Interference No. 104,403
the images of the composite image, it is necessary to change the other
image as well. At col. 3, lines 13 to 16, Rosenthal ‘727 teaches that the
use of independent replaceable composite images allows one to
replace one of the images on the surface without replacing the second
image. In our view, a person of ordinary skill in the art would have been
motivated to modify the invention reduced to practice to obtain the
advantage of being able to replace one of the images which forms the
composite image without replacing the other image.
Rosenthal ‘727 teaches that the images on a lenticular lens may
be formed by printing, i.e. applying ink to the lenticular lens itself (col. 5,
lines 46 to 52). U.S. Patent No. 4,920,039 to Fotland at col. 4, lines 28
to 31; col. 5, lines 3 to 6; Fig. 1 teaches that pigment may be applied to
a planar portion of a lenticular lens sheet to form the image in a
lenticular lens system. It would have been obvious to a person of
ordinary skill in the art to form the image of the invention reduced to
practice on August 14, 1992 by transferring ink to the planar portions as
recited in claim 4 as this was a well known way of forming the image as
evidenced by the teachings of Rosenthal ‘727 and Fotland.
The feature recited in claims 6 and 8 of utilizing a plurality of
parallel diffractive lenses on a lenticular sheet would have been obvious
in view of the teaching in the prior art such as U.S. Patent 4,993,790
49
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