Appeal No. 2002-0148
Application No. 09/104,675
layer unit after an imagewise white light exposure and
process that enables development of all layer units.
The specification, page 2, lines 1-3, also defines “exposure
latitude” as follows:
The term “exposure latitude” indicates the exposure range of
a characteristic curve segment over which instantaneous
gamma (∆D/∆logE) is at least 25 percent of gamma, as defined
above.
With these definitions in mind, we proceed to the
appellants’ arguments. Initially, we note that the contention
regarding the exposure latitude has no merit.
Bohan expressly teaches that it is preferable that the color
film have “an exposure latitude of at least about 1.5 log E,
preferably having an exposure latitude of at least about 2 log E,
more preferably having an exposure latitude of at least about 2.5
log E, and most preferably having an exposure latitude of at
least about 3.0 log E.” (Bohan, column 12, lines 4-9). The
preferred (and most preferred) ranges in Bohan overlap the
claimed range, and therefore we are not persuaded by this
argument.
Turning to the gamma ratio, the examiner has found that it
would have been obvious to prepare a multilayer color
photographic material of the type exemplified by Bohan having a
thickness of less than 30 µm, comprising a DIR compound, layer
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