Appeal No. 1996-1456
Application No. 08/059,840
DISCUSSION
I. Independent claims 1, 21 and 26
Hitachi Maxell, the examiner’s primary reference, discloses
a magnetic tape cartridge case designed to attenuate modulation
noise generated by remote oscillation sources. As described in
the reference,
a cartridge case is made of a material of a complex
plastic material mixed with a filler. In order to
reduce an outside oscillation of the magnetic tape
cartridge occurred by transferring from a motor etc.
arranged in a tape recorder to a magnetic tape
cartridge, the complex plastic material is made of a
mixture of a plastic base made of polyolefine, such as
polyethylene, and polypropylene etc., and a filler of
45 percent to 65 percent by weight of the plastic base
in the shape of a particle, being made of calcium
carbonate or barium sulfate. . . .
The reason why the mixture rate of the filler is
in the range of 45 percent to 65 percent by weight of
the plastic base is as follows. That is, in case the
mixture rate is less than 45 percent, the cartridge
case may be often broken, on the other hand, in case
the mixture rate is more than 65 percent, the plastic
material may not be filled in a mold satisfactorily
when the plastic material is formed in a shape because
of the less fluidity of the plastic material, resulting
in that the problems occur in the manufacturing process
and the manufacturing technique [pages 4 and 5].
The examiner concedes (see page 4 in the main answer) that
Hitachi Maxell is not responsive to the limitations in
independent claim 1 requiring the first and second casing members
to be made of crystalline resin having a filler constituting “10
percent to 30 percent by weight of the crystalline resin
4
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