Appeal No. 1998-2422
Application 08/488,380
'687 patent in an obviousness-type double patenting rejection.
Accordingly, the rejection of claims 77-80 and 83-88 is
reversed.
Obviousness
Keogh discloses a system for determining the relative
position of a first object with respect to a second object
using electrical detection of registration (abstract). The
registration can be used during the manufacture of multi-layer
printed circuit boards (PCBs), but is not limited to that
particular application (col. 6, lines 6-11). A first
conductive pattern (called a "driver coil," col. 6, line 21)
on one layer is driven with an alternating current at a
suitable frequency and is moved relative to a second
conductive pattern on a second layer (abstract). Voltage
induced in the second pattern by the electromagnetic field of
the first pattern is detected and indicates the positional
relationship between the first and second conductive patterns
(abstract). Thus, the claimed method and apparatus for
detecting the positional relationship between two layers using
conductive coils is expressly taught in Keogh.
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