Appeal No. 96-2194
Application 08/042,292
See 37 CFR § 1.192(c)(7) (1995) (The Board shall select a single
claim for consideration from a group of claims that an appellant
treats as standing or falling together).
Hüschelrath discloses a method and apparatus for non-
destructively examining ferromagnetic bodies for structural
faults. The disclosed embodiment shows apparatus for inspecting
a sleeve portion 2 at the end of a tubular body 1. Referring to
Figures 1-3, an electromagnet 10 and a pair of magnetic shoes 6
and 7 extending along either side of sleeve 2 produce a magnetic
field in the sleeve. The strength of this field is measured at a
plurality of points by Hall generators 12, which are supported on
holders 8 and 9. Two layers of Hall generators may be arranged
one above the other with any two Hall generators that lie one
above the other being electrically connected by a differential
connection (col. 4, lines 18-22). A differential connection of
this type is shown in Figure 4, wherein the outputs of two Hall
detectors 12 are connected via a differential amplifier to an
input of multiplexer 20 (col. 4, lines 59-61). As all of the
inputs to multiplexer 20 are provided by detectors 12, the
examiner is incorrect to state that "[p]oles 6, 7 and sensors 12
are connected as pairwise probes to the multiplexer" (Answer at
6). The electromagnet 10, magnetic pole shoes 6 and 7 and
-4-
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