| Patents for H04R 9 - Transducers of moving-coil, moving-strip, or moving-wire type (11,486) |
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| 11/21/1989 | US4881617 Radially arcuated speaker cone |
| 11/16/1989 | WO1989011201A1 Loudspeaker |
| 11/15/1989 | EP0341926A1 Loudspeaker |
| 11/02/1989 | EP0339855A2 Electrodynamic loudspeaker |
| 11/02/1989 | EP0339820A2 Electromagnetic transducer |
| 11/02/1989 | EP0339425A2 Speaker system |
| 09/26/1989 | US4869765 Production process of bobbin for voice coil |
| 09/26/1989 | CA1261462A1 Audio-frequency electromechanical vibrator |
| 09/20/1989 | EP0333411A2 Headphone assemblies |
| 09/19/1989 | US4868882 Loudspeaker |
| 09/06/1989 | CN1035406A Sound device composed of structure-symmetrized power amplifier and speaker |
| 08/30/1989 | CN2043811U Car loudspeaker regulated with transistors |
| 08/24/1989 | WO1989007876A1 Improved audio transducer with controlled flexibility diaphragm |
| 08/24/1989 | DE3804024A1 Loudspeaker |
| 08/22/1989 | US4860370 Magnetically suspended acoustical speaker |
| 08/22/1989 | US4860369 Flat speaker unit |
| 08/15/1989 | CA1258519A1 Moving-coil loudspeaker unit |
| 08/08/1989 | US4856071 Planar loudspeaker system |
| 08/02/1989 | CN2042265U Two-way sound-transmitting thin loadspeaker |
| 07/11/1989 | US4847908 Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
| 07/11/1989 | US4847904 Ambient imaging loudspeaker system |
| 06/29/1989 | DE3828634A1 Acoustic information device and warning device in a vehicle |
| 06/15/1989 | DE3740653A1 Wide-band sound transducer system |
| 06/06/1989 | US4837838 Electromagnetic transducer of improved efficiency |
| 05/30/1989 | US4835429 Flexible printed cable connected to an inner most end of motor coil |
| 05/17/1989 | CN2037909U Speaker with compound vibration plate stimulated by multiple sources |
| 05/10/1989 | CN2037515U 音圈 Coil |
| 05/09/1989 | US4829582 Electrodynamic transducer |
| 05/09/1989 | US4829581 Electrodynamic transducer comprising a two-part diaphragm |
| 05/03/1989 | EP0313560A1 Membrane system with flexion-resistant rotationally symmetric plate for use as a sound reflecting or receiving element. |
| 05/03/1989 | CN2037132U Flat loudspeaker |
| 05/02/1989 | US4825533 Method of making a voice coil with rectangular coil wire and foil leads |
| 04/20/1989 | WO1989003633A1 Bobbin for voice coil |
| 04/11/1989 | US4821331 Coaxial speaker unit |
| 04/11/1989 | US4821330 Wide-band loudspeaker having a diaphragm area divided into sub-areas for various frequency ranges |
| 04/06/1989 | WO1989003160A1 Centering device for speaker diaphragm |
| 03/28/1989 | US4817165 Acoustic speaker device with a diaphragm having a spider web type core |
| 03/28/1989 | CA1251740A1 Soundstage boundary expansion system |
| 03/07/1989 | US4811313 Loudspeaker and audio reproduction apparatus |
| 02/21/1989 | US4807295 Loudspeaker |
| 02/15/1989 | CN2032781U Electrodynamic loudspeaker |
| 02/07/1989 | US4803733 Loudspeaker diaphragm mounting system and method |
| 01/26/1989 | WO1989000798A1 Sound transducer |
| 01/26/1989 | DE3723171A1 Explosion-protected sound transducer |
| 01/25/1989 | EP0300555A1 Electroacoustic transducer comprising a superconducting element |
| 01/18/1989 | EP0299116A1 Moving coil activator |
| 01/17/1989 | US4799266 Electroacoustic converter |
| 01/11/1989 | CN2030784U New-type ribbon microphone |
| 01/10/1989 | US4797935 Speaker system with independently supported top plate |
| 01/05/1989 | DE3720949A1 Membrane (diaphragm) for electroacoustic transducer systems |
