Patent US4751047A successfully refreshed from Google Patents.
US4751047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of adding low-melting-point metal to molten steel
Assignee: ISG TECHNOLOGIES Inc
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Filing: 1987-05-26
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Granted: 1988-06-14
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Expires: 2007-05-26
Abstract
Abstract A method of adding low-melting-point metal to molten steel by injecting molten low-melting-point metal into the vessel containing the molten steel through a portion of the side wall of the vessel that is located below the surface level of the molten steel.
Inventors
- 👤 Masashi Yoshida
- 👤 Noboru Okuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:43
CPC Classifications
B; B22; B22D; B22D1/00; C; C21; C21C; C21C7/00; C21C7/0006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A method of adding low-melting-point metal to molten steel comprising the step of injecting molten Pb or Bi into a vessel containing the molten steel through a portion of a side wall of the vessel at a point above the bottom of the vessel of about between 1/3 and 2/3 the depth of the molten steel.
Claim 2
Independent Claim
56 words
A method of adding low-melting-point metal to molten steel comprising the step of injecting molten Pb or Bi into a vessel containing the molten steel through a portion of a side wall of the vessel at a point above the bottom of the vessel of about between 1/3 and 2/3 the depth of the molten steel.
Claim 3
Dependent Claim
11 words
A method as in claim 1, wherein said vessel is open.
Claim 4
Independent Claim
101 words
A method of adding low-melting-point metal to molten steel comprising the steps of injecting molten Pb or Bi into a vessel containing molten steel through a portion of a side wall at a point above the bottom of the vessel of about between 1/3 and 2/3 the depth of the molten steel, supplying a gas for stirring the molten steel from a bottom wall of the vessel near the said side wall under the point at which the low-melting-point metal is injected, and forming an up-current in the vicinity of the region at which the low-melting-point metal is to be injected.
Claim 5
Independent Claim
101 words
A method of adding low-melting-point metal to molten steel comprising the steps of injecting molten Pb or Bi into a vessel containing molten steel through a portion of a side wall at a point above the bottom of the vessel of about between 1/3 and 2/3 the depth of the molten steel, supplying a gas for stirring the molten steel from a bottom wall of the vessel near the said side wall under the point at which the low-melting-point metal is injected, and forming an up-current in the vicinity of the region at which the low-melting-point metal is to be injected.
Claim 6
Dependent Claim
121 words
A vessel for containing molten steel and for dissolving Pb or Bi into the molten steel, said vessel including a feeding inlet for injecting Pb or Bi under pressure, a supplying inlet for injecting a stirring gas, and an outlet for ejecting molten steel, with Pb or Bi dissolved therein, said feeding inlet being positioned in a side wall of said vessel at a point above the bottom of said vessel of about between 1/3 and 2/3 the depth of the molten steel, said feeding inlet having a brick permeable to Pb or Bi and impermeable to molten steel, and said supplying inlet being located in a bottom wall of the vessel near the side wall under the said feeding inlet.
Claim 7
Dependent Claim
121 words
A vessel for containing molten steel and for dissolving Pb or Bi into the molten steel, said vessel including a feeding inlet for injecting Pb or Bi under pressure, a supplying inlet for injecting a stirring gas, and an outlet for ejecting molten steel, with Pb or Bi dissolved therein, said feeding inlet being positioned in a side wall of said vessel at a point above the bottom of said vessel of about between 1/3 and 2/3 the depth of the molten steel, said feeding inlet having a brick permeable to Pb or Bi and impermeable to molten steel, and said supplying inlet being located in a bottom wall of the vessel near the side wall under the said feeding inlet.
Claim 8
Dependent Claim
11 words
A vessel as in claim 4, wherein said vessel is open.
References Cited (Backward Citations)
US3756805A
Cited
US4147533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |