Appeal No. 1997-0646
Application 08/383,667
which increases the attractive force between the particles
themselves or between the particles and an electrode, and
which preferably is capable of forming hydrogen bonds or
strong dipoles (col. 2, lines 54-62). Carter teaches that one
class of such compounds is polyols such as pentaerythritol,
poly(ethylene glycol) and poly(vinyl alcohol), and that the
compound also can be poly(ethylene oxide) (col. 3, lines 1-2).
The examiner argues (answer, page 6) that Carter
discloses that both poly(vinyl alcohol) and poly(ethylene
oxide) can be used to coat the particles, and that appellants’
specification (page 11, lines 15 and 19) states that these
compounds both are preferred charge control agents.
Appellants’ specification (page 11, lines 13-20) states that
the desirable charge control agents for positive charging
include polyvinyl alcohol, and that the desirable charge
control agents for negative charging include polyethylene
oxide. Appellants’ claim 1 requires that both a charge
control agent for positive charging and a charge control agent
for negative charging are used. The examiner has not
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