US2750280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for rapidly desulfurizing steel
Assignee: Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
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Filing: 1952-01-15
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Granted: 1956-06-12
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Expires: 1972-01-15
Abstract
No abstract record available.
Inventors
- 👤 Perrin Rene
- 👤 Lamberton Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR DESULPHURIZING STEEL PRACTICALLY INSTANTANEOUSLY, WHICH COMPRISES ADDING TO A STEEL BATH A REDUCING AGENT OF THE GROUP CONSISTING OF SILICON AND ALUMINUM, POURING A STREAM OF THE MOLTEN STEEL INTO A LADLE AND ADDING PARTICLES OF SLAG IN A SOLID STATE TO THE STREAM DURING THE POURING OPERATION, SAID SLAG CONTAINING AS PRINCIPAL CONSTITUENTS A PREVIOUSLY REACTED MIXTURE OF FLUORSPAR AND LIME IN THE PROPORTIONS BY WEIGHT OF 6085% FLUORSPAR AND 15-40% LIME, SAID SLAG CONTAINING NOT OVER 10% BY WEIGHT OF ACIDIC CONSTITUENTS CAPABLE OF COMBINING WITH THE LIME IN THE SLAG, SAID PARTICLES OF SLAG MELTING SUBSTANTIALLY COMPLETELY WHEN ADDED TO THE POURING STREAM OF STEEL.
Claim 2
Dependent Claim
111 words
A PROCESS FOR DESULPHURIZING STEEL PRACTICALLY INSTANTANEOUSLY, WHICH COMPRISES ADDING TO A STEEL BATH A REDUCING AGENT OF THE GROUP CONSISTING OF SILICON AND ALUMINUM, POURING A STREAM OF THE MOLTEN STEEL INTO A LADLE AND ADDING PARTICLES OF SLAG IN A SOLID STATE TO THE STREAM DURING THE POURING OPERATION, SAID SLAG CONTAINING AS PRINCIPAL CONSTITUENTS A PREVIOUSLY REACTED MIXTURE OF FLUORSPAR AND LIME IN THE PROPORTIONS BY WEIGHT OF 6085% FLUORSPAR AND 15-40% LIME, SAID SLAG CONTAINING NOT OVER 10% BY WEIGHT OF ACIDIC CONSTITUENTS CAPABLE OF COMBINING WITH THE LIME IN THE SLAG, SAID PARTICLES OF SLAG MELTING SUBSTANTIALLY COMPLETELY WHEN ADDED TO THE POURING STREAM OF STEEL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |