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Class Information
Number: 181/163
Name: Acoustics > Diaphragm > Plural dependent diaphragms
Description: Subject matter wherein two or more diaphragms are driven by the same mechanism, or arranged so that the sound waves produced by one cause the other to vibrate.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7450976 |
Portable electronic device |
Nov. 11, 2008 |
| 7428946 |
Suspension and electro-acoustic transducer using the suspension |
Sep. 30, 2008 |
| 7392880 |
Dual range horn with acoustic crossover |
Jul. 1, 2008 |
| 7360626 |
Audio speaker with wobble free voice coil movement |
Apr. 22, 2008 |
| 7292702 |
In-wall speaker system method and apparatus |
Nov. 6, 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 |
| 7158648 |
Loudspeaker system with extended bass response |
Jan. 2, 2007 |
| 6985593 |
Baffle vibration reducing |
Jan. 10, 2006 |
| 6920230 |
Electromagnetic transducer and portable communication device |
Jul. 19, 2005 |
| 6814181 |
Electrically conductive damper device for speaker |
Nov. 9, 2004 |
| 6782112 |
Low frequency transducer enclosure |
Aug. 24, 2004 |
| 6766027 |
Elliptical flushmount speaker |
Jul. 20, 2004 |
| 6672423 |
Speaker and method of assembling the speaker |
Jan. 6, 2004 |
| 6627805 |
Audio device and method including a membrane having at least two tongues with different resonant frequencies |
Sep. 30, 2003 |
| 6578661 |
Speaker apparatus |
Jun. 17, 2003 |
| 6513623 |
Speaker |
Feb. 4, 2003 |
| 6460651 |
Passive speaker system |
Oct. 8, 2002 |
| 6454046 |
Synchronous dustproof cover structure for sound membrane |
Sep. 24, 2002 |
| 6431309 |
Loudspeaker system |
Aug. 13, 2002 |
| 6343128 |
Dual cone loudspeaker |
Jan. 29, 2002 |
| 6188774 |
Loudspeaker |
Feb. 13, 2001 |
| 6026929 |
High frequency radially arcuated center speaker cone with variable thickness |
Feb. 22, 2000 |
| 5880412 |
High frequency radially arcuated center speaker cone |
Mar. 9, 1999 |
| 5847332 |
Polycarbonate-based radially arcuated speaker cone |
Dec. 8, 1998 |
| 5802191 |
Loudspeakers, systems, and components thereof |
Sep. 1, 1998 |
| 5719946 |
Loudspeaker for higher audio frequencies and a manufacturing method thereof |
Feb. 17, 1998 |
| 5635686 |
Composite speaker system having a directional adjustable tweeter |
Jun. 3, 1997 |
| 5629501 |
Composite speaker system having a directional adjustable transducer |
May. 13, 1997 |
| 5512714 |
Composite speaker system having a directional adjustable tweeter |
Apr. 30, 1996 |
| 5471437 |
Electrodynamic acoustic transducer |
Nov. 28, 1995 |
| 5283397 |
Diaphragm for electrodynamic transducer |
Feb. 1, 1994 |
| 5143169 |
Loudspeaker diaphragm provided with a rear load |
Sep. 1, 1992 |
| 5025885 |
Multiple chamber loudspeaker system |
Jun. 25, 1991 |
| 4930596 |
Loudspeaker system |
Jun. 5, 1990 |
| 4905788 |
Electro-acoustic transducers |
Mar. 6, 1990 |
| 4899390 |
Thin speaker having an enclosure within an open portion and a closed portion |
Feb. 6, 1990 |
| 4875546 |
Loudspeaker with acoustic band-pass filter |
Oct. 24, 1989 |
| 4847908 |
Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
Jul. 11, 1989 |
| 4815560 |
Microphone with frequency pre-emphasis |
Mar. 28, 1989 |
| 4799264 |
Speaker system |
Jan. 17, 1989 |
| 4764968 |
Disk diaphragm for a loudspeaker |
Aug. 16, 1988 |
| 4714133 |
Method and apparatus for augmentation of sound by enhanced resonance |
Dec. 22, 1987 |
| 4700177 |
Sound generating apparatus with sealed air chamber between two sounding plates |
Oct. 13, 1987 |
| 4595801 |
Coupled dual cone velocity driver speaker |
Jun. 17, 1986 |
| 4585090 |
Isotrophic loudspeaker |
Apr. 29, 1986 |
| 4554414 |
Multi-driver loudspeaker |
Nov. 19, 1985 |
| 4532383 |
Electroacoustic transducer having a variable thickness diaphragm |
Jul. 30, 1985 |
| 4517416 |
Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam |
May. 14, 1985 |
| 4504703 |
Electro-acoustic transducer |
Mar. 12, 1985 |
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