Appeal No. 96-3374
Application No. 08/115,974
10. Thereafter, the assembly is sintered at a predetermined
temperature in which a liquid phase yields to form a cam piece
20 sintered on the shaft. Hiraoka further discloses that in5
general, the material B is more fluidal and easily compacted
to a high density than the material A. When both materials A
and B are filled to the same height in molding, there is a
tendency that the material B has a higher density than the
material A. Therefore, when the material B is filled to half
the axial height of the material A, the material B is much
more dense than the material A. The higher the density, the
lower the shrinkage. Hiraoka states that this means that the
materials A and B are easily prepared to have the respectively
desired shrinkages which differ by a preselected value from
each other.6
After the scope and content of the prior art are
determined, the differences between the prior art and the
5See column 3, lines 46-59, of Hiraoka.
6See column 4, lines 17-28, of Hiraoka.
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