US3778250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating metallic melts
Assignee: Jones and Laughlin Steel Inc
•
Filing: 1970-12-11
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Granted: 1973-12-11
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Expires: 1990-12-11
Abstract
Abstract Method and apparatus for treating a metallic melt, such as molten steel in a ladle, are disclosed. The apparatus includes an inner tubular member, through which an additive is delivered to within the melt, and a coaxially disposed outer tubular member, the annulus between the two tubular members serving as a passageway for gas delivered to the melt. The gas is introduced into the melt through a porous refractory element positioned about the ends of the tubular members.
Inventors
- 👤 G Bernsmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:42
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0037; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C7/04; C21C7/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
The method of claim 1 wherein the metallic melt is molten steel, the additive is a deoxidant and the gas is a gas inert to the steel.
Claim 2
Dependent Claim
16 words
The method of claim 2 wherein the deoxidant is aluminum, and the inert gas is argon.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the additive is delivered to the melt in the form of a rod.
Claim 4
Dependent Claim
19 words
The method of claim 4 wherein the metallic melt is molten steel, and the additive is an alloying material.
Claim 5
Dependent Claim
40 words
The method of claim 4 including delivering the additive to the melt through a tubular member open at the bottom thereof to the melt and establishing a second gas stream independent of the first gas stream within said tubular member.
Claim 6
Dependent Claim
32 words
The method of claim 6 including maintaining the pressure of the second gas stream at a value high enough to prevent the melt from entering the tubular member at its open bottom.
References Cited (Backward Citations)
US1562655A
Cited
US2085802A
Cited
US2871008A
Cited
US2698749A
Cited
US2776206A
Cited
US2781260A
Cited
GB972708A
Cited
US3251680A
Cited
US3598575A
Cited
US3642466A
Cited
US3666449A
Cited
US3634075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |