Appeal No. 95-4570
Application No. 08/047,188
(a) making at least first and second differently colored
toner powders having substantially uniform physical
characteristics;
(b) introducing the first and second toner powders in
desired proportions into a fluidized bed;
(c) uniformly mixing the first and second toner powders
together in the fluidized bed;
(d) applying a substantially uniform electrostatic charge to
the toner powders in the fluidized bed; and
(e) applying the electrostatically charged mixture of toner
powders to a substrate to form uniform non-primary color symbols
on the substrate.
The examiner relies upon the following references as
evidence of obviousness:
Fotland et al. (Fotland) 4,777,106 Oct. 11, 1988
Christy et al. (Christy) 5,532,100 July 2, 1996
(filed Jan. 9, 1991)
Appellants' claimed invention is directed to a method of
applying a non-primary color print to a substrate utilizing
electrostatic imaging technology. The method entails introducing
first and second differently colored toner powders having
substantially uniform physical characteristics into a fluidized
bed, uniformly mixing the toner powders and applying a
substantially uniform electrostatic charge to the mixed powders,
and applying the electrostatically charged mixture to a
substrate. According to appellants, whereas it has been
difficult in the past to apply a uniform charge to a mixture of
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