Appeal No. 1997-3528
Application No. 08/230,659
that used in the measurements of Ducharme et al.
‘264 since there are inventors in common and these
measurements were made at IBM facilities and that an
irradiation time exceeding 12 minutes may have been
reached when recognizing that several measurements
are commonly made and averaged to produce a more
reproducible and accurate value for the
photoconductivity. [Emphases added; id.]
Even if we consider the collective teachings of the
applied prior art references in the light most favorable to
the examiner, they are insufficient to establish a prima facie
case of obviousness within the meaning of 35 U.S.C. § 103
against appealed claim 11.
Ducharme describes an amorphous or substantially
amorphous erasable photorefractive material comprising a
polymer, a non-linear optical chromophore, and a charge
transport agent. (Column 2, lines 25-32.) Also, Ducharme
teaches that the photoconductivity of the material may be
determined by applying a voltage across the material and
measuring with an ammeter the additional current that results
when the material is illuminated. (Column 10, lines 37-41 and
column 14, lines 28-42.) Further, Ducharme discloses that the
photorefractive diffraction efficiency can be measured by
using two mutually coherent interfering writing beams and a
9
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