Appeal No. 1996-1891
Application 08/058,478
throughout the housing from top to bottom." The band width is
determined by the packing density of the material:
When the line is stuffed with fibers, the band
of frequencies passed by the opening can be
broadened and shifted depending on the amount of
fiber stuffing and
also on the cross-sectional area of the passage.
Generally speaking, a passage with low stuffing
densities and large cross-sectional area will
produce a wider band width and have lower bass
extension and greater amplitude. Passages with
higher stuffing densities and small cross sectional
area will produce a narrower band width with reduced
low bass and lower amplitude, but with improved
transient response.
[Spear, col. 4, lines 9-20.]
For the foregoing reasons, we are reversing the rejection of
claim 9. We note that claim 9 further specifies that the
waveguide comprises a first set of parallel waveguide walls
generally perpendicular to the vibratile surface and a second
set of parallel waveguide walls generally parallel to the
vibratile surface. Appellant does not dispute the examiner's
reliance on Spear's horizontal walls 16 to satisfy the
requirement for a first set of parallel waveguide walls
generally perpendicular to the vibratile surface. However,
appellant does take issue with the examiner's reliance on the
parts of side walls 20 and 28 that are located between angled
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