Appeal 1997-1635
Application 08/319,667
h. "JP-A 117 716/75", which is mentioned in
applicants' specification (page 3, lines 14-16), would appear
to be a reference to Japanese Patent Application Document
No. 50-117716 bearing a date of 16 September 1975. The only
copy in the record is in Japanese. Accordingly, we have had
no occasion to consider "JP-A 117 716/75" in deciding the
appeal.
Japanese Patent Application Document No. 03-3646
21. Japanese Patent Application Document No. 03-3646
(hereinafter Japan) describes a method for purification of
methacrylic acid obtained by a gas-phase catalytic oxidation
process using (1) sulfonic acid group-containing compounds and
(2) primary or secondary amines (page 2, first paragraph; page
3, third paragraph).
22. According to Japan, it had been known to use
sulfonic acid group-containing compounds to purify methacrylic
acid (page 3, second paragraph). In this respect, reference
is made in Japan to yet another Japanese Patent Application
Document, identified as Japan Kokai 55-129239.
23. The sulfonic acid group-containing compounds
include benzenesulfonic acid, p-toluenesulfonic acid and
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