Appeal No. 96-2194
Application 08/042,292
Hüschelrath's electromagnet 10 and poles shoes 6 and 7 produce a
single magnetic field which, as distorted by the presence of
ferromagnetic end portion 2 of body 1, is detected by detectors
12. In Houskamp's buried-wire electric field guidance system,
the buried wire produces a single electric field whose strength
is detected at two different locations by a pair of probes.
The examiner has not explained, and it is not apparent to us, why
the artisan would have been motivated to replace Hüschelrath's
single magnetic field with two or more electric fields. For this
reason, we are reversing the rejection of claim 1 under 35 U.S.C.
§ 103 as unpatentable over Hüschelrath in view of Houskamp is
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Last modified: November 3, 2007