Appeal No. 95-2880
Application 08/091,294
else the material being dispensed would leak therethrough when
pressure is applied to extrude it from the caulking gun during
use, which would render the gun inoperable.
Yoshioka discloses a pouring spout mounted upon a container.
It is attached by a bead (31) and groove (32) connection "in a
snap-together, snap-apart and swiveling manner" (column 3, lines
12 and 13). This reference provides confirmation that it was
known at the time of the appellant's invention to utilize a bead
and groove connection in order to rotatably attach a device to
the dispensing end of a container. We agree with the examiner
that Yu would have taught one of ordinary skill in the art that
screw threads and bead-and-groove arrangements are alternative
means for attaching nozzles and like attachments to the discharge
ends of dispensing devices. We further agree that it would have
been obvious to one of ordinary skill in the art to modify the
Colin dispenser by replacing the threaded attachment of the
nozzle with a bead and groove system in view of the teachings of
Yu and Yoshioka, suggestion being found in the self evident
advantages thereof, such as ease of installation and removal,
which is alluded to in the second full paragraph on page 9 of Yu
and in column 3 of Yoshioka. It is our further view that one of
ordinary skill in the art would have possessed sufficient
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