Appeal No. 94-1098
Application 07/712,581
Appellants’ invention pertains to a method “for generating a
chemical vapor stream having a preselected vapor concentration
suitable for use in calibrating vapor detectors and/or providing
a reference for use in evaluating the performance of different
vapor detectors” (specification, page 2). Independent claim 1 is
illustrative of the appealed subject matter and reads as follows:
1. A method of generating a stream containing a
preselected concentration of vapor of a chemical for use in a
vapor detector, said method comprising the steps of:
providing a column;
providing said chemical on a substrate in the column;
controlling the temperature within a zone of the column to
within approximately 0.1 EC of a preselected temperature to
provide a concentration of said vapor within the zone;
passing a carrier gas at a controlled rate through the
column to mix with the vapor and form said stream containing the
preselected concentration of vapor; and
directing the stream from the column to the vapor detector.
Claim 25, the other independent claim on appeal, is similar
to claim 1 except that instead of calling for the step of
controlling the temperature in the column to within approximately
0.1 EC of the preselected temperature to provide a concentration
of vapor, claim 25 calls for the step of controlling the
temperature in the column to provide a saturation concentration
2
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