| Patents for H04R 1 - Details of transducers (42,173) |
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| 02/07/1990 | EP0353226A1 Housing for an entertainment electronics appliance. |
| 02/07/1990 | CN1039517A Piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length |
| 02/06/1990 | US4899390 Thin speaker having an enclosure within an open portion and a closed portion |
| 02/06/1990 | US4898260 Loudspeaker mounting with integral back wave filter and wave modulating plate of same design |
| 02/06/1990 | CA1265362A1 High frequency resonator for welding material |
| 02/01/1990 | DE3825997A1 Bass loudspeaker enclosure |
| 01/31/1990 | EP0353092A2 Apparatus and method for reproducing high fidelity sound |
| 01/31/1990 | CN2052176U New-type interview microphone |
| 01/31/1990 | CN2052175U Sound system having electronic magic lamp |
| 01/30/1990 | US4897877 Sub-woofer driver combination with dual voice coil arrangement |
| 01/25/1990 | DE3824140A1 Fixing and electrical bonding of piezoceramics |
| 01/25/1990 | DE3823482A1 Loudspeaker arrangement |
| 01/24/1990 | EP0351863A2 Exterior structure for cabinet |
| 01/24/1990 | EP0351461A1 Bone conduction audio listening device and method |
| 01/17/1990 | EP0351285A1 Piezo electric detector with at least two long, sensitive, supple elements |
| 01/17/1990 | CN1038915A Telescopic aerial having integrative speaker |
| 01/16/1990 | US4893695 Speaker system |
| 01/11/1990 | WO1990000340A1 Headphone with microphone |
| 01/09/1990 | US4893344 Headset having a post auricle mount and arranged to be worn on a person's outer ear |
| 01/09/1990 | US4893343 Dual diverging manifold loudspeaker system |
| 01/09/1990 | CA1264371A1 Flexible piezoelectric transducer assembly |
| 01/03/1990 | EP0348677A2 Telescopic aerial with integrated microphone |
| 01/03/1990 | EP0348467A1 Natural headphones for conducting the human voice to the auditory system |
| 01/02/1990 | US4891842 Sound output unit for installation in a ceiling structure |
| 01/02/1990 | US4891796 Icing preventive device for ultrasonic wave transmitting and receiving unit for vehicle |
| 01/02/1990 | US4890689 Omnidirectional speaker system |
| 12/28/1989 | WO1989012946A1 Passive loudspeaker enclosure for television receiver |
| 12/28/1989 | WO1989012432A1 Active noise reduction system |
| 12/27/1989 | EP0347730A1 Passive loudspeaker box for a television receiver |
| 12/27/1989 | CN1038386A Loudspeaker arrangement |
| 12/27/1989 | CA1264082A1 Electrostatic discharge protector for an electret microphone |
| 12/26/1989 | US4889303 Flexible arm retainer device |
| 12/26/1989 | US4889235 Stacking and surface protection device on a protective housing made of a synthetic material |
| 12/26/1989 | US4889208 Speaker enclosures |
| 12/21/1989 | DE3820747A1 Loudspeaker unit |
| 12/20/1989 | EP0346324A1 Device for producing light effects. |
| 12/19/1989 | US4888807 Variable pattern microphone system |
| 12/19/1989 | US4888804 Sound reproduction system |
| 12/19/1989 | US4887693 Wind and breath noise protector for microphones |
| 12/19/1989 | US4887690 Speaker grille assembly |
| 12/14/1989 | DE3818931A1 Loudspeaker box |
| 12/13/1989 | EP0345804A2 Hydrostatic speaker and speaker driver |
| 12/13/1989 | CN2049148U Child toy mike |
| 12/13/1989 | CN1006114B Human head vibration simulator |
| 12/12/1989 | US4887300 Pressure gradient microphone |
| 12/07/1989 | DE3819217A1 Loudspeaker system |
| 12/06/1989 | EP0345167A1 Device for applying decorative and protective grids or plates to appliances, in particular to electrical and electronic appliances |
| 12/06/1989 | EP0344975A2 Electro acoustic transducer and loudspeaker |
| 12/06/1989 | EP0344974A2 Electro acoustic transducer and loudspeaker |
