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Class Information
Number: 181/157
Name: Acoustics > Diaphragm
Description: Subject matter including a vibratable partition which is designed to produce sound waves when driven.










Sub-classes under this class:

Class Number Class Name Patents
181/167 Critically defined material or coating 151
181/158 Microphone type 61
181/171 Mounting or suspension means 248
181/173 Particular shape 126
181/163 Plural dependent diaphragms 84
181/164 Sectional diaphragm 37
181/166 With damping means 96
181/161 With direct mechanical connection to drive unit 41
181/159 With horn 92
181/160 With resonant chamber 98


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8603207 Acoustic cleaning assembly for use in power generation systems and method of assembling same Dec. 10, 2013
8567555 Dual bore canalphone system Oct. 29, 2013
8503702 Electret diaphragm and speaker using the same Aug. 6, 2013
8320604 Composite loudspeaker cone Nov. 27, 2012
8256567 Diaphragm and speaker using same Sep. 4, 2012
8213671 Speaker Jul. 3, 2012
8191674 Acoustic loading device for loudspeakers Jun. 5, 2012
8139811 Speaker Mar. 20, 2012
8126179 Diaphragm and sound output apparatus Feb. 28, 2012
8094860 Portable sound box assembly Jan. 10, 2012
7946378 Membrane for an electroacoustic transducer May. 24, 2011
7913808 Waterproofing loudspeaker cones Mar. 29, 2011
7877856 Method of manufacturing a speaker Feb. 1, 2011
7866439 Membrane for an electroacoustic transducer Jan. 11, 2011
7686129 Acoustic horn having internally raised geometric shapes Mar. 30, 2010
7644801 Membrane with a high resistance against buckling and/or crinkling Jan. 12, 2010
7591344 Peripheral component for audio equipment Sep. 22, 2009
7475598 Electromechanical force transducer Jan. 13, 2009
7467686 Speaker diaphragms, manufacturing methods of the same, and dynamic speakers Dec. 23, 2008
7450976 Portable electronic device Nov. 11, 2008
7306073 Electroacoustic transducer comprising a membrane with a middle area comprising stiffening grooves Dec. 11, 2007
7225895 Audio speaker with wobble free voice coil movement Jun. 5, 2007
7185735 Audio speaker with wobble free voice coil movement Mar. 6, 2007
7174990 Tangential stress reduction system in a loudspeaker suspension Feb. 13, 2007
7045768 Displacement/quantity of light converter May. 16, 2006
6889796 Loudspeaker suspension May. 10, 2005
6863152 Low profile audio speaker Mar. 8, 2005
6851513 Tangential stress reduction system in a loudspeaker suspension Feb. 8, 2005
6814181 Electrically conductive damper device for speaker Nov. 9, 2004
6810126 Planar magnetic transducer Oct. 26, 2004
6745867 Loudspeaker drive unit Jun. 8, 2004
6732832 Speaker damper May. 11, 2004
6723913 Fan cooling of active speakers Apr. 20, 2004
6675931 Low profile audio speaker Jan. 13, 2004
6672423 Speaker and method of assembling the speaker Jan. 6, 2004
6626263 Passive speaker system Sep. 30, 2003
6591938 Speaker diaphragm Jul. 15, 2003
6578661 Speaker apparatus Jun. 17, 2003
6513623 Speaker Feb. 4, 2003
6460651 Passive speaker system Oct. 8, 2002
6059069 Loudspeaker waveguide design May. 9, 2000
6044925 Passive speaker Apr. 4, 2000
5721786 Loudspeakers Feb. 24, 1998
5701359 Flat-panel speaker Dec. 23, 1997
5689093 Cone of a speaker Nov. 18, 1997
5425002 Acoustic pressure pulse generator Jun. 13, 1995
5339286 Composite electroacoustic transducer Aug. 16, 1994
5304746 Reduction of standing waves and intermodulation distortion in electro-acoustic transducer Apr. 19, 1994
5251188 Elongated-pattern sonic transducer Oct. 5, 1993
5123053 Loudspeaker suspension Jun. 16, 1992

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