Appeal No. 96-1739
Application 08/227,301
b) attaching planar open cell foam having a uniform cross
section and comprising randomly oriented contractible cells
either directly to the front side of the cone or to the frame
in front of the cone to enclose a volume of air between the
front side of the piston loudspeaker and the open cell foam
such that the open cell foam is energizable responsive to
activation of the piston loudspeaker;
c) activating the piston loudspeaker at a low frequency
such that all points of the cone surface move in phase to
acoustically move air towards the open cell foam;
d) engaging the foam with the acoustically moved air such
that the contractible cells contract and the foam becomes
elastically stiff, and thereby energizing the foam with the
acoustically moved air such that the foam acoustically
radiates one hundred and eighty degrees out of phase with
respect to the front side of the piston loudspeaker and in
phase with respect to the rear side of the same piston
loudspeaker to thereby avoid short circuit cancellation of
acoustical energy.
The examiner relies on the following references:
Broadley 3,187,832 June 08,
1965
Long 3,735,336 May 22,
1973
Pohlmann et al. (Pohlmann) 4,161,995 July 24,
1979
King 4,387,787 June 14,
1983
Claims 25 and 28-35 stand rejected under 35 U.S.C. §
112, second paragraph, for failing to particularly point out
and distinctly claim the invention. Claim 25 also stands
3
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