Appeal No. 2000-1333
Application No. 08/691,988
corrugated strip is substantially unyielding. Thus, when the
interior of the matrix becomes hotter than the outer zone,
high hoop stresses are set up in the flat strips of the outer
part of the matrix” (column 1, lines 41 through 45). These
hoop stresses produce yielding, cracking, and ultimately
failure of the disk. Hubble’s solution is to eliminate or
minimize the hoop stresses and their attendant failures by
replacing the circumferentially unyielding flat strip with a
strip capable of yielding or stretching to prevent the high
hoop stresses from developing (see column 1, lines 46 through
51). In the embodiment of Hubble’s disk shown in Figures 3
and 4, the flat strip is replaced by a corrugated strip. The
resulting disk consists of a first strip 37 having relatively
large corrugations and a second strip 38 having relatively
small corrugations. The corrugations of the first strip are
three times as wide and about six times as deep as the
corrugations of the second strip (see column 3, lines 17
through 39).
In proposing to combine Adrian and Hubble to reject claim
1, the examiner concludes that it would have been obvious at
the time the invention was made to a person having ordinary
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