Appeal 2007-2869
Application 10/286,535
3. Sakayanagi does not disclose that the magnetic fields produced by the
high-frequency coils 51 are oriented in opposite directions.
4. McGaffigan discloses a low emission induction heating coil
(McGaffigan, col. 1, ll. 15-19).
5. 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 (McGaffigan, col. 1, ll. 51-
54).
6. The coil structure 2 consists of a first series of conductive rings 4, 6,
8, and 10 and a second series of conductive rings, 4’, 6’, 8’, and 10’. The number
of conductive rings and width of the conductors employed in any specific
application is a function of the length of the device to be heated and the current to
be carried (McGaffigan, col. 3, ll. 25-32 and Fig. 1).
7. The magnetic fields produced by the two series of rings are out of
phase with one another interiorly of the rings. Thus, the fields interiorly of the
rings are intense, while the fields produced by the two sets of conductors
interconnecting the rings of the two series buck one another, materially reducing
radiation from these conductors (McGaffigan, col. 2, ll. 21-25).
8. In one embodiment of McGaffigan, the induction device is capable of
causing a ferromagnetic material to be heated to approximately its effective Curie
temperature, if Curie temperature regulation is desired (McGaffigan, col. 4, ll. 61-
66).
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