Appeal No. 1996-2991
Application 08/302,931
What is significant, however, is what is noted by the
examiner in terms of the teachings of Farries, which utilizes
a boron and/or boron germanium-doped silica or glass material
as a substrate material for the core of the fiber-optic cable
therein. Although it may be subject to dispute between the
appellants and the examiner as to the nature of the actual
gratings formed in Farries, Farries does explicitly teach of
the formation of gratings within this boron-doped core region,
thus making it analogous to the core region of the admitted
prior art of appellants and that of Legoubin.
In contrast to the arguments presented by appellants in
the brief and reply brief as to this rejection, it may be true
that
the art recognizes, generally speaking, that boron-doped glass
is normally used for cladding and that germanium-doped glass
is normally used for the core of an optical fiber, it is
explicitly taught in Farries that such a boron-doped glass is
used as the core material as a modifying agent alone or in
addition to germanium-doped glass material to form the core
portion of an optical fiber. Based on this teaching alone, as
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