US4143866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deoxidizing and/or desulfurizing of steel
Assignee: Vodafone GmbH
•
Filing: 1977-01-28
•
Granted: 1979-03-13
•
Expires: 1997-01-28
Abstract
Abstract The solid treatment material is contained in rotationally symmetrical, flotation body having a ballast weight and openings for discharging jets of vaporized treatment material into the steel while the body floats, and the jets have a tangential component so that the body rotates and wobbles and the jets vary their direction to distribute the treatment material.
Inventors
- 👤 Hans Schrewe
- 👤 Fritz-Peter Pleschiutschnigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/06; C21C7/064
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A device for treating molten steel comprising: a hollow, floatation body for free floating without external attachment and made of refractory material and containing ballast weight means in the lower portion of the hollow body sufficient to maintain the body submerged in molten steel and sufficiently low to maintain the body in an upright disposition, said hollow body further containing solid treatment material for treating the steel, the treatment material being disposed above the ballast weight means, the body as filled with said materials will initially be at least almost completely submerged, the body being constructed to have openings disposed near a boundary between the material and the ballast weight means, there being no openings near a top portion of the hollow interior, the openings being oriented to an axis of the body with a tangential component so that the openings will undergo rotation when the body is submerged in steel and pursuant to evaporation of said treatment material as the evaporated treatment material is injected by the openings into the molten steel, the ballast material does discharge.
Claim 2
Independent Claim
178 words
A device for treating molten steel comprising: a hollow, floatation body for free floating without external attachment and made of refractory material and containing ballast weight means in the lower portion of the hollow body sufficient to maintain the body submerged in molten steel and sufficiently low to maintain the body in an upright disposition, said hollow body further containing solid treatment material for treating the steel, the treatment material being disposed above the ballast weight means, the body as filled with said materials will initially be at least almost completely submerged, the body being constructed to have openings disposed near a boundary between the material and the ballast weight means, there being no openings near a top portion of the hollow interior, the openings being oriented to an axis of the body with a tangential component so that the openings will undergo rotation when the body is submerged in steel and pursuant to evaporation of said treatment material as the evaporated treatment material is injected by the openings into the molten steel, the ballast material does discharge.
Claim 3
Dependent Claim
16 words
A device as in claim 1, said treatment material being a material for deoxidizing the steel.
Claim 4
Dependent Claim
15 words
A device as in claim 1, said treatment material being a material for desulfurizing steel.
Claim 5
Dependent Claim
18 words
A device as in claim 1, said treatment material being a material for desulfurizing and deoxidizing the steel.
Claim 6
Dependent Claim
28 words
A device as in claim 1, said body having rotationanlly symmetric contour in relation to said axis, said openings being effective in a plane transversely to said axis.
Claim 7
Dependent Claim
21 words
A device as in claim 1, said openings having curved contour veering more towards a tangential direction in radial outward direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |