Appeal No. 96-1739
Application 08/227,301
This is a decision on the appeal under 35 U.S.C. § 134
from the examiner’s rejection of claims 25 and 28-35. Claims
1-24, 26 and 27 have been cancelled. Claim 36 was also
rejected by the examiner, however, appellant has indicated
that the appeal with respect to claim 36 is dropped [brief,
page 1].
The invention pertains to a method for avoiding short
circuit cancellation of acoustical energy from opposite sides
of a low frequency piston loudspeaker. Specifically, a planar
open cell foam having a uniform cross section is selected and
attached to the front of the loudspeaker cone so that the
acoustic radiation coming out of the foam is 180 degrees out
of phase with respect to the front of the piston loudspeaker
and in phase with respect to the rear side of the piston
loudspeaker.
Representative claim 25 is reproduced as follows:
25. A method for avoiding short circuit cancellation of
acoustical energy from opposite sides of a low frequency
piston loudspeaker, the method comprising the steps of:
a) providing a low frequency piston loudspeaker with the
piston being in a cone shape supported by a frame, the
loudspeaker having a diameter of at least twelve inches, the
cone having a front side and a rear side activatable for
acoustically moving air;
2
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