Appeal No. 1998-3001
Application No. 08/318,645
Independent claim 8 specifies a method for producing a
dust bag comprising, inter alia, providing a first layer of
air-permeable filter material and a second layer of air-
permeable material resistant to mechanical stresses, the
second layer being narrower than the first layer, placing a
third layer of air-permeable filter material on the second
layer, and welding the sequence of layers together along a
continuous edge line.
We fully comprehend the examiner’s assessment of the
applied teachings and how the examiner perceives that the
evidence of obviousness would have been suggestive of the
claimed invention.
However, as more specifically explained below, we are of the
view that, absent appellant’s own teaching and reliance upon
hindsight, the applied patents themselves simply would not
have been suggestive of the claimed dust bag and method.
The Gin patent teaches a filter bag formed by seaming a
suitable layered fabric 50 that includes an inner micro-fiber
layer 51 and first and second outer support layers. The
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