| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 02/20/1991 | EP0413086A1 Electro-acoustic transducer |
| 02/20/1991 | CN2071856U Earplug type telephone receiver and transmiter |
| 02/19/1991 | US4993511 Speaker |
| 02/19/1991 | US4993510 Mobile speaker fixing device |
| 02/19/1991 | CA1280390C Sealed chambers |
| 02/19/1991 | CA1280376C Stereophonic soundbox |
| 02/13/1991 | EP0412902A2 Electroacoustic device for hearing needs including noise cancellation |
| 02/13/1991 | EP0412462A2 Audio/video apparatus with foldable flat screen |
| 02/13/1991 | CN2071409U Metal vibration diaphragm playback box |
| 02/12/1991 | US4993065 Accessory communication device for telephone sets |
| 02/12/1991 | US4991688 Audio speaker system |
| 02/12/1991 | US4991687 Speaker system having directivity |
| 02/11/1991 | CA2022888A1 Electroacoustic device for hearing needs including noise cancellation |
| 02/07/1991 | WO1991001544A2 Vehicular sound reproducing |
| 02/07/1991 | DE4019530A1 Communications head set e.g. for conference - includes earpiece and microphone with adjustable ear and chin supports |
| 02/07/1991 | DE3924801A1 Loudspeaker casing - made of folded out pattern of specified plastic foam |
| 02/06/1991 | EP0411786A1 Vehicular sound reproducing |
| 02/05/1991 | US4991222 Sound reproducer |
| 02/05/1991 | US4991221 Active speaker system and components therefor |
| 02/05/1991 | US4991220 Elastic |
| 02/05/1991 | US4990816 Piezoelectric capsule with resilient conducting holding means |
| 02/05/1991 | US4989271 Headphone cushioning |
| 02/05/1991 | CA1279923C Speaker seal |
| 01/31/1991 | DE3924708A1 Mechano-cutaneous sound transmission using multiple spatial patterns - excited by vibrating magnets in concealed pectoral appts. with microphone and control unit worn as brooch |
| 01/30/1991 | EP0410352A2 Loudspeaker system |
| 01/30/1991 | CN1048859A Preparation method of long-term effective health care film for telephone |
| 01/29/1991 | US4989254 Electro-acoustic transducer and manufacturing process |
| 01/29/1991 | US4989187 Acoustic apparatus |
| 01/24/1991 | WO1991001074A1 Loudspeaker enclosure |
| 01/23/1991 | EP0409475A1 Multiple chamber loudspeaker system |
| 01/23/1991 | EP0409360A2 Sound output system |
| 01/23/1991 | CN2070067U Small-sized efficiency electromagnetic sounder |
| 01/22/1991 | US4987601 Acoustic apparatus |
| 01/22/1991 | US4987592 Microphone boom assembly for communication headset |
| 01/22/1991 | US4987564 Acoustic apparatus |
| 01/22/1991 | CA1279270C Sound reproducing apparatus for use in vehicle |
| 01/18/1991 | CA2021243A1 Vehicular sound reproducing |
| 01/17/1991 | DE4019529A1 Headset outfit microphone mount and 2 earphones - has hoop shaped to fit over helmet with transducers held clear of outermost plane of ear |
| 01/17/1991 | DE3923126A1 Lautsprecherbox Speaker |
| 01/17/1991 | DE3922393A1 Loudspeaker box with adjacent disc-shaped plastics sections - provides variation of tone with different numbers of sections of easily and cheaply mfd. structure |
| 01/17/1991 | DE3922185A1 Loudspeaker group for telephone conferences - has group of vertically spaced loudspeakers, each with cover, penetrating radiation region of superimposed loudspeaker |
| 01/17/1991 | DE3921903A1 Cylindrical loudspeaker cabinet mfd. from fired clay mixt. - is assembled from sections of pipe, into which loudspeakers are secured by fixtures of same material |
| 01/15/1991 | US4985925 Active noise reduction system |
| 01/15/1991 | US4984653 Loudspeaker arrangement |
| 01/15/1991 | CA2021162A1 Multiple chamber loudspeaker system |
| 01/10/1991 | WO1991000682A1 Stand for audio components |
| 01/08/1991 | US4984278 Adjustable mount for a loudspeaker |
| 01/08/1991 | US4984222 Piezoelectric sensor comprising at least one pair of flexible sensitive elements of great length |
| 01/07/1991 | WO1991001075A1 Electrodynamic sound generator for a hearing aid |
| 01/07/1991 | CA2062796A1 Electrodynamic sound generator for hearing aid |
| 01/03/1991 | DE4019645A1 Loudspeaker with several loudspeakers - has several loudspeaker housing in common casing, each housing with preset vol. |
