US3259486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining pig iron
Assignee: Stora Enso Oyj
•
Filing: 1963-06-03
•
Granted: 1966-07-05
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Expires: 1983-06-03
Abstract
No abstract record available.
Inventors
- 👤 Kootz Theodor
- 👤 Maas Heinz
- 👤 Bengtsson Erik Axel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
METHOD FOR REFINING PIG IRON TTO STEEL WHICH COMPRISES SUBSTANTIALLY CONTINUOUSLY BLOWING A GASEOUS OXYGEN CARRIER ON TO A BATH OF MOLTEN PIG IRON AND SLAG MAINTAINED IN NATURAL VIBRATION IN A MELTING CONTAINER OF ROUND CROSS SECTION BY EXTERIOR MEANS, SAID VIBRATION BEING SUFFICIENT TO CAUSE INTERMIXING OF THE SURFACE LAYERS OF THE BATH, MAINTANING THE SLAG IN SUBSTAITNALLY SOLID STATE DURING THE MAJOR PORTION OF THE BLOWING PERIOD AND UNTIL A SHORT TIME BEFORE ATTAINING THAT CARBON CONTENT AT WHICH THE BLOWING IS TO BE ENDED, LIQUIFYING SAID SLAG AND SHORTLY THREAFTER ENDING SAID BLOWING.
Claim 2
Dependent Claim
97 words
METHOD FOR REFINING PIG IRON TTO STEEL WHICH COMPRISES SUBSTANTIALLY CONTINUOUSLY BLOWING A GASEOUS OXYGEN CARRIER ON TO A BATH OF MOLTEN PIG IRON AND SLAG MAINTAINED IN NATURAL VIBRATION IN A MELTING CONTAINER OF ROUND CROSS SECTION BY EXTERIOR MEANS, SAID VIBRATION BEING SUFFICIENT TO CAUSE INTERMIXING OF THE SURFACE LAYERS OF THE BATH, MAINTANING THE SLAG IN SUBSTAITNALLY SOLID STATE DURING THE MAJOR PORTION OF THE BLOWING PERIOD AND UNTIL A SHORT TIME BEFORE ATTAINING THAT CARBON CONTENT AT WHICH THE BLOWING IS TO BE ENDED, LIQUIFYING SAID SLAG AND SHORTLY THREAFTER ENDING SAID BLOWING.
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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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |