Appeal 1997-1635
Application 08/319,667
[I]f the matter is first treated with a strongly acidic
cation-exchange resin at first, it can be treated with a
primary amine *** as it is because the strongly acidic
cation-exchange resin and the treated solution can be
simply separated.
The treatment solution thus obtained is purified by
distillation, etc. according to ordinary methods.
26. Japan contains several examples. "Actual
Example 1" (page 7) describes a process of adding a strongly
acidic cation-exchange resin to impure methacrylic acid
followed by addition of tetraethylene pentamine [an amine
which contains both primary and secondary amino groups]
followed by distillation.
27. "Actual Example 21" (page 12) describes a
process of adding sulfuric acid to an impure methacrylic acid
followed by distillation. Thereafter the amine is added and a
second distillation occurs.
28. Differences, if there be any, are discussed in
the Discussion portion of this opinion.
B. Discussion
1. Scope of applicants' claim 1
We are told in applicants' Appeal Brief (page 4) that
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