLTEN STEEL, THE STEPS OF, COVERING SAID LINING WITH A PULVERULENT MIXTURE OF ALUMINUM OXIDE AND SILICON DIOXIDE WHICH IS VISCOUS AT THE POURING TEMPERATURE OF MOLTEN STEEL, AND HEATING SAID VESSEL TO THE POURING TEMPERATURE OF MOLTEN STEEL WHEREUPON SAID COATING BECOMES VISCOUS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |