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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 5033093 |
Compact microphone and method of manufacture |
Jul. 16, 1991 |
| 4975318 |
Improved acoustic carbon diaphragm |
Dec. 4, 1990 |
| 4837839 |
Compact speaker assembly with improved low frequency response |
Jun. 6, 1989 |
| 4811816 |
Symmetric double phonic diaphragm volume-enhancing device |
Mar. 14, 1989 |
| 4768615 |
Acoustic transducer system |
Sep. 6, 1988 |
| 4761817 |
Diaphragm structure for a transducer |
Aug. 2, 1988 |
| 4709392 |
Dome speaker with a diaphragm having at least one elongated cut-out portion |
Nov. 24, 1987 |
| 4582163 |
Electro-acoustic transducer with high air permeable diaphragm |
Apr. 15, 1986 |
| 4532383 |
Electroacoustic transducer having a variable thickness diaphragm |
Jul. 30, 1985 |
| 4529059 |
Vibrating diaphragm type audible device with acoustically improved grille and method |
Jul. 16, 1985 |
| 4518443 |
Acoustic diaphragm |
May. 21, 1985 |
| 4471085 |
Diaphragm material for loudspeakers |
Sep. 11, 1984 |
| 4436966 |
Conference microphone unit |
Mar. 13, 1984 |
| 4434203 |
Diaphragm |
Feb. 28, 1984 |
| 4426556 |
Electrodynamic loudspeaker |
Jan. 17, 1984 |
| 4399334 |
Speaker unit for headphones |
Aug. 16, 1983 |
| 4379213 |
Electroacoustical converter |
Apr. 5, 1983 |
| D254490 |
Loudspeaker with grille |
Mar. 18, 1980 |
| D254434 |
Loudspeaker |
Mar. 11, 1980 |
| D254252 |
Loudspeaker |
Feb. 19, 1980 |
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