Appeal No. 94-4172
Application 08/001,854
an infrared sensitive silver halide emulsion layer and a
hydrophilic colloid protective layer. The protective layer
comprises colloidal silica having an average particle size lower
than 15 nanometers wherein the colloidal silica is present at a
coverage of from 20 to 70 grams per 100 grams of the hydrophilic
colloid in the protective layer. According to the appellants’
specification, this colloidal silica improves exposure latitude
and maximum optical density. The appealed subject matter is
adequately illustrated by independent claim 1 which reads as
follows:
1. An infrared sensitive photographic element comprising an
opaque film support, an infrared sensitized silver halide
emulsion layer and a hydrophilic colloid protective layer on one
side of the film support, characterized in that the protective
layer comprises colloidal silica having an average particle size
lower than 15 nanometers wherein the colloidal silica is present
at a coverage of from 20 to 70 grams per 100 grams of the
hydrophilic colloid in the protective layer.
The references relied upon by the examiner as evidence of
obviousness are:
Parton et al. (Parton) 4,975,362 Dec. 4, 1990
Muenter et al. (Muenter) 5,013,642 May 7, 1991
Inoue et al. (Inoue) 5,108,872 Apr. 28, 1992
All of the claims on appeal stand rejected under 35 USC
§ 103 as being unpatentable over Inoue in view of Muenter or
2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007