Appeal No. 1997-1371
Application 08/213,290
Prior art cited by the examiner as evidence of obviousness
C. The examiner relies upon Griggs as the primary reference.
1. Griggs teaches digesting wood chips to produce brownstock pulp and weak
black liquor (col. 1, line 56, through col. 2, line 45; col. 11, lines 10-60).
2. Griggs describes washing the brownstock pulp and extracting the weak
black liquor (col. 2, lines 46-66).
3. Griggs discloses introducing the brownstock pulp into an oxygen
delignification stage utilizing an oxygen containing stream (col. 11, line 60,
through col. 16, line 14).
4. Griggs shows the subsequent step of introducing the brownstock pulp into
an ozone bleaching stage utilizing an ozone/oxygen containing stream and
producing a waste stream (col. 16, line 15, through col. 20, line 45). It
appears that the waste stream would principally contain water vapor,
carbon dioxide, ozone, and oxygen because water vapor would have come
from the water in the pulp and from oxidation of wood-based materials,
carbon dioxide would come from oxidation as well, and both ozone and
oxygen would have been leftover from the ozone/oxygen stream.
D. There are differences between the teachings of Griggs and the claimed
invention.
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