| 01/03/1991 | DE3920060A1 Loudspeaker housing with acoustically damped resonator opening |
| 01/03/1991 | DE3920038A1 Loudspeaker housing with acoustically damped resonator opening |
| 01/01/1991 | US4982436 Dual horn folded soundpath loudspeaker |
| 01/01/1991 | US4981194 Use in the concha of a human ear |
| 12/27/1990 | WO1990016142A1 Ported automotive speaker enclosure apparatus and method |
| 12/27/1990 | WO1990016135A1 Loudspeaker device |
| 12/27/1990 | EP0403900A2 Electroacoustical loudspeaker device |
| 12/27/1990 | EP0403701A1 Combination headset having adjustable means for positioning speakers to combine ambient and speaker sounds |
| 12/27/1990 | EP0346324B1 Device for producing light effects |
| 12/27/1990 | CA1278369C Acoustic transducer system |
| 12/27/1990 | CA1278159C Method and apparatus for manufacturing an otoplastic |
| 12/25/1990 | US4980926 Voice communication unit |
| 12/25/1990 | US4979586 Acoustically shielded motorcycle helmet speaker enclosure |
| 12/18/1990 | US4979220 Integral body speaker with detachable terminal plate |
| 12/18/1990 | US4978880 Piezoelectric capsule with flat supporting surface and resilient holding means |
| 12/18/1990 | US4977975 Vented motorcycle helmet speaker enclosure |
| 12/13/1990 | WO1990015513A1 Multi-driver loudspeaker system |
| 12/13/1990 | WO1990015406A1 Device for electroacoustic amplification of a stringed instrument with a tail piece |
| 12/13/1990 | DE3923741C1 Sound source detecting microphone - has vibration sensor on piston surface facing surface exposed to sound signals in form of flat diaphragm reducing wind noise |
| 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 |
| 12/13/1990 | CA2058449A1 Device for electroacoustic amplification of a stringed instrument with a tail piece |
| 12/11/1990 | US4976255 Apparatus for extracorporeal lithotripsy using shock waves and therapeutic ultrasound |
| 12/06/1990 | DE3917912C1 String instrument with electroacoustic amplification - has microphone installed inside body of violin or viola by flexible suspension |
| 12/05/1990 | EP0401027A2 An acoustic transducer |
| 12/05/1990 | EP0400597A2 Loudspeaker with bayonet fixing |
| 12/05/1990 | EP0400506A2 Thermoplastic resin composition |
| 12/05/1990 | EP0400497A1 Device in acoustic transmitters |
| 12/05/1990 | EP0400133A1 Sound reflection unit and audio loudspeaker unit comprising such a sound reflection unit |
| 12/05/1990 | CN2067048U Sterilizing pad for telephone |
| 12/04/1990 | US4975967 Earplug for noise protected communication between the user of the earplug and surroundings |
| 12/04/1990 | US4975966 Reducing microphone puff noise |
| 12/04/1990 | US4975965 Loudspeaker design |
| 12/04/1990 | US4974698 Speaker cover grille installation |
| 12/04/1990 | CA1277414C Broadband longitudinal vibrator transducer |
| 12/02/1990 | CA2017382A1 Acoustic transducer |
| 11/29/1990 | WO1990014737A1 Piezoceramic transducer for telephone instruments |
| 11/29/1990 | WO1990014170A1 Ultrasonic probe |
| 11/29/1990 | DE4002987A1 Loudspeaker terminal plate fastener - has first terminal plate with fastening aperture and pair(s) of integral, raised sections |
| 11/28/1990 | CN1047224A 超声波探头 Ultrasonic probe |
| 11/22/1990 | EP0398595A2 Image derived directional microphones |
| 11/22/1990 | DE3916496A1 Automobile loudspeaker unit |
| 11/20/1990 | US4972492 Earphone |
| 11/20/1990 | US4972491 Ear-mic headset/eardefender |
| 11/20/1990 | US4972488 Ear wax barrier and acoustic attenuator for a hearing aid |
| 11/15/1990 | DE3915205A1 Loudspeaker housing - has individual auxiliary loudspeakers supported within auxiliary housing units attached to sides of main loudspeaker unit |
| 11/15/1990 | DE3915204A1 Loudspeaker housing - has auxiliary individual loudspeakers pivoted about axis adjacent edge of front panel |
| 11/15/1990 | CA2016583A1 Ultrasonic probe |
| 11/13/1990 | CA1276285C Multidriver loudspeaker |
| 11/13/1990 | CA1276283C Unidirectional second order gradient microphone |