US3099552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making low sulfur steel
Assignee: General Electric Co
•
Filing: 1958-10-21
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Granted: 1963-07-30
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Expires: 1978-10-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Landig
- 👤 Allan J Kiesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:47
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
THE METHOD OF PRODUCING STEEL CONTAINING LESS THAN 0.005% SULFUR WHICH COMPRISES THE STEPS OF MELTING DOWN WITH LINE A STEEL CONTAINING MORE THAN 0.015% SULFUR AND AMOUNTS OF PHOSPHOROUS, SILICON, AND MANGANESE GREATER THAN DESIRED IN THE FINAL STEEL PRODUCT, SEPARATING AND REMOVING FROM THE RESULTING METAL MELT THE RESULTING SLAG WHEN THE PHOSPHORUS CONTENT OF THE METAL MELT HAS BEEN REDUCED TO A PREDETERMINED LEVEL, FORMING A SECOND SLAG ON THE METAL MELT BY ADDING TO THE METAL MELT TWO PARTS OF LIME, ONE PART OF MEXICAN GRAPHITE AND ONE PART OF FINE SILICON, MIXING THE SECOND SLAG WITH THE METAL MELT, SPEARATING AND REMOVING THE SECOND SLAG FROM THE METAL MELT WHEN THE SULFUR CONTENT OF THE SAID MELT HAS BEEN REDUCED TO LESS THAN 0.005%, AND THEN OXIDIZING MANAGANESE AND SILICON IN THE METAL MELT BY BLOWING THE MELT WITH A FREE OXYGEN-CONTAINING GAS, AND DISCONTINUING THE BLOWING OF THE MOLT WHEN THE AMOUNTS OF MANGENESE AND SILICON IN THE METAL BEEN REDUCED TO THE DESIRED LEVELS.
Claim 2
Independent Claim
171 words
THE METHOD OF PRODUCING STEEL CONTAINING LESS THAN 0.005% SULFUR WHICH COMPRISES THE STEPS OF MELTING DOWN WITH LINE A STEEL CONTAINING MORE THAN 0.015% SULFUR AND AMOUNTS OF PHOSPHOROUS, SILICON, AND MANGANESE GREATER THAN DESIRED IN THE FINAL STEEL PRODUCT, SEPARATING AND REMOVING FROM THE RESULTING METAL MELT THE RESULTING SLAG WHEN THE PHOSPHORUS CONTENT OF THE METAL MELT HAS BEEN REDUCED TO A PREDETERMINED LEVEL, FORMING A SECOND SLAG ON THE METAL MELT BY ADDING TO THE METAL MELT TWO PARTS OF LIME, ONE PART OF MEXICAN GRAPHITE AND ONE PART OF FINE SILICON, MIXING THE SECOND SLAG WITH THE METAL MELT, SPEARATING AND REMOVING THE SECOND SLAG FROM THE METAL MELT WHEN THE SULFUR CONTENT OF THE SAID MELT HAS BEEN REDUCED TO LESS THAN 0.005%, AND THEN OXIDIZING MANAGANESE AND SILICON IN THE METAL MELT BY BLOWING THE MELT WITH A FREE OXYGEN-CONTAINING GAS, AND DISCONTINUING THE BLOWING OF THE MOLT WHEN THE AMOUNTS OF MANGENESE AND SILICON IN THE METAL BEEN REDUCED TO THE DESIRED LEVELS.
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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) | 1966-07-29 | 1967-01-28 | 1967-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-29 | 1971-01-28 | 1971-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-29 | 1975-01-28 | 1975-07-30 | $7700.00 | Window Closed / Lapsed |