| 12/06/1989 | CN2049056U Multipurpose microphone for meeting |
| 12/05/1989 | US4885782 Single and double symmetric loudspeaker driver configurations |
| 12/05/1989 | US4884655 Tower-type speaker cabinet with pivoted plural speaker subassembly |
| 12/05/1989 | CA1263738A1 Method of producing electroacoustic converters, preferably microphones and converters produced according to the method |
| 12/05/1989 | CA1263737A1 Ear microphone utilizing displacement type bone vibration and method of manufacture thereof |
| 11/30/1989 | DE3818552A1 Vibration damping in loudspeaker housings by means of the bracing connection of opposite housing walls |
| 11/29/1989 | CN2048653U Health cover for telephone mouth piece |
| 11/23/1989 | EP0198028B1 Electrical acoustic assembly including a device for the retention, acoustic sealing and vibration isolation of an electroacoustic converter |
| 11/22/1989 | CN2048228U Ceramic assembly sound box |
| 11/21/1989 | US4882769 AM/FM radio with sunglass housing |
| 11/21/1989 | US4882760 Sound reproduction system |
| 11/21/1989 | US4882745 Cordless headset telephone |
| 11/21/1989 | US4882716 Optic fiber hydrophone and antenna associating a series of hydrophones |
| 11/21/1989 | US4882562 Adaptor for coupling plural compression drivers to a common horn |
| 11/16/1989 | WO1989011201A1 Loudspeaker |
| 11/16/1989 | WO1989011198A1 Sound installation, particularly stereophonic installation for television sets with integrated low frequency loud-speaker with large dimensions |
| 11/15/1989 | EP0342117A1 Sound system, in particular a stereophonic one, for television receivers with an integrated large-sized woofer |
| 11/15/1989 | EP0341926A1 Loudspeaker |
| 11/15/1989 | EP0191836B1 Movable apparatus for sound wiring and/or visualization |
| 11/15/1989 | CN2047871U All plastic sealed loudspeaker for uncerwater and steam bathroom |
| 11/14/1989 | US4881265 Apex loudspeaker |
| 11/14/1989 | US4880077 Base for a loudspeaker enclosure |
| 11/14/1989 | US4880012 Ultrasonic probe |
| 11/09/1989 | DE3841946A1 Loudspeaker device |
| 11/09/1989 | DE3248459A1 Acoustic underwater antenna |
| 11/08/1989 | EP0340435A2 Acoustic apparatus |
| 11/08/1989 | EP0340265A1 Electro-acoustic transducers |
| 11/07/1989 | US4878561 Sound emitter |
| 11/07/1989 | US4878560 Earmold |
| 11/02/1989 | EP0339855A2 Electrodynamic loudspeaker |
| 11/02/1989 | EP0339425A2 Speaker system |
| 11/02/1989 | DE3907895A1 Directional microphone |
| 10/31/1989 | US4878207 Composite sonar transducer for operation as a low frequency underwater acoustic source |
| 10/31/1989 | US4877105 Rear speaker unit for a motor vehicle |
| 10/25/1989 | EP0338481A2 Folding loudspeaker box |
| 10/24/1989 | US4876724 Personal sound system |
| 10/24/1989 | US4876723 Loudspeaker system |
| 10/24/1989 | US4876715 Sanitizing device for a telephone |
| 10/24/1989 | US4875546 Loudspeaker with acoustic band-pass filter |
| 10/18/1989 | EP0337575A2 Ultrasonic probe and manufacture method for same |
| 10/12/1989 | DE3810713A1 Protective helmet |
| 10/11/1989 | EP0336859A1 Piezo-electric unit with lateral electrical connector pincers |
| 10/11/1989 | EP0336303A2 Acoustic apparatus |
| 10/11/1989 | EP0335892A1 Method for correcting the amplitude/frequency response of an electro-acoustic transducing system and corresponding transducer assembly. |
| 10/10/1989 | US4872527 Speaker system |
| 10/10/1989 | CA1262275A1 Extendible sonobuoy apparatus |
| 10/05/1989 | DE3909011A1 Stethoscope earpieces |
| 10/05/1989 | DE3809349A1 Protective container for a hydrophone |
| 10/05/1989 | DE3809340A1 Stand for an entertainment electronics device |
| 10/04/1989 | EP0334843A1 Loudspeaker installation. |
| 10/04/1989 | CN2045564U Speaker with music rhythm and festoon lighting |