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Class Information
Number: 181/196
Name: Acoustics > Sound-modifying means > Within tubular means
Description: Subject matter wherein a mechanical restriction or valve is located within a sound conducting tubular member.










Sub-classes under this class:

Class Number Class Name Patents
181/197 Adjustable 12


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8511422 Flexible multiple speaker support apparatus Aug. 20, 2013
8511424 Acoustic waveguide assemblies Aug. 20, 2013
8483421 Narrow-angle directional microphone Jul. 9, 2013
8453788 Implementing dynamic noise elimination with acoustic frame design Jun. 4, 2013
8434587 Tubular body soundproof cover and covered tubular body May. 7, 2013
8340337 Loudspeaker module Dec. 25, 2012
8184821 Acoustic transducer device May. 22, 2012
8132642 Speaker system Mar. 13, 2012
8094853 Speaker system and fitting device Jan. 10, 2012
7913814 Acoustic baffle assembly Mar. 29, 2011
7886867 Flexible multiple speaker support apparatus Feb. 15, 2011
7753163 Multi-frequency acoustic vibration transmission method and system Jul. 13, 2010
7654362 Speaker and method of outputting acoustic sound Feb. 2, 2010
7610991 Speaker and method of outputting acoustic sound Nov. 3, 2009
7610810 Methods for producing acoustic sources Nov. 3, 2009
7584820 Acoustic radiating Sep. 8, 2009
7565948 Acoustic waveguiding Jul. 28, 2009
7533760 Noise reduction tubes May. 19, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7350618 Multimedia speaker product Apr. 1, 2008
7311174 Cloth for loudspeaker diaphragm, loudspeaker diaphragm, and loudspeaker Dec. 25, 2007
6973994 Apparatus for increasing the quality of sound from an acoustic source Dec. 13, 2005
6549637 Loudspeaker with differential flow vent means Apr. 15, 2003
6513624 Loudspeaker enclosure Feb. 4, 2003
6450289 Noise attenuation device Sep. 17, 2002
6418229 Directional microphone, in particular having symmetrical directivity Jul. 9, 2002
6237642 Sealing-tight pipe with acoustic damping for the transport of gaseous fluids, and a method of producing the same May. 29, 2001
6199656 Casing for noise attenuation in a rock drilling rig Mar. 13, 2001
6148631 Silencer and air conditioner Nov. 21, 2000
6079515 Speaker enclosure Jun. 27, 2000
6001132 Preparation of aqueous solutions suitable for finishing cellulose containing textile materials Dec. 14, 1999
5946401 Linear speaker array Aug. 31, 1999
5872855 Multiple voice coil, multiple function loudspeaker Feb. 16, 1999
5844176 Speaker enclosure having parallel porting channels for mid-range and bass speakers Dec. 1, 1998
5802190 Linear speaker array Sep. 1, 1998
5673329 Omni-directional loudspeaker system Sep. 30, 1997
5664020 Compact full-range loudspeaker system Sep. 2, 1997
5657793 Vacuum cleaner hose and method for making same Aug. 19, 1997
5450495 Loudspeaker system Sep. 12, 1995
5353261 Vibrating apparatus Oct. 4, 1994
5294131 Audible arrow Mar. 15, 1994
5058169 Public address system Oct. 15, 1991
5032035 Platen roll core Jul. 16, 1991
5025886 Multi-ported and multi-directional loudspeaker system Jun. 25, 1991
4893695 Speaker system Jan. 16, 1990
4789044 Narrow directional microphone Dec. 6, 1988
4762150 Hose having orifice Aug. 9, 1988
4577536 Feed apparatus for automatic lathes Mar. 25, 1986
4349082 Acoustical damping element and method of forming same Sep. 14, 1982
4206831 Loudspeaker coupler Jun. 10, 1980

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