US3771998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and converter for refining pig iron
Assignee: Kloeckner CRA Technologie GmbH
•
Filing: 1969-05-05
•
Granted: 1973-11-13
•
Expires: 1989-05-05
Abstract
Abstract THE INVENTION RELATES TO A METHOD OF REFINING PIG IRON, PARTICULARLY WITH A HIGH PHOSPHORUS COMPONENT, IN A BOTTOM BLOWN CONVERTER IN WHICH OXYGEN MIXED WITH POWDERED LIME IS BLOWN INTO THE MELT THROUGH THE BOTTOM OF THE CONVERTER. ACCORDING TO THE INVENTION THE JETS OF OXYGEN MIXED WITH SUSPENDED POWDERED LIME BLOWN INTO THE MELT THROUGH THE BOTTOM OF THE CONVERTER ARE PROTECTED BY A SURROUNDING SHEATH OF A JACKET GAS WHICH IS PREFERABLY INERT OR SLOW TO REACT WITH THE MELT.
Inventors
- 👤 H Knuppel
- 👤 K Brotzmann
- 👤 H Fassbinder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:34
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/34; C21C5/42; C21C5/46; C21C5/48
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |