US3838798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous tundish nozzle
Assignee: Vesuvius Crucible Co
•
Filing: 1971-01-21
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Granted: 1974-10-01
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Expires: 1991-01-21
Abstract
Abstract A non-clogging tundish nozzle designed for the formation of a gas film in the bore thereof to keep the bore clean, and a preferred construction therefor.
Inventors
- 👤 W Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:44
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50; B22D41/58
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A ceramic article for pouring of molten metal therefrom comprising a homogeneous unitary ceramic body of uniform limited porosity having a bore therethrough defining the pouring passage for said metal, a porous ceramic annulus enclosed within said body to be concentric with and spaced from said bore, said annulus having insignificant resistance to the flow of a gas relative to the resistance of said body, and a passage between said annulus and the exterior surface of said body for delivering gas under pressure to said annulus for diffusion through said body to the surface forming said bore.
Claim 2
Dependent Claim
97 words
A ceramic article for pouring of molten metal therefrom comprising a homogeneous unitary ceramic body of uniform limited porosity having a bore therethrough defining the pouring passage for said metal, a porous ceramic annulus enclosed within said body to be concentric with and spaced from said bore, said annulus having insignificant resistance to the flow of a gas relative to the resistance of said body, and a passage between said annulus and the exterior surface of said body for delivering gas under pressure to said annulus for diffusion through said body to the surface forming said bore.
Claim 3
Dependent Claim
29 words
The combination as set forth in claim 1 wherein said annulus is close to and approximately equidistant from said bore and the top and bottom surfaces of said body.
Claim 4
Dependent Claim
21 words
The combination as set forth in claim 2 wherein said annulus is more remote from the outer periphery of said body.
Claim 5
Dependent Claim
23 words
The combination as set forth in claim 2 including an impermeable glaze on the exterior surface of said body other than said bore.
Claim 6
Dependent Claim
21 words
The combination as set forth in claim 1 wherein said body has a porosity on the order of 18 per cent.
Claim 7
Dependent Claim
26 words
The combination as set forth in claim 5 wherein said annulus is comprised of a material having a porosity on the order of 60 per cent.
Claim 8
Dependent Claim
16 words
The combination as set forth in claim 1 wherein said annulus is a porous fire brick.
Claim 9
Dependent Claim
26 words
The combination as set forth in claim 1 wherein said annulus is characterized by about the same coefficient of thermal expansion as that of said body.
Claim 10
Dependent Claim
19 words
The combination as set forth in claim 8 wherein said annulus is composed essentially of a crushed fused mullite.
Claim 11
Dependent Claim
15 words
The combination as set forth in claim 9 wherein said body is a zircon ceramic.
Claim 12
Dependent Claim
29 words
The combination as set forth in claims 1 wherein said annulus is spaced one-quarter to one-half inch from said bore and the top and bottom surfaces of said body.
Claim 13
Dependent Claim
96 words
A ceramic article providing a passage for the pouring of molten metal from a vessel comprising a homogeneous ceramic body of limited porosity having a bore therethrough, said bore defining the pouring passage for said metal, a porous ceramic annulus embedded in said body concentric with and radially spaced from said bore having insignificant resistance to the flow of a gas relative to the resistance of said body from whence gas under pressure will diffuse through said body to substantially the entire surface defining said bore, and means for delivering gas under pressure to said annulus.
Claim 14
Dependent Claim
96 words
A ceramic article providing a passage for the pouring of molten metal from a vessel comprising a homogeneous ceramic body of limited porosity having a bore therethrough, said bore defining the pouring passage for said metal, a porous ceramic annulus embedded in said body concentric with and radially spaced from said bore having insignificant resistance to the flow of a gas relative to the resistance of said body from whence gas under pressure will diffuse through said body to substantially the entire surface defining said bore, and means for delivering gas under pressure to said annulus.
Claim 15
Dependent Claim
32 words
The article as defined in claim 12 wherein said means for delivering gas under pressure to said annulus comprises a passage communicating between said annulus and the exterior surface of said body.
Claim 16
Dependent Claim
31 words
The article as defined in claim 13 and further including a second passage extending from said annulus to the exterior surface of said body on a side opposite said first passage.
Claim 17
Dependent Claim
33 words
The article as defined in claim 14 wherein said body is substantially cylindrical and the junction of the bottom and outer surfaces is beveled and said passages extend through the beveled surface thereformed.
References Cited (Backward Citations)
FR1146218A
Cited
US2866241A
Cited
US3330645A
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US3253307A
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US3373986A
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US3490755A
Cited
US3472432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |