| Patents for G10K 9 - Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers (3,562) |
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| 04/02/1992 | DE4130780A1 Electrically-driven acoustic shock wave source - has screening housing coupled to conductive coating of moving membrane |
| 03/31/1992 | US5101384 Acoustic devices |
| 03/29/1992 | WO1992006567A1 Acoustic transmitter |
| 03/24/1992 | US5099220 Waterproof flush mount marine horn assembly |
| 03/19/1992 | WO1992004134A1 Ultrasonic transducer for measuring the travel times of ultrasonic pulses in a gas |
| 03/18/1992 | EP0475343A2 Low frequency hydrophon |
| 03/12/1992 | DE4028315A1 Ultraschallwandler fuer die laufzeitmessung von ultraschall-impulsen in einem gas Ultrasonic transducer for the measurement of maturity ultrasound pulses in a gas |
| 03/11/1992 | EP0474029A2 Omnidirectional modular siren |
| 03/11/1992 | CN2098670U Music door bell with body height measurer |
| 03/04/1992 | EP0472971A2 Piezoelectric driver using resonant energy transfer |
| 02/26/1992 | CN2097477U Sound-control microlight music door bell |
| 02/20/1992 | WO1992002795A2 Ultrasonic transducer |
| 02/06/1992 | WO1992002012A1 Composite acoustic system for telephone hand-sets |
| 02/06/1992 | DE4120681A1 Ultraschallwandler Ultrasonic transducer |
| 01/07/1992 | US5078074 Vehicle horn |
| 12/18/1991 | EP0462037A1 Underwater electro-acoustic transducer |
| 12/18/1991 | EP0461287A1 Electrically-driven acoustic shock-wave generator |
| 12/12/1991 | WO1991006942A1 Electric horn with solid state driver |
| 12/10/1991 | US5072362 Apparatus for controlling a vessel's horn |
| 12/04/1991 | CN2090098U Steam loudspeaker with gasbag |
| 12/04/1991 | CN1056656A Integrated circuit horn for automobile |
| 12/03/1991 | US5069308 Low impedance down-hole acoustic source for well logging |
| 11/27/1991 | CN2089651U Protocol display sound |
| 11/27/1991 | CN2089359U Birds sing imitating device |
| 11/26/1991 | US5068836 Sound generating transducer |
| 11/21/1991 | EP0457211A2 Piezoelectric sound generator and process for its manufacture |
| 11/10/1991 | WO1991017539A1 Loading of flextensional transducer shells |
| 11/10/1991 | CA2079913A1 Loading of flextensional transducer shells |
| 11/06/1991 | CN2088317U Moon-imitating lamp |
| 10/31/1991 | WO1991016799A1 Transformed stress direction acoustic transducer |
| 10/30/1991 | CN2087803U Wireless type prenatal education apparatus |
| 10/23/1991 | EP0452427A1 Electric horn with solid state driver. |
| 10/22/1991 | US5058569 Apparatus for generating focused shockwaves having a cylindrical coil and a paraboloid of revolution reflector |
| 10/16/1991 | EP0451306A1 Frequency-selective laminated ultrasound transducer |
| 10/09/1991 | EP0450666A2 Electromagnetic signal horn |
| 10/09/1991 | EP0450364A2 Combination shock wave generator |
| 10/02/1991 | CN2085992U Integrated electronic door bell |
| 09/25/1991 | CN1054847A Electronic sound-producing device |
| 09/17/1991 | US5049853 Electric horn with solid state driver |
| 09/11/1991 | EP0446139A1 Acoustic alarm with aeration channel, particularly for motor vehicles |
| 08/22/1991 | WO1991012059A1 Noise making device |
| 08/21/1991 | EP0442278A1 Device for wet therapy with ultrasound |
| 08/07/1991 | CN2082446U Self-conversion direct-alternating current two purpose warning device |
| 07/25/1991 | WO1991010402A1 Device for contactless disintegration of stones in the human body |
| 07/24/1991 | CN1053316A Induction door bell |
| 07/11/1991 | DE4000585A1 Location transmitting meter for athletes - damped structure transmits ultrasonic signal from electroacoustic transducer and has photoelectric transducer for light signal |
| 07/09/1991 | US5030873 Monopole, dipole, and quadrupole borehole seismic transducers |
| 07/02/1991 | US5029148 Flextensional |
