Appeal No. 98-0599
Application 08/434,029
cartridge rib is engageable with the annular rib projecting
from the second surface of the substrate.
Kato’s disk cartridge evidently does not include any
cartridge rib on the second surface. However, it does show
annular ribs extending from the second surface of the
substrate. The examiner identifies in Sakaguchi a cartridge
rib extending from the second surface of the disk cartridge
towards the second surface of the disk substrate, but can
point to no annular rib extending from the second surface of
Sakaguchi’s disk substrate.
The examiner concludes, however, that it would have been
obvious to add a cartridge rib to Kato just as it is disclosed
in Sakaguchi, to prevent the entry of dust and other
contaminants at the opening. According to the examiner, “such
protective walls, dams and other structures are widely used to
inhibit the ingress of dust in order to make the cartridge as
airtight as possible without compromising functionality”
(answer at 7). The appellant has not disputed the examiner’s
finding that protective walls, dams, and other structures as
such are widely used to inhibit the ingress of dust. Thus,
the examiner has not been shown to have erred in making that
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