US3663205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining ferrous metals
Assignee: British Iron and Steel Research Association BISRA
•
Filing: 1970-09-08
•
Granted: 1972-05-16
•
Expires: 1990-09-08
Abstract
Abstract Method for refining molten metal includes the steps of adjusting the distance between a stream of molten metal and the nozzles which direct a stream of oxidizing gas against said stream to shatter it.
Inventors
- 👤 David Arthur Whetton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:22
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
The method claimed in claim 1 in which said molten metal falls vertically and in which said distance is adjusted by angularly adjusting said gas discharge means in a vertical plane.
Claim 2
Dependent Claim
25 words
The method claimed in claim 2 in which said distance is adjusted by moving said gas discharge means toward and away from said metal stream.
Claim 3
Independent Claim
119 words
The method of maintaining substantially constant a predetermined degree of shatter of a stream of molten metal produced in spray treatment apparatus having gas discharge means for projecting against a freely falling stream of said metal at least one jet of gas capable of reacting with said molten metal, which method comprises the steps of adjusting the velocity of flow of said gas from said gas discharge means to the velocity required to supply the volume needed to treat the metal, and adjusting the distance between said gas discharge means and the zone at which said at least one jet impinges on said stream to produce a gas velocity at impingement which will provide said predetermined degree of shatter.
Claim 4
Dependent Claim
31 words
The method claimed in claim 4 in which said molten metal falls vertically and in which said distance is adjusted by angularly adjusting said gas discharge means in a vertical plane.
Claim 5
Dependent Claim
25 words
The method claimed in claim 4 in which said distance is adjusted by moving said gas discharge means toward and away from said metal stream.
Claim 6
Dependent Claim
25 words
The method claimed in claim 4 in which said molten metal is an impurity-containing iron, and said gas has a refining effect on said iron.
References Cited (Backward Citations)
SU159552A1
Cited
US2915380A
Cited
US2967351A
Cited
US2969282A
Cited
GB1014773A
Cited
US3201105A
Cited
US3340334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |