| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 02/02/1988 | US4723289 Stereo electroacoustic transducing |
| 02/02/1988 | US4722517 Mechanical spring having negative spring stiffness useful in an electroacoustic transducer |
| 02/02/1988 | US4722418 Loudspeaker enclosure |
| 01/28/1988 | WO1988000787A1 Pressure gradient microphone |
| 01/28/1988 | EP0155266A4 Loudspeaker structure. |
| 01/21/1988 | DE3623101A1 Loudspeaker unit |
| 01/20/1988 | CN87202554U Dynamic damping electric loudspeaker |
| 01/19/1988 | US4720868 Dynamic transducer device |
| 01/19/1988 | US4720867 Woofer system for an automotive audio system with a protecter therefor |
| 01/19/1988 | US4720857 Miniaturized headset for two-way voice communication |
| 01/14/1988 | DE3624672C1 Enclosure for sound reproduction devices |
| 01/13/1988 | EP0252522A2 Sound reproducing apparatus for use in vehicle |
| 01/13/1988 | EP0252337A2 Omni-directional radiation horn-loudspeaker |
| 01/12/1988 | US4719322 Radio housing and expandable chassis with integral keypad and acoustic speaker seal |
| 01/12/1988 | US4718624 Folding microphone stand |
| 01/12/1988 | US4718517 Loudspeaker and acoustic transformer therefor |
| 01/12/1988 | US4718415 Breathing mask having a transducer movable parts coupled to a speaking diaphragm for speech transmission |
| 01/07/1988 | DE3621515A1 Loudspeaker, particularly a car loudspeaker |
| 01/05/1988 | US4718096 Speech recognition system |
| 01/05/1988 | CA1231169A1 Velocity hydrophone |
| 12/23/1987 | CN86209833U Antenna for audio frequency radio earphone |
| 12/22/1987 | US4714133 Method and apparatus for augmentation of sound by enhanced resonance |
| 12/17/1987 | DE3616563A1 Arrangement for bass loudspeakers with a horn |
| 12/10/1987 | DE3618967A1 Electro-acoustic transducer for telephone sets |
| 12/09/1987 | EP0248172A2 Stereophonic loudspeaker |
| 12/08/1987 | US4712244 Directional microphone arrangement |
| 12/01/1987 | CA1229907A1 Electroacoustic transducer with a piezoelectric diaphragm |
| 11/24/1987 | US4709361 Flexural disk transducer |
| 11/24/1987 | US4709359 End weighted reed sound transducer |
| 11/24/1987 | CA1229557A1 Speaker and grille installation clip mounting |
| 11/10/1987 | US4706295 Coaxial loudspeaker system |
| 11/10/1987 | US4706229 Electroacoustic transducer |
| 11/10/1987 | US4705981 Ultrasonic transducer |
| 11/04/1987 | EP0243591A2 Underwater transducer |
| 11/03/1987 | US4704729 Single acoustic box with spatial effect for stereophonic musical reproduction systems |
| 10/28/1987 | EP0242856A2 Coaxial loud speaker |
| 10/27/1987 | US4703508 Mounted in a hole in a cabinet wall for facilitating electrical connection |
| 10/27/1987 | US4703506 Directional microphone apparatus |
| 10/21/1987 | EP0148893B1 Integrated electroacoustic transducer |
| 10/21/1987 | CN87200245U Sound level regulator of basin-like electric horn |
| 10/21/1987 | CN87100983A Preparation of sterilizing and deodorising liquid for telephones |
| 10/20/1987 | US4701952 Frequency attenuation compensated pneumatic headphone and liquid tube audio system for medical use |
| 10/20/1987 | US4701951 Acoustic imager |
| 10/20/1987 | US4701658 Broadband acoustic point-contact transducer |
| 10/15/1987 | DE3710464A1 Schallabstrahlungssystem Sound radiation system |
| 10/14/1987 | CN87200144U Box-like two in one: receiver and microphone |
| 10/13/1987 | US4700397 Surveillance microphone holder |
| 10/13/1987 | US4700396 Sound-wave receiving appliance |
| 10/13/1987 | US4700395 Recreational cooler and speaker system |
| 10/13/1987 | CA1228151A1 Piezoelectric coaxial cable having a helical inner conductor |