| 07/02/1991 | CA1285646C Barrel stave projector |
| 06/26/1991 | EP0434344A2 Edge driven flexural transducer |
| 06/25/1991 | US5025789 Shock wave source having a central ultrasound locating system |
| 06/19/1991 | CA2032044A1 Edge driven flexural transducer |
| 06/12/1991 | CN1052081A Electric horn for automobiles |
| 06/11/1991 | US5022341 Horn |
| 06/06/1991 | DE3939387A1 Ultrasonic distance warning system esp. for motor vehicles - has aperture covering membrane carrying piezo-plate to eliminate group echos |
| 06/05/1991 | CN1052001A Sound channel blocking-prevention method for slight type resonant sounder and circular sound channel sounder |
| 05/29/1991 | EP0428533A1 Low frequency sound generator, especially for grills |
| 05/14/1991 | US5016228 Sonar transducers |
| 05/08/1991 | DE3937028A1 Electrical bell with memory and playback facility - uses endless loop cassette with microphone to provide variety signals |
| 05/07/1991 | CA1283867C Adaptor for coupling plural compression drivers to a common horn |
| 05/02/1991 | EP0424936A2 High-temperature resistant piezoelectric transducer and process for production thereof |
| 04/10/1991 | EP0421613A2 Sound generating transducer |
| 04/10/1991 | EP0421062A1 Flat coil |
| 04/09/1991 | US5005511 Air-driven low-frequency sound generator with positive feedback system |
| 04/03/1991 | CN2074489U Piezoelectric sensing probe |
| 03/27/1991 | CN2074047U Small size electric drum type buzzer |
| 03/20/1991 | CN2073611U 话筒式警报器 Microphone type siren |
| 03/12/1991 | US4999819 Transformed stress direction acoustic transducer |
| 03/12/1991 | US4998499 Underwater pneumatic horn |
| 03/06/1991 | CN2072717U Multi-functional anti-stealing anti-violence electronic door bell |
| 02/20/1991 | CN2071819U Alarm device at water boiling |
| 02/19/1991 | CA1280390C Sealed chambers |
| 02/13/1991 | EP0412202A1 Shock wave generator to produce focused shock waves with a reflector shaped as a paraboloid of revolution |
| 02/13/1991 | CN2071315U Fully automatic multifunctional protector of refrigerator |
| 02/05/1991 | US4989302 Method for manufacturing piezoelectric buzzer |
| 01/09/1991 | CN2069156U Electronic magneto loud speaker |
| 12/05/1990 | EP0400497A1 Device in acoustic transmitters |
| 11/27/1990 | US4973941 Electronic sound generating device |
| 11/21/1990 | CN2066176U Miniature electronic sound device |
| 11/20/1990 | US4970983 Connection to a pressurized fluid container |
| 11/14/1990 | CN2065790U Mechanical electronic music bell for time signal |
| 11/13/1990 | US4970706 Flextensor transducer |
| 11/07/1990 | CN2065087U Vibrating and sound-producing means of toy machine gun |
| 11/06/1990 | US4967684 Warning device |
| 10/30/1990 | CA1275726C Electroacoustic calling device |
| 10/24/1990 | CN2064529U Quadratically sound-controlled electronic music doorbell |
| 10/23/1990 | US4965483 Piezoelectric buzzer |
| 10/17/1990 | CN2064093U Birthday cake music device |
| 10/16/1990 | US4964106 Flextensional sonar transducer assembly |
| 10/16/1990 | US4963855 Warning sound generating device |
| 10/03/1990 | EP0254104B1 Shock-wave generator for producing an acoustic shock-wave pulse |
| 09/27/1990 | DE3908050A1 Electronic acoustic signal transmitter |
| 09/20/1990 | WO1990010419A1 Device for generating focussed acoustic wave fields |
| 09/20/1990 | DE3908274A1 Device for generating focused acoustic wave fields |
| 09/19/1990 | EP0387858A1 Apparatus to generate focused acoustic waves |
| 09/12/1990 | EP0387151A1 Horn and plate for hooter, particularly for a motor vehicle, and hooter comprising such a horn or plate |
| 09/12/1990 | EP0386479A2 Shock wave generator |
| 08/29/1990 | EP0383984A1 Shock wave generator |
| 08/21/1990 | US4951271 Sensor for pressure variations in a fluid |
| 07/31/1990 | US4945334 Energizing means for electronic warning apparatus |