| Patents for H04R 9 - Transducers of moving-coil, moving-strip, or moving-wire type (11,486) |
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| 07/03/1991 | CN2080280U Electronic loudspeaker |
| 06/28/1991 | EP0444034A4 Electrodynamic transducer structure. |
| 06/25/1991 | US5027412 Voice coil with rectangular coil wire and foil leads |
| 06/22/1991 | WO1991010243A1 Coil assemblies |
| 06/18/1991 | US5025474 Speaker system with image projection screen |
| 06/11/1991 | CA1284837C Audio transducer |
| 06/04/1991 | US5021613 Ribbon loudspeaker |
| 05/30/1991 | WO1991007742A1 Improved audio transducer with controlled flexibility diaphragm |
| 05/21/1991 | US5018206 Network mounting device for coaxial type speaker |
| 05/08/1991 | CN1051280A Wide dimension tablet loud-speaker |
| 05/07/1991 | US5014323 Voice coil lead dressing |
| 05/02/1991 | WO1991006191A1 Improvements in or relating to loudspeakers |
| 04/30/1991 | US5012457 Aquatic transducer system |
| 04/25/1991 | DE3844702A1 Moving coil device for loudspeakers - uses conducting coil carrier in conjunction with extra winding |
| 04/24/1991 | EP0423161A1 Passive loudspeaker enclosure for television receiver |
| 04/18/1991 | WO1991005447A1 Improved electrodynamic loudspeaker |
| 04/17/1991 | EP0422424A2 Electrodynamic transducer |
| 04/16/1991 | US5008945 Water-proof speaker unit |
| 04/10/1991 | CA2027106A1 Electrodynamic transducer |
| 04/04/1991 | WO1991004643A1 Planar speakers |
| 04/03/1991 | CN1012316B Wide-band loudspeaker |
| 03/26/1991 | US5003610 Whole surface driven speaker |
| 03/26/1991 | US5003609 Whole-surface driven speaker |
| 03/20/1991 | CN1012122B Horn speaker |
| 03/07/1991 | DE3936639C1 Permanent magnet arrangement e.g. for vehicle loudspeaker - includes associated oscillatory coil arrangement to drive loudspeaker diaphragm |
| 03/02/1991 | CA2044605A1 Wide-ribbon loudspeaker |
| 02/27/1991 | CN2072300U Surface acting plane loudspeaker |
| 02/21/1991 | DE3940615C1 Double diaphragm moving coil loudspeaker - dynamically dampens resonant frequency by cross-coupling second coils of moving coils in opposite phase |
| 02/14/1991 | DE3923190A1 Tweeter loudspeaker with vibration drive - has line of conductive tracks, through which current flows in same direction, coupled by surrounding conductor |
| 01/29/1991 | US4989254 Electro-acoustic transducer and manufacturing process |
| 01/23/1991 | EP0409429A2 Loudspeaker drive unit |
| 01/23/1991 | CN2070068U Contactless electric loud-speaker |
| 01/07/1991 | WO1991001075A1 Electrodynamic sound generator for a hearing aid |
| 01/07/1991 | CA2062796A1 Electrodynamic sound generator for hearing aid |
| 12/27/1990 | EP0404488A2 Ribbon transducers |
| 12/27/1990 | EP0404487A2 Ribbon transducers |
| 12/26/1990 | CN1048138A Series magnetic circuit and electric circuit system of electroacoustic transducer |
| 12/25/1990 | US4980921 Magnetic system for dynamic loudspeaker |
| 12/18/1990 | US4979220 Integral body speaker with detachable terminal plate |
| 12/13/1990 | DE3918654A1 Loudspeaker with filter circuit between separately driven coils - has two moving coils rigidly coupled together in air gap of driver transducer connected to amplifier |
| 12/04/1990 | US4975965 Loudspeaker design |
| 11/29/1990 | DE4002987A1 Loudspeaker terminal plate fastener - has first terminal plate with fastening aperture and pair(s) of integral, raised sections |
| 11/21/1990 | CN1010543B Loud-speaker diaphragm of simple sound reproducer |
| 11/14/1990 | EP0397621A2 Movable-coil electrodynamic transducer with a diaphragm |
| 11/13/1990 | CA1276285C Multidriver loudspeaker |
| 11/11/1990 | CA2016478A1 Movable-coil electrodynamic transducer diaphragm |
| 11/06/1990 | US4967871 Body-sensible acoustic device |
| 11/01/1990 | WO1990013214A1 Self-cooled loudspeaker |
| 10/23/1990 | US4965839 Electro acoustic transducer and loudspeaker |
| 10/10/1990 | CN1046079A Moving-magnetic type electric loudspeaker |
| 10/02/1990 | US4961227 Portable loud speaker system |
| 09/27/1990 | DE3909353A1 Electrodynamic transducer |
| 09/12/1990 | CN1009611B Vibrating plate loudspeaker |
| 09/05/1990 | CN2061749U Induction pick up of television aural |
| 08/21/1990 | US4951270 Audio transducer apparatus |
| 08/21/1990 | US4951023 Electromagnetic drive apparatus having a flat coil |
| 07/26/1990 | DE3901745A1 Circuit for a loudspeaker having a number of voice coils |
| 07/18/1990 | EP0378337A2 Wire trap speaker terminal |
| 07/11/1990 | EP0377143A2 Loudspeaker voice coil |
| 07/04/1990 | EP0245397B1 A magnetic system |
| 07/03/1990 | US4939784 Loudspeaker structure |
| 06/28/1990 | DE3843051A1 Device for the direct conversion of digital signals into sound |
| 06/13/1990 | CN2058291U Elliptic loudspeaker |
| 06/12/1990 | US4933975 Dynamic loudspeaker for producing high audio power |
| 05/22/1990 | US4928312 Acoustic transducer |
| 05/17/1990 | WO1990005435A1 Shallow loudspeaker with slotted magnet structure |
| 05/15/1990 | US4926486 Transducer assembly for automatic message system |
| 05/08/1990 | US4924504 Audio speaker |
| 05/01/1990 | US4922541 Acoustic horn audio reproducer |
| 04/19/1990 | WO1990004317A1 Electrodynamic transducer structure |
| 04/11/1990 | EP0208907B1 Magnetic system for a dynamic loudspeaker |
| 04/10/1990 | US4915647 Wire trap speaker terminal |
| 04/05/1990 | WO1990003708A1 Electrodynamic-fluidic transducer element for pneumatic loudspeaker |
| 04/04/1990 | EP0362068A1 Electrodynamic-fluidic transducer equipment for a pneumatic loudspeaker |
| 04/03/1990 | US4914750 Sound transducer |
| 04/03/1990 | US4914707 Balanced vehicular speaker system |
| 03/29/1990 | DE3904373A1 Coil former for dynamic loudspeakers for reducing eddy current influences |
| 03/28/1990 | CN1040902A Loudspeaker |
| 03/28/1990 | CN1040901A Loudspeaker |
| 03/28/1990 | CN1040900A Plate-type loudspeaker |
| 03/27/1990 | US4912086 Voice coil and diaphragm |
| 03/15/1990 | DE3830461A1 Loudspeaker for a digital control signal |
| 03/15/1990 | DE3830082A1 Voice coil for an electromechanical transducer |
| 03/14/1990 | CN2054603U Moving-coil signal feedback loudspeaker |
| 03/07/1990 | EP0356433A1 Shallow loudspeaker |
| 02/21/1990 | CN1039944A Impedance-changable dynamic loudspeaker |
| 02/20/1990 | US4903308 Audio transducer with controlled flexibility diaphragm |
| 02/14/1990 | CN1039693A Auto-reflex loudspeaker |
| 02/13/1990 | US4901357 Electromagnetic transducer |
| 01/31/1990 | EP0353092A2 Apparatus and method for reproducing high fidelity sound |
| 01/30/1990 | US4897877 Sub-woofer driver combination with dual voice coil arrangement |
| 01/17/1990 | EP0350652A1 Electrodynamic loudspeaker |
| 01/10/1990 | CN2051030U Audio equipment with double voice-coil loud-speaker and self phase-reverse function |
| 12/28/1989 | WO1989012946A1 Passive loudspeaker enclosure for television receiver |
| 12/27/1989 | EP0347730A1 Passive loudspeaker box for a television receiver |
| 12/06/1989 | EP0344975A2 Electro acoustic transducer and loudspeaker |
| 12/06/1989 | EP0344974A2 Electro acoustic transducer and loudspeaker |
| 11/29/1989 | CN2048659U 扬声器 Speaker |
| 11/28/1989 | US4884262 Magnetic system for a stereo pick-up with a movable coil |
| 11/22/1989 | CN2048269U Loud-speaker |