US3098739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining metals
Assignee: Huettenwerk Oberhausen AG
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Filing: 1960-11-04
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Granted: 1963-07-23
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Expires: 1980-11-04
Abstract
No abstract record available.
Inventors
- 👤 Graef Rudolf
- 👤 Bogdandy Ludwig Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:26
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/28; C21C5/30; C21C5/32; F; F27; F27B; F27B7/00; F27B7/20; F27B7/2083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
IN A METHOD OF REFINING CARBON CONTAINING PIG IRON IN THE PRESENCE OF AN OXYGEN CONTAINING ATMOSPHERE IN A DRUM FURNACE ROTATABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS AND ADAPTED TO RETAIN PIG IRON TO BE REFINED THROUGHOUT THE REFINING PROCESS, THE EMPLOYMENT OF THE FOLLOWING STEPS; FORMING A LIQUID SLAG LAYER, FEEDING IN SUCCESSION NEW QUANTITTIES OF SLAG FORMERS INTO SAID DRUM FURNACE AT ONE PORTION THEREOF WHILE THE REFINING PROCESS IS BEING CARRIED OUT, AND DURING SAID REFINING PROCESS, CORRESPONDING TO THE FEEDING OF NEW SLAG FORMERS INTO SAID DRUM FURNACE AND AT THE SAME RATE THEREOF AT AOTHER DRUM FURNACE PORTION SPACED FROM SAID FIRST DRUM FURNACE PORTION WITHDRAWING SLAG FROM THE SLAG LAYER FORMING ON THE PIG IRON BATH IN SAID DRUM FURNACE WHILE MAINTAINING THE SLAG LAYER FORMING ON THE PIG IRON BATH AT A DESIRED THINNESS WHEREBY THE AREA OF CONTACT OF SAID SLAG WITH THE FURNACE LINING IS REDUCED, AND WHILE RETAINING THE PIG IRON BATH IN SAID DRUM FURNACE UNTIL THE DESIRED REFINING OF SAID PIG IRON BATH IN SAID DRUM FURNACE HAS BEEN COMPLETED.
Claim 2
Dependent Claim
182 words
IN A METHOD OF REFINING CARBON CONTAINING PIG IRON IN THE PRESENCE OF AN OXYGEN CONTAINING ATMOSPHERE IN A DRUM FURNACE ROTATABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS AND ADAPTED TO RETAIN PIG IRON TO BE REFINED THROUGHOUT THE REFINING PROCESS, THE EMPLOYMENT OF THE FOLLOWING STEPS; FORMING A LIQUID SLAG LAYER, FEEDING IN SUCCESSION NEW QUANTITTIES OF SLAG FORMERS INTO SAID DRUM FURNACE AT ONE PORTION THEREOF WHILE THE REFINING PROCESS IS BEING CARRIED OUT, AND DURING SAID REFINING PROCESS, CORRESPONDING TO THE FEEDING OF NEW SLAG FORMERS INTO SAID DRUM FURNACE AND AT THE SAME RATE THEREOF AT AOTHER DRUM FURNACE PORTION SPACED FROM SAID FIRST DRUM FURNACE PORTION WITHDRAWING SLAG FROM THE SLAG LAYER FORMING ON THE PIG IRON BATH IN SAID DRUM FURNACE WHILE MAINTAINING THE SLAG LAYER FORMING ON THE PIG IRON BATH AT A DESIRED THINNESS WHEREBY THE AREA OF CONTACT OF SAID SLAG WITH THE FURNACE LINING IS REDUCED, AND WHILE RETAINING THE PIG IRON BATH IN SAID DRUM FURNACE UNTIL THE DESIRED REFINING OF SAID PIG IRON BATH IN SAID DRUM FURNACE HAS BEEN COMPLETED.
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) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |