US2622977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization of iron and iron alloys
Assignee: Individual
•
Filing: 1949-12-28
•
Granted: 1952-12-23
•
Expires: 1969-12-28
Abstract
No abstract record available.
Inventors
- 👤 Kalling Bo Michael Sture
- 👤 Danielsson Pehr Ake Christer
- 👤 Dragge Ottar Johan Lorens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:24
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A METHOD OF DESULFURIZING A METAL OF THE GROUP CONSISTING OF IRON AND IRON ALLOYS HAVING A MELTING POINT BELOW 1400* C. WHICH COMPRISES VIGOROUSLY STIRRING A MOLTEN METAL OF SAID GROUP IN A CLOSED RELATION CHAMBER IN CONTACT WITH A SOLID DEULFURIZING AGENT OF THE GROUP CONSISTING OF THE OXIDES OF THE ALKALINE EARTH METALS AND THE OXIDE MAGNESIUM IN FINE GRANULAR FORM AT A TEMPERATURE BELOW 1400* C. AT WHICH SAID METAL REMAINS IN THE MOLTEN STATE AND SAID DESULFURIZING AGENT REMAINS IN THE SOLID STATE WITHOUT SINTERING AND IN A NON-OXIDIZING ATMOSPHERE CONSISTING ESSENTIALLY OF A GAS OF THE GROUP CONSISTING OF NITROGEN ANDD HYDROGEN.
Claim 2
Independent Claim
108 words
A METHOD OF DESULFURIZING A METAL OF THE GROUP CONSISTING OF IRON AND IRON ALLOYS HAVING A MELTING POINT BELOW 1400* C. WHICH COMPRISES VIGOROUSLY STIRRING A MOLTEN METAL OF SAID GROUP IN A CLOSED RELATION CHAMBER IN CONTACT WITH A SOLID DEULFURIZING AGENT OF THE GROUP CONSISTING OF THE OXIDES OF THE ALKALINE EARTH METALS AND THE OXIDE MAGNESIUM IN FINE GRANULAR FORM AT A TEMPERATURE BELOW 1400* C. AT WHICH SAID METAL REMAINS IN THE MOLTEN STATE AND SAID DESULFURIZING AGENT REMAINS IN THE SOLID STATE WITHOUT SINTERING AND IN A NON-OXIDIZING ATMOSPHERE CONSISTING ESSENTIALLY OF A GAS OF THE GROUP CONSISTING OF NITROGEN ANDD HYDROGEN.
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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) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |