Appeal No. 1998-2756
Application No. 08/448,137
having a round cross section, cold rolling the rod wire into a
flat wire such that the reduction in thickness is equal to or
more than about 90%, and heat treating the wire to sinter the
superconducting oxide (Brief, pages 3-4). Claim 8 is
illustrative of the subject matter on appeal and is reproduced
below:
Claim 8. A method of producing an oxide-type super-conducting
flat wire having a critical current density of at least 1,000
A/cm , comprising an oxide layer having a superconducting2
property and a metal layer surrounding the oxide layer and has
so flat a cross section vertical to the longitudinal direction
of the wire that the upper and lower lines between the oxide
layer and the metal layers appearing on the cross section
having a zone over which they are parallel to each other, the
thickness of the oxide layer being cold rolled in the range of
about 0.40 to 0.75 based on the whole thickness of the wire,
said whole thickness being about 0.2 mm or less, and said
metal layer being deformable to follow the shrink deformation
of the oxide layer when heat treated to be sintered, but rigid
when used, which comprises filling a metal tube with an oxide
powder having a superconducting property, drawing the tube
into a rod wire having a round cross section, then cold
rolling the rod wire into the flat wire so that (t - t)/t Xi i
100 is equal to or more than about 90%, wherein t is the
i
whole thickness of the cross section of the rod wire before
the cold rolling and t is the whole thickness of the cold-
rolled flat wire, and then heat treating the flat wire to
sinter the superconducting oxide.
The examiner has relied upon the following references as
evidence of obviousness:
Saur 3,243,871 Apr. 5, 1966
2
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