Appeal No. 1998-3168
Application No. 08/420,730
teaches a process for recovering heat energy by utilizing the
vapor stream from a digester to produce pure steam for uses
"such as the operation of evaporators, paper mill dryers and
also during the preheating period for the operation of
digesters" (page 1, column 1, lines 37-39). Accordingly,
based on the collective teachings of Elmore and Dean, we are
convinced that it would have been obvious for one of ordinary
skill in the art to modify the system of Elmore by using the
hot black liquor to form
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