Appeal No. 1999-2241
Application No. 08/714,914
fluoride substantially insoluble in water" (24); an O-ring
preferably made of plastic material (26); an elongated, tubular
container or stem open at both ends (22); a collar (28) having an
annular flange (27) which press-fits the membrane (24) to the
O-ring (26) when the collar is threaded onto the container or
stem (22); a reference electrolyte (30); a reference electrode
(32); and a coaxial cable (36). (Figure 1; column 2, line 32 to
column 3, line 10; column 3, lines 19-28 and 43-56.) According
to Frant, an O-ring (i.e., a gasket) and a sealing compound are
alternatives for the purpose of mounting the membrane (24) onto
the container or stem (22). (Column 2, lines 53-60.) In this
regard, the appellants further acknowledge that Frant discloses
or suggests an electrode having an adhesive seal on one side of
the membrane and a gasket on the other side. (Appeal brief, page
8.)
Thus, the appellants do not dispute the examiner's finding
(examiner's answer, page 3) that Frant describes each and every
element of appealed claim 21 except for the use of a second
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