Patent US3942775A successfully refreshed from Google Patents.
US3942775A
Expired / Lapsed
US
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Submerged desulphurization device and method
Assignee: Individual
•
Filing: 1974-07-29
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Granted: 1976-03-09
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Expires: 1994-07-29
Abstract
Abstract A ladle for receiving molten metal is equipped with an apparatus for introducing addition agents into molten steel in the ladle and takes the form of a hollow plunger partially formed of consumable material and serving to introduce the addition agents into the molten metal at a constant predetermined rate.
Inventors
- 👤 Micheal Donald LaBate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:14
CPC Classifications
C; C21; C21C; C21C7/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
In combination: a refractory lined, apertured ladle for containing a molten metal; means to open and close the aperture of the ladle; a refractory lined rod extending within the ladle and terminating in an enlarged end section at a lower end portion of the ladle; consumable container means carried by the rod at said enlarged end section, said container means comprising a material consisting essentially of about 125 to 135 lbs. of a material selected from the group comprising dolomite and limestone, from 8 lbs. to 16 lbs. of a material selected from the group comprising wood chips, wood flour, and rice hulls, and from 4 lbs. to 12 lbs. of an oil class hydrocarbon resin binder and catalyst for the binder; and an addition agent in said container means for known, predetermined rate of release into molten metal in the ladle to treat the molten metal as the container means is consumed at a known, predetermined rate in the molten metal.
Claim 2
Dependent Claim
162 words
In combination: a refractory lined, apertured ladle for containing a molten metal; means to open and close the aperture of the ladle; a refractory lined rod extending within the ladle and terminating in an enlarged end section at a lower end portion of the ladle; consumable container means carried by the rod at said enlarged end section, said container means comprising a material consisting essentially of about 125 to 135 lbs. of a material selected from the group comprising dolomite and limestone, from 8 lbs. to 16 lbs. of a material selected from the group comprising wood chips, wood flour, and rice hulls, and from 4 lbs. to 12 lbs. of an oil class hydrocarbon resin binder and catalyst for the binder; and an addition agent in said container means for known, predetermined rate of release into molten metal in the ladle to treat the molten metal as the container means is consumed at a known, predetermined rate in the molten metal.
Claim 3
Dependent Claim
27 words
The combination as in claim 1, wherein said container means is hollow and has an opening in a lower end thereof and a closure in the opening.
Claim 4
Dependent Claim
24 words
The combination as in claim 1, wherein said rod is hollow and has an open upper end and a cover closing the open end.
Claim 5
Dependent Claim
25 words
The combination as in claim 1, wherein the rod comprises a section of steel pipe and a jacket of said consumable material on the pipe.
Claim 6
Dependent Claim
18 words
The combination as in claim 4, wherein said jacket comprises a plurality of superimposed rings of insulating material.
Claim 7
Dependent Claim
29 words
The combination as in claim 1, wherein the container comprises about 132 lbs. of dolomite, 16 lbs. of wood chips and 10 lbs. of a binder and catalyst therefor.
References Cited (Backward Citations)
US40472A
Cited
US1876732A
Cited
US2005540A
Cited
US2776206A
Cited
GB765254A
Cited
US2809886A
Cited
US3322530A
Cited
GB997566A
Cited
US3212749A
Cited
US3585025A
Cited
US3784177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |