Patent US4471950A successfully refreshed from Google Patents.
US4471950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable, consumable stopper plug for steel making and handling vessels
Assignee: Individual
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Filing: 1982-10-22
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Granted: 1984-09-18
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Expires: 2002-10-22
Abstract
Abstract A stopper plug for sealing the tap hole of a molten metal receptacle is formed of refractory materials, fibrous substances, and consumable-disintegrable materials in a hollow conical plug that is expandable in a tap hole by movement of a wedge-shaped member therein, the expanded stopper plug being capable of effectively sealing the tap hole for a predetermined time.
Inventors
- 👤 Micheal D. LaBate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:27
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4653; B; B22; B22D; B22D41/00; B22D41/14; B22D41/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
An improvement in a stopper plug for sealing a tap hole in a molten metal receptacle for a predetermined time, the improvement comprising forming said plug in a hollow elongated blunt-nosed conical shape and means for expanding said conical shape within said tap hole, said hollow conical shape formed of a refractory material, a fibrous substance and a binder, said means for expanding said conical shape comprising a cross sectionally circular disc member positioned in said hollow conical shape, an opening in the center of said circular member, a rod having a disc thereon, said disc arranged to engage said cross sectionally circular disc member whereby movement of said rod in one direction moves said cross sectionally circular disc member toward said blunt nose and the disc on said rod holds said cross sectionally circular member in transverse relation to said conical shape so as to expand said conical shape into sealing engagement with said tap hole.
Claim 2
Dependent Claim
157 words
An improvement in a stopper plug for sealing a tap hole in a molten metal receptacle for a predetermined time, the improvement comprising forming said plug in a hollow elongated blunt-nosed conical shape and means for expanding said conical shape within said tap hole, said hollow conical shape formed of a refractory material, a fibrous substance and a binder, said means for expanding said conical shape comprising a cross sectionally circular disc member positioned in said hollow conical shape, an opening in the center of said circular member, a rod having a disc thereon, said disc arranged to engage said cross sectionally circular disc member whereby movement of said rod in one direction moves said cross sectionally circular disc member toward said blunt nose and the disc on said rod holds said cross sectionally circular member in transverse relation to said conical shape so as to expand said conical shape into sealing engagement with said tap hole.
Claim 3
Dependent Claim
30 words
The stopper plug set forth in claim 1 and wherein the refractory material is at least one of silica, quartz, magnesia, olivine, mullite, aluminum oixde, chamotte, dolomite, magnesite or perlite.
Claim 4
Dependent Claim
34 words
The stopper plug set forth in claim 1 and wherein the fibrous substance is at least one of inorganic fibrous substance selected from the group consisting of aluminum silicate, rock wool and slag wool.
Claim 5
Dependent Claim
29 words
The stopper plug set forth in claim 1 and wherein the consumable and/or disintegrable material is at least one of a group consisting of paper, sawdust and wood flour.
Claim 6
Dependent Claim
29 words
The stopper plug set forth in claim 1 and wherein the binder is at least one of a phenol-formaldehide resin, a urea-formaldehyde resin, a furan resin or sodium silicate.
Claim 7
Dependent Claim
66 words
The improvement in a stopper plug for sealing a tap hole in a molten metal receptacle set forth in claim 1 and wherein a metal member is positioned in said hollow, conical shape adjacent said blunt nose so as to limit movement of said rod and disc thereon and said cross sectionally circular body member with respect to said blunt nose of said hollow conical shape.
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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |