Appeal No. 98-2457
Application No. 08/851,312
subjecting the filled metal pipe to "hot-plastic deformation"
to reduce the cross section of the metal pipe to such extent
that the cross section is "reduced at a dimensional reduction
ratio ranging from 16% to 92% under a heated condition, so
that the material powder filled in the metal pipe is sintered"
(emphasis added), and then cooling the resulting metal pipe
containing sintered ceramic material powder therein "slowly at
a rate of less than 50ºC/min."
We find nothing in Jin which would have been suggestive
to one of ordinary skill in the art at the time of appellants’
invention of subjecting the filled metal pipe therein to "hot-
plastic deformation" to reduce the cross section of the metal
pipe to such extent that the cross section is "reduced at a
dimensional reduction ratio ranging from 16% to 92% under a
heated condition, so that the material powder filled in the
metal pipe is sintered" (emphasis added), and then cooling the
resulting metal pipe containing sintered ceramic material
powder therein "slowly at a rate of less than 50ºC/min." Even
if we might agree with the examiner that Jin (col. 5, lines
62-65) is suggestive of hot-plastic deformation of the filled
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