Appeal 2007-0881
Application 10/250,972
coils serves to accelerate the molten material . . . by ‘a U turn agitation similar
to a rotating magnetic field,’” wherein the “‘coils are placed so as to surround
the short side’” of the mold causing the molten metal to make a U turn (id.).
Appellant contends the electromagnetic coils 2c,2e and 2f,2h are “generating
a traveling magnetic field for rotation of the melt, . . . not a braking force” (id.
7-8).
We find Narita would have disclosed to one of ordinary skill in this
art in Fig. 4 an arrangement of two sets of “electromagnetic agitating coils”
2c,2d,2e and 2f,2g,2h wherein 2d and 2g are set on the rear edge of the
respective opposite short sides and each set forms a “]-shape” on each side
of the mold. In this respect, Narita discloses
[a]s a result, especially the un-solidified melt . . . in the . . .
[short side] portions is acted on by a high propulsion force so
that the agitating flow is accelerated. . . . [The] flow of the un-
solidified metal starts in the portion of coil (2c) . . . [and] as the
melt flows and enters the magnetic field of coil (2d) . . . the
flow direction is changed, while it is accelerated. Then, in the
portion of coil (2e) while the direction is changed to the
direction nearly parallel to the major edge of slab (1), at the
same flow velocity or at the velocity after acceleration, it flows
and is pressed to the central side of the major side of slab (1)
again. [A]s the flow enters the magnetic field of coil (2f), it
receives a propulsion force in the direction indicated by the
arrow . . . [and] by means of coils (2g) and (2h), the flow makes
a U-turn on the left [short side] edge portion, while the flow is
accelerated and it is sent towards the rear-right minor edge
portion. In this way, agitation of the un-solidified melt . . . is
performed with a U-turn at the two minor edge portions
simultaneously . . . .
McElroy translation 3-4 and Fig. 4; see also Aho translation 1-2 and Fig. 4.
Narita discloses that “in the minor edge portions, U-turn agitation is
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