| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 10/03/1989 | US4871502 Method for manufacturing an otoplastic |
| 09/28/1989 | DE3902866A1 Loudspeaker enclosure for hifi amplifier systems |
| 09/27/1989 | EP0334238A2 Acoustic Apparatus |
| 09/27/1989 | EP0334219A2 Contact microphone |
| 09/27/1989 | EP0334217A2 Method and apparatus of expanding acoustic reproduction range |
| 09/26/1989 | US4870691 Load and dispersion cell for sound |
| 09/26/1989 | US4870630 Desk with removable program playing device |
| 09/26/1989 | US4869340 Very high performance loudspeaker enclosures |
| 09/26/1989 | CA1261462A1 Audio-frequency electromechanical vibrator |
| 09/26/1989 | CA1260603A1 Ultrasound transducer |
| 09/20/1989 | EP0333411A2 Headphone assemblies |
| 09/20/1989 | EP0333133A2 Speaker system |
| 09/20/1989 | EP0332760A2 Acoustic window and material therefor |
| 09/20/1989 | CN2044784U Multifunctional earphone plug |
| 09/19/1989 | US4868888 Audio communications module for an office chair |
| 09/19/1989 | US4868882 Loudspeaker |
| 09/19/1989 | US4868799 Means for equalizing the internal pressure in an underwater transducer employing a vibratile piston to permit operation of the transducer at water depths in excess of a few hundred feet |
| 09/19/1989 | US4867267 Hearing aid transducer |
| 09/13/1989 | EP0332053A2 Acoustic apparatus |
| 09/13/1989 | CN1035598A Modular microphone assembly |
| 09/12/1989 | US4866780 Loudspeaker unit |
| 09/12/1989 | US4866683 Integrated acoustic receiver or projector |
| 09/12/1989 | US4866682 Transducer device |
| 09/12/1989 | US4865153 Speaker system |
| 09/07/1989 | DE3817848C1 Loudspeaker for insertion into a wall opening in a motor vehicle |
| 09/07/1989 | DE3804542A1 Loudspeaker connection with strain relief |
| 09/06/1989 | EP0331566A1 Cylindrical acoustic wave guide |
| 09/06/1989 | EP0330805A1 Accessory to fit on telephones and intercoms to avoid contagions |
| 09/05/1989 | US4864646 Neckstrap |
| 09/05/1989 | US4864619 Stereo headset-headband assemblies for headphones |
| 09/05/1989 | US4864610 Earpiece for a telephone headset |
| 08/31/1989 | DE3820244C1 Loudspeaker housing |
| 08/30/1989 | EP0330364A2 Modular microphone assembly |
| 08/30/1989 | EP0330319A2 Loudspeaker enclosure |
| 08/30/1989 | CN2043810U Bactericidal film of earphone |
| 08/30/1989 | CN2043809U Speaker for interview |
| 08/29/1989 | US4862508 Method for large-scale multiple source sound reinforcement |
| 08/29/1989 | US4862507 Microphone acoustical polar pattern converter |
| 08/29/1989 | US4862430 Wide pass band elastic wave omnidirectional transducer |
| 08/29/1989 | US4862278 Video camera microphone with zoom variable acoustic focus |
| 08/24/1989 | WO1989007875A1 Nonresonant sound transducer/radiator system |
| 08/23/1989 | EP0126420B1 A speech recognition system |
| 08/22/1989 | US4860369 Flat speaker unit |
| 08/22/1989 | US4860368 Acoustic transducers with improved frequency response |
| 08/22/1989 | US4860367 Low frequency loud speaker |
| 08/22/1989 | US4860365 Method of fractionating the sound restoration of modulated signals in parallel mounted transducers, and sets of corresponding transducers |
| 08/22/1989 | US4860363 Loudspeaker system |
| 08/22/1989 | US4860362 Hearing aid and method for making it |
| 08/22/1989 | US4858719 Pressure gradient pickup |
| 08/15/1989 | US4858206 Ring-shell projector |
| 08/15/1989 | US4856118 Headphone cushioning |
