Appeal 2007-1384
Application 10/122,683
Appellant claims an apparatus for detecting oxygen which comprises
a pair of galvanic cells containing KOH as an electrolyte and an absorbent
material containing an aqueous sodium chloride solution for humidifying the
galvanic cells.
Representative claim 1 reads as follows:
1. An apparatus for detecting oxygen in a test gas flow through a
galvanic cell of the type which develops a current flow between a cell
cathode and anode representative of oxygen content in the test gas;
comprising:
a. a pair of galvanic cells inside a sealed enclosure, said cells
containing KOH as an electrolyte and connected in series gas flow
arrangement, with an input adapted for connection to a source of test gas and
an output adapted for connection to a gas exhaust;
b. means for electrically connecting said galvanic cells to provide
an electrical signal representative of the oxygen content of said gas flow;
and
c. an absorbent material inside said sealed enclosure, said
absorbent material containing an aqueous sodium chloride solution for
humidifying the galvanic cells.
The references set forth below are relied upon by the Examiner as
evidence of obviousness:
Mayer US 4,973,395 Nov. 27, 1990
Fitterman US 5,957,380 Sep. 28, 1999
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