Appeal No. 1999-0405
Application No. 08/651,571
Looking first at the examiner’s rejections relying on
Thut and Cooper, each of which is modified in view of Hattori,
we note that the primary references both disclose a molten
metal impeller including a circumferential notch and a bearing
ring cemented into said notch. As can be seen in Figure 1 of
Thut and Figure 10 of Cooper, the joint between the notch and
bearing ring in both of these references includes flat
surfaces of the notch cemented to flat surfaces on the bearing
ring. To account for the lack of grooves in the wall or walls
of the notch in Thut or Cooper as is required in the claims
before us on appeal, the examiner has turned to Hattori.
The Hattori reference is specifically directed to an
adhesion structure for fluorocarbon polymers. On page 2 of
the reference it is noted that the invention concerns the
adhesion of a fluorocarbon polymer to a partner material.
Difficulties in bonding fluorocarbon polymers to normal
partner materials with adhesive are also discussed on page 2.
In the example of the invention on page 4 of Hattori the
partner material is indicated to be a bondable metal member
(2) and the fluorocarbon polymer member (1) is provided with
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