Appeal No. 96-3854
Application No. 08/027,872
upon the surface of the filter medium. The extent of
particulate deposition may be observed on the surface of the
filter medium through a viewing port 32. See col. 2, lines
61-71. Madden further discloses that
after the sample has been observed, valves 22 and 18 are re-
opened to establish fluid flow through the chamber 24 over the
surface of filter medium 26 for the purpose of cleaning the
surface of filter medium 26 between sampling periods (col. 2,
lines 29-38 and col. 3, line 73 through col. 4, line 3).
It is well-established that before a conclusion of
obviousness may be based on a combination of references, the
examiner must show that some objective teaching or suggestion
in the applied prior art, or knowledge generally available in
the art, would have led those of ordinary skill to combine the
teachings of the references to arrive at the claimed
invention. Pro-Mold and Tool Co. v. Great Lakes Plastics
Inc., 75 F.3d 1568, 1573, 37 USPQ2d 1626, 1629 (Fed. Cir.
1996); In re Fritch, 972 F.2d 1260, 1266, 23 USPQ2d 1780, 1784
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