US2789046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making steel from pig iron
Assignee: Vodafone GmbH
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Filing: 1955-02-01
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Granted: 1957-04-16
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Expires: 1975-02-01
Abstract
No abstract record available.
Inventors
- 👤 Speith Karl Georg
- 👤 Darmann Otto
- 👤 Ende Hans Vom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF MANUFACTURING STEEL WITH LOW PHOS PHORUS, NITROGEN , SULFUR AND OXYGEN CONTENTS, FROM A BATH OF LIQUID PIG IRON CONTAINING AT LEAST 0.5% PHOSPHOROUS, AND HAVING SLAG-FORMING INGREDIENTS ASSOCIATED THEREWITH IN SAID BATH, COMPRISING INITIALLY BLOWING SUBSTANTIALLY PURE OXYGEN AGAINST THE SURFACE OF THE BATH THROUGH A NOZZLE SPACED FROM THE SURFACE OF THE BATH A MINIMUM DISTANCE OF 20 INCHES, THE OXYGEN BEING SUPPLIED AT A RATE HIGH ENOUGH TO SUPPRESS FOAMING OF SLAG ON SAID BATH AND TO REACT WITH THE MOLTEN BATH IN COOPERATION WITH THE SLAG, THEREBY CAUSING SLAGGING OF THE PHOSPHORUS AND REDUCING IT TO A CONTENT OF ABOUT 0.2%, WHILE THE CARBON CONTENT REMAINS AT ABOUT 1.5%, AND THEREAFTER DECREASING THE OXYGEN SUPPLY RATE TO FURTHER REDUCE THE PHOSPHORUS AND CARBON CONTENT OF THE BATH WHILE MAINTAINING THE CARBON CONTENT GREATER THAN THE PHOSPHORUS CONTENT.
Claim 2
Independent Claim
144 words
A METHOD OF MANUFACTURING STEEL WITH LOW PHOS PHORUS, NITROGEN , SULFUR AND OXYGEN CONTENTS, FROM A BATH OF LIQUID PIG IRON CONTAINING AT LEAST 0.5% PHOSPHOROUS, AND HAVING SLAG-FORMING INGREDIENTS ASSOCIATED THEREWITH IN SAID BATH, COMPRISING INITIALLY BLOWING SUBSTANTIALLY PURE OXYGEN AGAINST THE SURFACE OF THE BATH THROUGH A NOZZLE SPACED FROM THE SURFACE OF THE BATH A MINIMUM DISTANCE OF 20 INCHES, THE OXYGEN BEING SUPPLIED AT A RATE HIGH ENOUGH TO SUPPRESS FOAMING OF SLAG ON SAID BATH AND TO REACT WITH THE MOLTEN BATH IN COOPERATION WITH THE SLAG, THEREBY CAUSING SLAGGING OF THE PHOSPHORUS AND REDUCING IT TO A CONTENT OF ABOUT 0.2%, WHILE THE CARBON CONTENT REMAINS AT ABOUT 1.5%, AND THEREAFTER DECREASING THE OXYGEN SUPPLY RATE TO FURTHER REDUCE THE PHOSPHORUS AND CARBON CONTENT OF THE BATH WHILE MAINTAINING THE CARBON CONTENT GREATER THAN THE PHOSPHORUS CONTENT.
References Cited (Backward Citations)
US1032653A
Cited
US2584152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |