WORLEY, Chief Judge.
Scholler appeals from the board's affirmance of the rejection of claims 35, 39, and 40 to 43 of his patent application.
The invention relates to a process of producing cellulose from cellulose-containing plant material, such as wood, straw, etc., by digesting said material under pressure at elevated temperatures in two stages. In the first stage the raw material is treated with a cooking liquor of progressively...
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