US3231369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making steel
Assignee: Kloeckner Werke AG
•
Filing: 1963-03-26
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Granted: 1966-01-25
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Expires: 1983-03-26
Abstract
No abstract record available.
Inventors
- 👤 Gorlich Hans Kurt
- 👤 Schwenke Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:35
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/562; C21C5/28; C21C5/42; F; F27; F27B; F27B3/00; F27B3/002; F27B3/04; F27B3/10; F27B3/18; F27D; F27D3/00; F27D2003/0034; F27D2003/0059; F27D3/16; F27D2003/162; F27D2003/163; F27D2003/164; F27D2003/168; F27D3/14; F27D5/00; F27D5/0068; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF MAKING STEEL, COMPRISING THE STEPS OF HEATING FERROUS SCRAP IN THE HEARTH OF AN OPEN-HEARTH FURNACE TO OBTAIN A POOL OF MOLTEN SCRAP; FORMING A SUPPLY OF MOLTEN PIG AT A POINT EXTERNALLY TO THE FURNACE; TAPPING THE FURNACE AND CONVEYING MOLTEN SCRAP FROM THE HEARTH INTO THE SUPPLY OF MOLTEN PIG TO FORM A MIXTURE OF PIG AND MOLTEN SCRAP; ADMITTING OXYGEN INTO SUCH MIXTURE WHEREBY THE MIXTURE EMITS HOT FUMES; AND CONVEYING THE FUMES ALONG THE POOL IN THE HEARTH SO THAT THE FUMES EXCHANGE HEAT WITH THE SCRAP.
Claim 2
Independent Claim
94 words
A METHOD OF MAKING STEEL, COMPRISING THE STEPS OF HEATING FERROUS SCRAP IN THE HEARTH OF AN OPEN-HEARTH FURNACE TO OBTAIN A POOL OF MOLTEN SCRAP; FORMING A SUPPLY OF MOLTEN PIG AT A POINT EXTERNALLY TO THE FURNACE; TAPPING THE FURNACE AND CONVEYING MOLTEN SCRAP FROM THE HEARTH INTO THE SUPPLY OF MOLTEN PIG TO FORM A MIXTURE OF PIG AND MOLTEN SCRAP; ADMITTING OXYGEN INTO SUCH MIXTURE WHEREBY THE MIXTURE EMITS HOT FUMES; AND CONVEYING THE FUMES ALONG THE POOL IN THE HEARTH SO THAT THE FUMES EXCHANGE HEAT WITH THE SCRAP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |