Appeal No. 1999-2235
Application No. 08/577,493
any disclosure for the perpendicular component of the magnetic
signal being the maximum component.
Appellants (Brief, page 12) refer to Figure 3 and the
associated text in the specification. According to
appellants, as shown by the graph of Figure 3, the maximum
perpendicularly oriented field component of the magnetic
signal is greater than the maximum longitudinal field
component only when the perpendicular distance D from the head
is a fraction of the amagnetic gap G. Distance D includes any
airgap and the combined thicknesses of any overcoats and
lubricant on the media layer.
Chapman has a proposed gap dimension of 0.25 micron.
Chapman does not disclose the specifics of the media layer.
Although Hamilton may suggest contact between the head and the
media layer, thereby eliminating an airgap from the distance
D, Hamilton does not disclose whether the media layer includes
an overcoat layer and/or lubricant, and, if so, what the
thickness thereof would be. Therefore, it is unclear from the
evidence provided by the examiner whether the value of D would
be a fraction of the gap G, such that the perpendicular
magnetic field component would be maximum. Further the
5
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007