US2707677A
Expired / Lapsed
US
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Method of making steel with a low nitrogen content by the converter process
Assignee: Huettenwerk Oberhausen AG
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Filing: 1952-03-27
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Granted: 1955-05-03
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Expires: 1972-03-27
Abstract
No abstract record available.
Inventors
- 👤 Rudolf F Graef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A METHOD OF MAKING STEEL WITH A LOW NITROGEN CONTENT BY APPLYING THE CONVERTER PROCESS, WHICH INCLUDES THE STEPS OF BLOWING A GASEOUS OXIDIZING AGENT WITH A CONSIDERABLE HIGHER OXYGEN CONCENTRATION THAN IN ORDINARY AIR INTO MOLTEN PIG IRON PRIOR TO CHARGING SAID MOLTEN PIG IRON INTO A BASIC BESSEMER CONVERTER, CONTINUING SAID BLOWING UNTIL THE SILICON CONTENT OF SAID PIG IRON HAS NEENM MATERIALLY REDUCED THEREBY PRE-REFINING SAID PIG IRON, CHARGING THE THUS PRE-REFINED PIG IRON INTO A BASIC BESSEMER CONVERTER, AND COMPLETING THE REFINING PROCESS BY BLOWING A GASEOUS OXIDIZING AGENT THROGUH SAID PREREFINED PIG IRON IN SAID BASIC BESSEMER CONVERTER.
Claim 2
Independent Claim
103 words
A METHOD OF MAKING STEEL WITH A LOW NITROGEN CONTENT BY APPLYING THE CONVERTER PROCESS, WHICH INCLUDES THE STEPS OF BLOWING A GASEOUS OXIDIZING AGENT WITH A CONSIDERABLE HIGHER OXYGEN CONCENTRATION THAN IN ORDINARY AIR INTO MOLTEN PIG IRON PRIOR TO CHARGING SAID MOLTEN PIG IRON INTO A BASIC BESSEMER CONVERTER, CONTINUING SAID BLOWING UNTIL THE SILICON CONTENT OF SAID PIG IRON HAS NEENM MATERIALLY REDUCED THEREBY PRE-REFINING SAID PIG IRON, CHARGING THE THUS PRE-REFINED PIG IRON INTO A BASIC BESSEMER CONVERTER, AND COMPLETING THE REFINING PROCESS BY BLOWING A GASEOUS OXIDIZING AGENT THROGUH SAID PREREFINED PIG IRON IN SAID BASIC BESSEMER CONVERTER.
References Cited (Backward Citations)
US1709389A
Cited
US2490990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |