Appeal No. 1999-0405
Application No. 08/651,571
grooves (4) oriented in the circumferential direction relative
to the shear force shown by the arrow seen in Figure 1 of the
drawings, with the gap between the members (1) and (2) and the
grooves (4) being filled with an epoxy-based resin adhesive
(5). Hattori notes, in the paragraph bridging pages 4 and 5,
that "[i]n this way, the surface area is increased to the
extent that grooves (4) are formed, not only increasing the
adhesive strength, but also, since the hardened adhesive (5)
is made to fill the grooves (4) of the fluororesin, the
adhesive (5) serves as a key, and the fluorocarbon polymer (1)
becomes extremely difficult to remove from the partner
material (2)."
In the examiner’s view, it would have been obvious to one
of ordinary skill in the art at the time appellants’ invention
was made to form the notched wall of the molten metal impeller
of either Thut or Cooper with a plurality of circumferentially
extending grooves in the form of a spiral as taught by Hattori
for the purpose of forming a strong joint.
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