| 10/08/1987 | DE3611120A1 Loudspeaker system for uniform all-round radiation of higher sound frequency components |
| 10/08/1987 | DE3608048A1 Flat housing for loudspeakers |
| 10/07/1987 | EP0239883A2 Television apparatus for monophonic sound reproduction |
| 10/07/1987 | CN87100528A Wide-band loudspeaker having diaphragm area divided into sub-areas for various frequency ranges |
| 10/06/1987 | US4697334 Method of producing electroacoustic converters, preferably microphones, and converters produced according to the method |
| 09/30/1987 | EP0238497A1 Stereophonic audio equipment carrier |
| 09/29/1987 | US4696370 Headrest-mounted acoustic device |
| 09/29/1987 | CA1227436A1 Loudspeaker system |
| 09/24/1987 | WO1987005773A1 Flextensional transducers |
| 09/24/1987 | WO1987005772A1 Sonar transducers |
| 09/24/1987 | WO1987005771A1 Flat housing for loudspeakers |
| 09/24/1987 | WO1987005748A1 Piezoelectric polymeric film balloon speaker |
| 09/24/1987 | WO1987005733A1 Adaptor for coupling plural compression drivers to a common horn |
| 09/24/1987 | DE3609490A1 Cylindrical holding body of elastic material |
| 09/22/1987 | US4696045 Ear microphone |
| 09/22/1987 | US4696037 Loudspeaker arrangement comprising one or more flat diaphragms |
| 09/22/1987 | US4695985 Apparatus for preventing a roundabout of supersonic wave in a supersonic wave transmitter and receiver for a vehicle |
| 09/17/1987 | DE3608049A1 Lautsprecherflachgehaeuse Lautsprecherflachgehaeuse |
| 09/17/1987 | DE3607987A1 Television receiver |
| 09/16/1987 | EP0236788A2 Microphone support |
| 09/15/1987 | US4694499 Directional microphone with acoustic washer |
| 09/15/1987 | US4694440 Underwater acoustic wave transmitting and receiving unit |
| 09/15/1987 | CA1226820A1 Pressure wave transducing |
| 09/01/1987 | US4691383 Compact radio |
| 09/01/1987 | US4691363 Transducer device |
| 09/01/1987 | US4690244 Loudspeaker enclosures |
| 08/27/1987 | WO1987004934A1 Sleep inducing device |
| 08/27/1987 | DE3630247C1 Electrodynamic loudspeaker |
| 08/27/1987 | DE3604497A1 Vertically adjustable stand, in particular for loud-speaker casings |
| 08/26/1987 | CN86202881U Double earspeakers fixable in cassette |
| 08/25/1987 | US4689822 Headset |
| 08/25/1987 | US4689773 For immersion in an external acoustic transmission medium |
| 08/25/1987 | US4688576 Ultrasonic transducer probe assembly |
| 08/24/1987 | EP0219529A4 Speaker adapted to corner-loaded installation. |
| 08/19/1987 | EP0232760A2 Broad band loudspeaker provided with a membrane surface divided into a plurality of parts corresponding to a plurality of frequency bands |
| 08/13/1987 | DE3604330A1 Built-in connecting terminal |
| 08/12/1987 | EP0232096A2 Acoustic transducers |
| 08/11/1987 | US4686409 Porous adaptation layer in an ultrasonic applicator |
| 08/04/1987 | US4685137 Microphone with non-symmetrical directivity pattern |
| 07/30/1987 | DE3601876A1 Loudspeaker unit |
| 07/29/1987 | EP0229981A1 Method for controlling the focussing characteristics of an ultrasonic field and device for carrying out said method |
| 07/29/1987 | EP0229795A1 Sound playback system for wearing as a headset |
| 07/28/1987 | US4683587 Submersible personal stereo |
| 07/22/1987 | EP0229230A1 Directional-microphone arrangement |
| 07/21/1987 | US4682363 Amphibious personal audio system |
| 07/15/1987 | EP0228832A1 Support member for pressure sensor |
| 07/14/1987 | US4680800 Moving-coil loudspeaker unit |
| 07/14/1987 | US4680492 Audio-frequency electromechanical vibrator |
| 07/14/1987 | US4679651 Loudspeaker enclosure |
| 07/08/1987 | EP0227985A2 Ultrasonic sensor |