Appeal 2007-1168
Application 10/211,407
27. With reference to Sorrick Figure 1, shown below,
Sorrick teaches a three-layer filter 10 having a top layer 12 of needle felt, an
intermediate layer 14 of meltblown material, and a substrate layer 16 of
"SMS material." (Sorrick at 3:46–52.)
28. Sorrick instructs that in a preferred embodiment, the top layer of
needle felt [12] "includes a thickness of between 0.030 and 0.050 inches."
(Sorrick at 3:61–62.)
29. The metric conversions of 0.030 and 0.050 inches are 0.076 cm
and 0.127 cm, respectively.
30. According to Sorrick, the intermediate meltblown material [14] is
preferably polypropylene having a density of approximately 1.0 ounces per
square yard. (Sorrick at 4:8-10.)
31. Sorrick instructs further that in the preferred embodiment the
intermediate meltblown layer has a thickness of between 0.016
8
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