| 01/03/1989 | US4795369 Electrical connector apparatus for a loudspeaker motor |
| 12/21/1988 | EP0296139A2 Audio transducer |
| 12/20/1988 | US4792978 Planar loudspeaker system |
| 11/24/1988 | DE3715618C1 Electrodynamic loudspeaker |
| 11/08/1988 | US4783824 Speaker unit having two voice coils wound around a common coil bobbin |
| 10/27/1988 | DE3712212A1 Magnetostatic loudspeaker or headphones with flat diaphragm |
| 10/20/1988 | WO1988008239A1 Shallow loudspeaker |
| 10/12/1988 | EP0286154A1 Electrodynamic transducer |
| 09/14/1988 | EP0281774A2 Loudspeaker |
| 09/14/1988 | CN87205125U Wide frequency band high-fidelity loudspeaker |
| 08/31/1988 | EP0112383B1 Electro-acoustic transducer with diaphragm |
| 08/24/1988 | EP0170056B1 Electrical flat coil actuator |
| 08/24/1988 | CN87212605U Leave word apparatus for quest |
| 08/24/1988 | CN86208848U Electromagnetic amplifying microphone |
| 08/16/1988 | US4764968 Disk diaphragm for a loudspeaker |
| 07/12/1988 | US4757548 For transmitting sonic and physical vibrational impulses |
| 07/12/1988 | US4757547 Air cooled loudspeaker |
| 06/23/1988 | EP0214958A4 Method and devices for making electro-acoustic transducer apparatus. |
| 06/22/1988 | EP0272059A2 Loudspeakers and their production |
| 06/21/1988 | US4752963 Electroacoustic converter having a recessed step on the center pole |
| 06/15/1988 | EP0270981A2 Loudspeaker |
| 06/14/1988 | US4750257 Method for making a magnet transducer assembly |
| 06/07/1988 | US4750208 Audio-band electromechanical vibration converter |
| 05/18/1988 | CN86107860A Double-winding voice-coil speaker and its power amplifier circuit |
| 05/10/1988 | US4742887 Open-air type earphone |
| 05/04/1988 | CN87210819U Treble and bass loudspeaker |
| 04/21/1988 | WO1988002977A1 Arrangement in loud speakers |
| 04/12/1988 | US4737992 Compact electroacoustical transducer with spider covering rear basket opening |
| 04/06/1988 | EP0262729A1 Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
| 04/06/1988 | EP0262406A2 Electro-acoustic transducer with diaphragm and blank therefor |
| 04/05/1988 | US4736435 Ear piece transducer |
| 03/29/1988 | CA1234619A1 Percussion air motor |
| 03/22/1988 | US4732040 Electrodynamically producing ultrasonic waves |
| 03/09/1988 | EP0259199A1 Electrical connector for a loudspeakerdriver |
| 02/24/1988 | EP0256593A2 Loudspeaker system and loudspeaker for converting an n-bit digitalized electric signal into an acoustic signal |
| 02/02/1988 | US4723296 Electrodynamic transducer of the isophase or ribbon type |
| 02/02/1988 | US4722517 Mechanical spring having negative spring stiffness useful in an electroacoustic transducer |
| 01/28/1988 | DE3622988A1 Telecontrol system |
| 01/20/1988 | CN87202554U Dynamic damping electric loudspeaker |
| 01/20/1988 | CN87200813U Thin loudspeaker |
| 01/20/1988 | CN87200654U Multigap magnetic path non-inductive voice coil electricity-driven loudspeaker |
| 01/19/1988 | US4720868 Dynamic transducer device |
| 01/19/1988 | US4720867 Woofer system for an automotive audio system with a protecter therefor |
| 01/14/1988 | WO1988000424A1 Bobbin for voice coils |
| 01/14/1988 | WO1988000423A1 Membrane system with flexion-resistant rotationally symmetric plate for use as a sound reflecting or receiving element |
| 01/13/1988 | CN87206536U Color-light loudspeaker |
| 01/12/1988 | CA1231433A1 Ribbon speaker system |
| 01/06/1988 | CN87202224U Low eddy-loss dynamic loudspeaker |
| 12/31/1987 | CN87201318U Dc speaker |
| 11/19/1987 | EP0245397A1 A magnetic system |