Appeal No. 1997-1752
Application No. 08/451,379
1. A process for the preparation of colored toners
consisting essentially of mixing a first toner consisting
essentially of resin, pigment particles, charge additive, and
surface additives of zinc stearate and fumed silica, each
present in an amount of from about 0.4 to about 0.8 weight
percent, with a second toner consisting essentially of resin,
pigment particles, and charge additive, and wherein the
resulting colored toners contain from about 0.2 to about 0.3
weight percent of said zinc stearate and from about 0.2 to
about 0.3 weight percent of said fumed silica.
The examiner relies upon the following references as
evidence of obviousness:
Gruber et al. (Gruber) 4,965,158 Oct. 23, 1990
Nash et al. (Nash) 5,510,220 Apr. 23, 1996
(filed Jan. 27, 1995)
Handbook of Imaging Materials 169 (Arthur S. Diamond ed.,
Marcel Dekker, Inc. 1991) (Diamond)
Appellants' claimed invention is directed to a process
for preparing colored toners. The process involves mixing a
first toner, consisting essentially of resin, pigment, charge
additive and surface additives, with a second toner consisting
essentially of the same components minus the surface
additives. The surface additives of the first toner are zinc
stearate and fumed silica.
Appealed claims 1, 4-25 and 28-33 stand rejected under
35 U.S.C. § 103 as being unpatentable over Nash in view of
Diamond and Gruber.
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