Appeal No. 1996-2991
Application 08/302,931
well as the recognition that gratings were formed in the
boron-doped core glass of Farries, it is apparent to us that
the art clearly would have recognized quickly the formation of
the refractive index patterns by spacially modulating them to
form the claimed gratings therein in the manner claimed.
Stated differently, the mere presence of the boron in the core
material of Farries would not have inhibited the artisan, in
our view, from utilizing such a glass for the core portion of
an optical fiber, since the teachings in Farries already
indicate that the core contains the germanium silica glass
which has already been known, in accordance with Legoubin and
appellants' admitted prior art in the noted portions of pages
1 and 2 of the specification as filed, to be photosensitive
and therefore provide the claimed gratings.
The specific wavelength peaks noted in claims 10, 12 and
13 and the range or band noted at the end of independent claim
14 and dependent claim 11 clearly would have been obvious to
the artisan because the prior art recognized such as indicated
at page 2 of appellants' specification as filed for germano-
silicate glasses.
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