US2864689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of successively desulphurizing and desiliconizing a bath of pig iron
Assignee: Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
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Filing: 1957-07-02
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Granted: 1958-12-16
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Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 Perrin Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:11
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A PROCESS OF SUCCESSIVELY DESULPHURIZING AND DESILICONIZING A BATH OF PIG IRON, WHICH COMPRISES BLOWING THE BATH BY MEANS OF SIDE BLOWING OR THROUGH THE BOTTOM OF THE APPARATUS CONTAINING THE PIG IRON WITH A GAS WHICH IS NON-OXIDIZING WITH RESPECT TO SILICON AT THE TEMPERATURE OF THE BATH AND CARRIES ENTRAINED LIME, THEREBY FORMING A LAYER OF SULPHUR-CONTAINING LIME ON THE SURFACE OF THE BATH, AND THEREAFTER, WITHOUT REMOVING THE LAYER OF SULPHUR-CONTAINING LIME, BLOWING THE BATH BY MEANS OF SIDE BLOWING OR THROUGH THE BOTTOM OF THE APPARATUS CONTAINING THE PIG IRON WITH A GAS WHICH IS OXIDIZING WITH RESPECT TO SILICON AT THE TEMPERATURE OF THE BATH, THEREBY FORMING GLOBULES OF MANGANESE AND IRON SILICATES WHICH RISE IN THE BATH AND FORM A LAYER OF SLAG BELOW THE LAYER OF LIME, THE OXIDIZING GAS EMPLOYED BEING LIMITED TO SUCH AN AMOUNT AND BEING FED AT SUCH A RATE THAT THERE IS NO VIOLENT STIRRING OF THE BATH AND THE GAS IS SUBSTANTIALLY ENTIRELY ABSORBED BY THE BATH SO THAT SUBSTANTIALLY NO GAS BUBBLES REACH THE SURFACE OF THE BATH.
Claim 2
Dependent Claim
182 words
A PROCESS OF SUCCESSIVELY DESULPHURIZING AND DESILICONIZING A BATH OF PIG IRON, WHICH COMPRISES BLOWING THE BATH BY MEANS OF SIDE BLOWING OR THROUGH THE BOTTOM OF THE APPARATUS CONTAINING THE PIG IRON WITH A GAS WHICH IS NON-OXIDIZING WITH RESPECT TO SILICON AT THE TEMPERATURE OF THE BATH AND CARRIES ENTRAINED LIME, THEREBY FORMING A LAYER OF SULPHUR-CONTAINING LIME ON THE SURFACE OF THE BATH, AND THEREAFTER, WITHOUT REMOVING THE LAYER OF SULPHUR-CONTAINING LIME, BLOWING THE BATH BY MEANS OF SIDE BLOWING OR THROUGH THE BOTTOM OF THE APPARATUS CONTAINING THE PIG IRON WITH A GAS WHICH IS OXIDIZING WITH RESPECT TO SILICON AT THE TEMPERATURE OF THE BATH, THEREBY FORMING GLOBULES OF MANGANESE AND IRON SILICATES WHICH RISE IN THE BATH AND FORM A LAYER OF SLAG BELOW THE LAYER OF LIME, THE OXIDIZING GAS EMPLOYED BEING LIMITED TO SUCH AN AMOUNT AND BEING FED AT SUCH A RATE THAT THERE IS NO VIOLENT STIRRING OF THE BATH AND THE GAS IS SUBSTANTIALLY ENTIRELY ABSORBED BY THE BATH SO THAT SUBSTANTIALLY NO GAS BUBBLES REACH THE SURFACE OF THE BATH.
References Cited (Backward Citations)
US239621A
Cited
US2693411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |