Appeal No. 1999-0554
Application No. 08/657,903
6. An apparatus for measuring a silver or halogen ion
concentration, comprising:
a heat insulated bath containing a salt solution;
a reference electrode which is disposed in the heat
insulated bath[;]
a salt bridge having one end connected to an end portion
of said reference electrode;
a receptacle containing gelatin aqueous solution
containing silver halide crystals, a second end of said salt
bridge contacting said gelatin aqueous solution;
an indicator electrode, only one end portion of said
indicator electrode being immersed into the gelatin aqueous
solution containing silver halide crystals; and
a potentiometer which is electrically connected with said
reference electrode and another end portion of said indicator
electrode via a silver wire.
The examiner relies upon the following references as
evidence of obviousness:
Marks 2,370,871 Mar. 6, 1945
Sands 2,584,816 Feb. 5, 1952
Ingruber 2,846,386 Aug. 5, 1958
Oliver 3,031,304 Apr. 24, 1962
Light 3,806,439 Apr. 23, 1974
Grubb 3,833,495 Sep. 3, 1974
James L. Lingane, Electroanalytical Chemistry 362-63 (2d ed.,
Interscience Publishers, Inc., New York 1958)
Appellants' claimed invention is directed to an apparatus
for measuring the silver or halogen ion concentration in a
gelatin aqueous solution containing silver halide crystals.
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