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Class Information
Number: 181/146
Name: Acoustics > Plural diaphragm sound sources > With sound-asborbing means
Description: Subject matter including sound absorbent material associated therewith for preventing undesirable effects.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8630435 Apparatus incorporating an adsorbent material, and methods of making same Jan. 14, 2014
8397860 Speaker enclosure Mar. 19, 2013
8333261 Compact subwoofer cabinet Dec. 18, 2012
8256566 Speaker enclosure Sep. 4, 2012
8201659 Recoilless speaker system Jun. 19, 2012
8167083 Reconfigurable loudspeaker enclosure May. 1, 2012
8139784 Compound loudspeaker Mar. 20, 2012
7325649 Loudspeaker with progressively damped acoustical chamber Feb. 5, 2008
7320520 Portable multimedia projection system Jan. 22, 2008
6658121 Headphone having an adjustable localization of auditory events Dec. 2, 2003
6571909 Loudspeaker enclosure Jun. 3, 2003
6504938 Dual-chamber loudspeaker Jan. 7, 2003
6243477 Audio system with partitioned input and output compartments Jun. 5, 2001
6073723 Acoustic damping material Jun. 13, 2000
6015025 Diffuser panel with built-in speaker arrangement and methods of installation Jan. 18, 2000
5988314 Sound output system Nov. 23, 1999
5909014 Low frequency equaphase surround loudspeaker Jun. 1, 1999
5895896 Fluid coupled subwoofer acoustic enclosure system with port chamber Apr. 20, 1999
5815589 Push-pull transmission line loudspeaker Sep. 29, 1998
5731555 Loudspeaker enclosure having a low reflection/low diffraction baffle Mar. 24, 1998
5731552 Speaker system with sound absorbing diaphragm Mar. 24, 1998
5525767 High-performance sound imaging system Jun. 11, 1996
5514841 Reflex compression valve - divided chamber loudspeaker cabinet May. 7, 1996
5388162 Sound innovation speaker system Feb. 7, 1995
5324896 Audio loudspeaker system Jun. 28, 1994
5261006 Loudspeaker system comprising a helmholtz resonator coupled to an acoustic tube Nov. 9, 1993
5229555 Speaker system and TV with the same Jul. 20, 1993
5067159 Structure of a speaker apparatus Nov. 19, 1991
4964482 Loudspeaker enclosure Oct. 23, 1990
4944019 Low sound region reproducing speaker system Jul. 24, 1990
4924964 Loudspeaker enclosure May. 15, 1990
4905788 Electro-acoustic transducers Mar. 6, 1990
4893695 Speaker system Jan. 16, 1990
4869340 Very high performance loudspeaker enclosures Sep. 26, 1989
4850452 Loudspeaker structure Jul. 25, 1989
4837839 Compact speaker assembly with improved low frequency response Jun. 6, 1989
4837837 Loudspeaker Jun. 6, 1989
4819761 Tubular loudspeaker system Apr. 11, 1989
4805728 Sound system with anechoic enclosure Feb. 21, 1989
4802551 Loudspeaker unit Feb. 7, 1989
4799264 Speaker system Jan. 17, 1989
4690244 Loudspeaker enclosures Sep. 1, 1987
4640381 Wall-mounted resin speaker cabinet Feb. 3, 1987
4638884 Chambered headrest mounting for stereophonic loudspeakers Jan. 27, 1987
4593784 Loudspeaker enclosure Jun. 10, 1986
4591020 Loudspeaker enclosure with isolation of loudspeaker vibration May. 27, 1986
4580654 Portable sound speaker system Apr. 8, 1986
4574906 Outdoor speaker Mar. 11, 1986
4517416 Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam May. 14, 1985
4512434 Aerodynamic bass-reflex enclosure Apr. 23, 1985

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