Appeal No. 96-3854
Application No. 08/027,872
to a take-up reel 17. See Figures 1 and 2 and col. 4, lines
1-60. In order to determine
the colloid index, Bach measures the time it takes for a
predetermined volume of sampling fluid to pass through the
membrane filter strip before and after sampling fluid has been
passed through the membrane filter strip for a test period T
(col. 4, line 63 through col. 5, line 34).
The Madden patent discloses an apparatus and method for
sampling the particulate contamination of a fluid flowing in a
conduit 10. The apparatus includes a sample-inflow port 12,
an upstream valve 18, a chamber 24 disposed above a filter
medium 26, a downstream valve 22 and a sample-outflow port 16.
The upper surface of the filter medium is disclosed as being
coplanar with the bottom of the chamber 24 (col. 2, lines 29-
31). When it is desired to sample the fluid, valve 18 is
opened and valve 22 is closed forcing the fluid through the
filter medium 26 and into a container 30 (col. 2, line 45-48).
Fluid flow through the filter medium during the sampling
period results in the deposition of particulate contaminants
8
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