Patent US3778250A successfully refreshed from Google Patents.
US3778250A
Expired / Lapsed
US
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Method for treating metallic melts
Assignee: Jones and Laughlin Steel Inc
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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 22:13
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.
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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 |