Appeal No. 95-2647
Application 08/068,105
The claims on appeal are directed to a refractory slide-gate to control the flow of molten metal from
the bottom of a ladle or tundish. Claim 1, 5 and 6 are representative of the claimed subject matter and read
as follows:
1. A refractory slide-gate plate having a nozzle hole through which molten metal
flows in and out and an inert gas supply groove for supplying inert gas into the nozzle hole,
comprising:
a refractory base plate which is designed in a ring shape;
a refractory plate member which is fixedly engaged with the inside of said ring-
shaped refractory base plate to be integrated with said refractory base plate, the inert gas
supply groove being formed on an inner peripheral portion of said ring-shaped refractory
base plate,
wherein said inert gas supply groove is formed on a slide surface of said refractory
slide-gate plate.
5. The refractory slide-gate plate as claimed in claim 1, wherein said inert gas
supply groove is designed in 2 to 20 mm width and in 2 to 20 mm depth.
6. The refractory slide-gate plate as claimed in claim 1, wherein said refractory
plate member is formed of Al O -ZrO -C-based refractory material or ZrO -based2 3 2 2
refractory material.
References of Record
The following references of record are relied upon by the examiner as evidence of obviousness:
Shapland et al. (Shapland) 2 4,545,512 Oct. 8, 1985
Arakawa et al. (Arakawa) 4,583,721 Apr. 22, 1986
Russo 5,004,131 Apr. 2, 1991
The copy of the Shapland patent of record in the present application at the time of the appeal was incomplete2
in that it does not include any of the drawing figures. We have obtained a complete copy of the patent and it is attached
to this decision. Any reference to the Shapland patent in this decision is directed to the complete copy of the patent.
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