US3323907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of chromium steels
Assignee: Air Products and Chemicals Inc
•
Filing: 1964-11-23
•
Granted: 1967-06-06
•
Expires: 1984-11-23
Abstract
No abstract record available.
Inventors
- 👤 Edward F Kurzinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:04
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/005; C21C5/28; C21C5/30; C21C5/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE METHOD FOR PRODUCING FERRO-ALLOYS WHICH COMPRISES: CHARGING CHROME-BEARING STEEL SCRAP TO A CONVERTER-TYPE VESSEL, HEATING SAID SCRAP RAPIDLY WITH AT LEAST ONE OXY-FUEL LANCE TO A TEMPERATURE OF AT LEAST 2400*F. WITH MINIMUM OXIDATION, CHARGING MOLTEN BLAST FURNACE IRON CONTAINING SILICON TO THE RESULTING MOLTEN METAL BATH IN THE CONVERTER-TYPE VESSEL TO EFFECT REDUCTION OF CHROME OXIDE FORMED DURING THE HEATING OF THE CHROME-BEARING STEEL SCRAP, AND INCREASING THE TEMPERATURE OF THE MOLTEN METAL BATH TO AT LEAST 2800*F. BY THE INJECTION OF AT LEAST OXYGEN INTO THE CONVERTER VESSEL THEREBY EFFECTING REDUCTION OF REMAINING IMPURITIES IN THE MELT.
Claim 2
Independent Claim
100 words
THE METHOD FOR PRODUCING FERRO-ALLOYS WHICH COMPRISES: CHARGING CHROME-BEARING STEEL SCRAP TO A CONVERTER-TYPE VESSEL, HEATING SAID SCRAP RAPIDLY WITH AT LEAST ONE OXY-FUEL LANCE TO A TEMPERATURE OF AT LEAST 2400*F. WITH MINIMUM OXIDATION, CHARGING MOLTEN BLAST FURNACE IRON CONTAINING SILICON TO THE RESULTING MOLTEN METAL BATH IN THE CONVERTER-TYPE VESSEL TO EFFECT REDUCTION OF CHROME OXIDE FORMED DURING THE HEATING OF THE CHROME-BEARING STEEL SCRAP, AND INCREASING THE TEMPERATURE OF THE MOLTEN METAL BATH TO AT LEAST 2800*F. BY THE INJECTION OF AT LEAST OXYGEN INTO THE CONVERTER VESSEL THEREBY EFFECTING REDUCTION OF REMAINING IMPURITIES IN THE MELT.
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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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |