US4049442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for desulfurizing iron melts
Assignee: Evonik Operations GmbH
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Filing: 1976-01-06
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Granted: 1977-09-20
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Expires: 1996-01-06
Abstract
Abstract Iron melts, particularly iron melts made by the torpedo ladle method, can be efficiently desulfurized by adding thereto a mixture of calcium carbide and diamide lime wherein the content of diamide lime is from 40 to 70% by weight of the desulfurizing composition.
Inventors
- 👤 Alfred Freissmuth
- 👤 Walter Heinl
- 👤 Herbert Knahl
- 👤 Erich Pfluger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02; C21C1/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
Composition for desulfurizing iron melts in torpedo ladles, comprising a mixture of calcium carbide and diamide line in which the content of diamide lime is from more than 40% by weight up to 70% by weight of the mixture.
Claim 2
Dependent Claim
39 words
Composition for desulfurizing iron melts in torpedo ladles, comprising a mixture of calcium carbide and diamide line in which the content of diamide lime is from more than 40% by weight up to 70% by weight of the mixture.
Claim 3
Dependent Claim
23 words
Desulfurizing composition as claimed in claim 1 comprising about 50% by weight of diamide lime and about 50% by weight of calcium carbide.
Claim 4
Dependent Claim
25 words
Process for the desulfurization of iron melts in torpedo ladles which process comprises adding to the iron melt a composition as claimed in claim 1.
Claim 5
Dependent Claim
16 words
Process as claimed in claim 3 wherein said composition is introduced into said iron melt intermittently.
Claim 6
Dependent Claim
14 words
Process as claimed in claim 4 wherein said composition is employed in equal doses.
Claim 7
Dependent Claim
23 words
Process as claimed in claim 4 wherein said composition is employed in varying doses per unit period of time between said intermittent introduction.
Claim 8
Dependent Claim
25 words
Process as claimed in claim 3 wherein said composition is introduced into the iron melt by blowing it in in a current of carrier gas.
Claim 9
Dependent Claim
17 words
Process as claimed in claim 7 wherein the carrier gas stream flow rate is varied over time.
References Cited (Backward Citations)
US3551139A
Cited
US3929464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |