Appeal No. 1997-4336
Application No. 08/279,317
“single phase liquid spin solution.” (Emphasis added.)
Further, it is equally significant that appealed claim 20
recites the amount for the
co-solvent spin liquid as “greater than 10 weight percent.”
In this regard, the specification explains as follows:
Additionally, the co-solvent spin liquid must be
added to the hydrocarbon spin liquid in an amount
greater than 10 weight percent of the total
hydrocarbon spin liquid and the co-solvent spin
liquid present in order that the co-solvent spin
liquid may act as a true
co-solvent and not as a nucleating agent. [Emphasis
added; specification, p. 13, ll. 3-7.]
Thus, in the appellants’ claimed invention, the co-solvent
spin liquid must act as a true co-solvent and not a
precipitating (or nucleating) agent.
By contrast, Fenton describes the use of various
compounds including alcohols as a precipitating agent or non-
solvent for the polyolefin resin. (Column 3, lines 29-36;
column 4, lines
7-22.) Even Fenton’s Example 1, which is specifically relied
upon in the examiner’s answer, teaches that the isopropanol
acts as a precipitating solvent when combined with a solution
containing the polyolefin and a low polynuclear aromatic
5
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007