| 08/15/1989 | CA1258519A1 Moving-coil loudspeaker unit |
| 08/09/1989 | CN2042648U Absorption holding microphone |
| 08/08/1989 | US4856089 Combined eye covering and ear covering assembly |
| 08/08/1989 | US4856087 Radio equipped inflatable device |
| 08/08/1989 | US4856086 Radio glasses |
| 08/08/1989 | US4856071 Planar loudspeaker system |
| 08/08/1989 | US4856070 Retractable 2 way microphone |
| 08/02/1989 | EP0326476A1 Fibre-optical hydrophone, and antenna comprising a series of hydrophones |
| 08/02/1989 | EP0326040A2 Microphone with acoustic frequency pre-emphasis |
| 08/02/1989 | CN2042264U Noise-proof communicating ear cover |
| 08/01/1989 | US4853966 Speaker mounting system |
| 08/01/1989 | US4853965 Flexible joint mechanism |
| 08/01/1989 | US4853964 Electroacoustic apparatus for reproducing lowest to medium frequencies |
| 07/27/1989 | DE3800871A1 Wideband sound transducer |
| 07/27/1989 | DE3800855A1 Vibration-compensated electrodynamic sound transducer drive |
| 07/26/1989 | EP0324837A1 Loudspeaker system with wide dispersion baffle |
| 07/26/1989 | CN2041875U Coaxial double-frequency composite loudspeakers |
| 07/25/1989 | US4852178 Speaker retaining assembly |
| 07/25/1989 | US4852163 Telephone mouthpiece cover |
| 07/25/1989 | US4851654 IC card |
| 07/25/1989 | US4850452 Loudspeaker structure |
| 07/24/1989 | EP0292518A4 A composite sonar transducer for operation as a low frequency underwater acoustic source. |
| 07/19/1989 | EP0324232A2 Loudspeaker enclosure |
| 07/19/1989 | CN2041475U Perfume disinfection telephone |
| 07/19/1989 | CN1034106A Tubular piezo-electric sensor with high sensitivity |
| 07/18/1989 | US4850016 Microphone |
| 07/18/1989 | US4850015 Vehicular steering wheel telephone apparatus |
| 07/18/1989 | US4849946 Piezo-electric transducer comprising several coaxial sensitive elements |
| 07/18/1989 | US4848858 Mobile stand-type loudspeaker set installing device |
| 07/13/1989 | WO1989006479A1 Hygienic covers for telephones |
| 07/13/1989 | DE3744614A1 Loudspeaker combination |
| 07/11/1989 | USRE32980 Device for rhythmically driving an electromechanical vibrator |
| 07/11/1989 | US4847908 Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
| 07/11/1989 | US4847907 Speaker system for radiating acoustic energy into a cabin of a motor vehicle |
| 07/11/1989 | US4847904 Ambient imaging loudspeaker system |
| 07/06/1989 | DE3843050A1 Electric acoustic transducer |
| 07/05/1989 | EP0323305A1 High-sensitivity tubular piezo-electric sensor |
| 07/05/1989 | EP0322686A2 Acoustic apparatus |
| 07/05/1989 | EP0322679A2 Acoustic apparatus |
| 07/05/1989 | CN1033728A Acoustical waveguide trausducing |
| 07/04/1989 | US4845760 Electro-acoustic transducer arranged within the handset of a telephone instrument |
| 07/04/1989 | US4845759 Sound source having a plurality of drivers operating from a virtual point |
| 07/04/1989 | US4844198 Plane wave focusing lens |
| 06/29/1989 | DE3743339A1 Electroacoustic transducer, particularly for underwater application |
| 06/27/1989 | US4843628 Inertial microphone/receiver with extended frequency response |
| 06/27/1989 | US4843624 Portable enclosure system for audio equipment |
| 06/27/1989 | US4843367 Car's back-up alarm fitted with speech function |
| 06/22/1989 | DE3840766A1 Stereophonic recording device for improving the three-dimensional hearing |
| 06/21/1989 | EP0321150A2 Collapsible ear tip |