Appeal No. 2000-0210 Page 14
Application No. 08/893,906
Claim 6 on appeal reads as follows:
In a process for manufacturing a radial shaft-
sealing ring comprising a sealing ring made of a
polymeric material with sealing properties, whereby the
sealing ring has at least one lip that rests on the shaft
to be sealed and rests against a backing ring at the side
not subject to pressure, whereby the sealing ring is
permanently fastened to a reinforcing ring having an
angle-shaped profile with a radially inward extending leg
that at least partially overlaps and rests directly
against the backing ring, the process including the steps
of inserting both the reinforcing ring and the backing
ring in a tool cavity, filling the remaining space in the
tool cavity with a raw polymeric sealing material in the
form of a liquid or paste, allowing the polymeric sealing
material to solidify and bond to the reinforcing ring and
removing the radial shaft-sealing ring from the cavity;
the improvement comprising the step of applying a
coating of anti-adhesive material to the surface of the
backing ring prior to insertion in the tool cavity to
prevent it from attaching to the polymeric material that
the sealing ring is made of.
The test for obviousness is what the combined teachings
of the references would have suggested to one of ordinary
skill in the art. See In re Young, 927 F.2d 588, 591, 18
USPQ2d 1089, 1091 (Fed. Cir. 1991) and In re Keller, 642 F.2d
413, 425, 208 USPQ 871, 881 (CCPA 1981).
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