Appeal No. 96-0949
Application 08/236,091
sense the various magnitudes of magnetic fields associated
with secondary pickup coils 20 best depicted in Figure 2.
However,
it appears to us that the peak detectors and sample and hold
circuits elements in Figure 7 are utilized for the purpose of
excluding extraneous magnetic fields since there are multiple
magnetic fields taught and involved in the guidance system of
Swenson.
Even though we recognize that Swenson appears to contain
analogous teachings to those in Laib, we are not convinced the
artisan would have found it obvious to have combined the
Swenson teachings of the noted figures with those in Laib at
least because it appears to us that the accuracy that may have
been derived from the system of Swenson and would not
necessarily have enhanced the given accuracy for the Laib
system as a whole. We are unconvinced by the examiner's
rationale of combinability and can surmise none of our own
from our understanding and study of the collective teachings
of both references. The teachings of Laib and Swenson may or
could have been combinable, but from an artisan's perspective,
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