Appeal 2007-2869
Application 10/286,535
resulting from current induced by the first and second magnetic fields,’” as recited
in independent claim 1 (Reply Br. 2), because “adding the coils of Mcgaffigan [sic]
onto the system of Sakayangi would effectively result in magnetic fields produced
from each of the coils of Sakayangi and McGaffigan constructively and
destructively interfering throughout the induction heating device resulting from the
proposed combination,” resulting in a “core that would be underheated in some
portions, while overheated in others” Id. We disagree.
First, although the use of a multiple coil structure results in magnetic fields
which constructively and destructively interfere with one anther, we disagree with
Appellants’ contention that the disclosure of such a coil structure necessarily
results in the inability to cure coatings disposed on windings of a wound core as
claimed. McGaffigan discloses that the hollow cylindrical coil structure
concentrates the magnetic field induced by an alternating electric current applied
thereto interiorly of the coil and produces relatively little external magnetic
radiation (Findings of Fact 4, 5, and 7). In other words, it is precisely the
constructive and destructive nature of the adjacent fields which provides the
advantage of low external emissions in the coil structure of McGaffigan.
Furthermore, McGaffigan discloses that the induction device is capable of causing
a ferromagnetic material to be heated to approximately its effective Curie
temperature (i.e., the temperature above which the material becomes purely
paramagnetic), if desired (Finding of Fact 8). The Examiner found the
temperatures needed to cure the coatings of Sakayanagi to be less than 500 degrees
C, while the Curie temperature of a ferromagnetic material is approximately 760
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