| Patents for H04R 13 - Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet (404) |
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| 11/03/1998 | US5831938 Lead terminal connection structure of an electroacoustic transducer |
| 11/03/1998 | US5830300 Method of ultrasonic welding for a resin case |
| 10/07/1998 | CN1195208A Improved low distortion low noise microphone |
| 09/23/1998 | CN1193885A Electromagnetic acoustic transducer |
| 09/02/1998 | CN1192117A Electroacoustic transducer |
| 09/01/1998 | US5800663 Terminal connection method of a coil and terminal connection structure of a coil |
| 07/01/1998 | CN1186406A Electromagnetic voice converter |
| 05/05/1998 | US5747906 Electroacoustic transducer |
| 04/15/1998 | CN1038095C Temperature compensation of sound pressure characteristics of electric sound inverter |
| 04/14/1998 | US5737824 Method of manufacturing electroacoustic transducer |
| 03/25/1998 | CN2277153Y Large power hi-fi magnetic circuit device |
| 03/18/1998 | CN1037807C Electroacoustic transducer |
| 02/25/1998 | CN1174486A Method of ultrasonic welding for resin-case |
| 02/24/1998 | US5721785 Small-sized sound generator |
| 01/07/1998 | EP0816053A2 A method of ultrasonic welding for a resin case |
| 12/31/1997 | CN1169093A Miniature electro-acoustic converter |
| 12/17/1997 | CN1168074A Electroacoustic transducer |
| 12/10/1997 | CN1167418A Electro-acoustic conversion device |
| 11/12/1997 | CN1164951A Sounder |
| 10/14/1997 | US5675885 Method of winding a coil for an electroacoustic transducer |
| 08/20/1997 | EP0790752A1 Sounder |
| 06/25/1997 | EP0663116A4 Electromagnetic transducer. |
| 06/25/1997 | CN1152850A Electricity-sound transducer lead-wire terminal connection structure |
| 06/24/1997 | US5642333 Electroacoustic transducer and method of winding coil therein |
| 06/04/1997 | CN1151100A Terminal connection method of coil and terminal connetion structure of coil |
| 05/21/1997 | EP0774880A2 Electroacoustic transducer |
| 04/29/1997 | US5625700 Method of farbicating an electroacoustic transducer |
| 04/29/1997 | US5624155 Electromagnetic transducer |
| 03/13/1997 | WO1997009860A1 Sounder |
| 12/03/1996 | US5581623 Electroacoustic transducer and method of fabricating the same |
| 10/09/1996 | CN1132994A Manufacturing method of electromagnetic sound converter and electronic device using the converter |
| 09/11/1996 | CN1130855A Electromagnetic sound converter and electronic apparatus using same |
| 08/28/1996 | CN1129891A Miniature speeching body |
| 06/18/1996 | US5528697 Integrated vibrating and sound producing device |
| 04/17/1996 | CN1120793A Method of fabricating an electroacoustic transducer |
| 04/10/1996 | EP0706301A2 Small-sized sound generator |
| 04/10/1996 | EP0706300A2 Electroacoustic transducer and electronic equipment using the same |
| 03/27/1996 | CN1119133A Electromagnetic transducer |
| 03/06/1996 | CN1118129A Electracoustic transducer and method of fabricating the same |
| 01/24/1996 | CN1115486A Electro-magnetic acoustic exchanger and method for winding coil of same |
| 12/20/1995 | EP0688144A2 Method of fabricating an electroacoustic transducer |
| 11/14/1995 | US5467323 Electroacoustic transducer |
| 08/30/1995 | EP0669785A1 Electroacoustic transducer and method of winding coil therein |
| 07/19/1995 | EP0663116A1 Electromagnetic transducer |
| 06/13/1995 | US5424592 Electromagnetic transducer |
| 05/16/1995 | US5416751 Electroacoustic transducer |
| 04/26/1995 | EP0650308A1 Electroacoustic transducer and method of fabricating the same |
| 01/19/1995 | WO1995002275A1 Electromagnetic transducer |
| 12/14/1994 | EP0400048B1 Improved audio transducer with controlled flexibility diaphragm |
| 11/09/1994 | EP0623913A2 Electroacoustic transducer |
| 09/14/1994 | CN1092238A Electroacoustic transducer |
| 05/25/1994 | EP0598556A1 Electroacoustic transducer |
| 03/29/1994 | US5299176 Balanced armature transducers with transverse gap |
| 03/02/1994 | CN1083300A Temperature compensation of sound pressure characterastics of electric sound inverter |
| 02/02/1994 | EP0581129A1 Magnet system for electroacoustic transducers |
| 12/29/1993 | EP0576216A2 Method of compensating for a change in sound pressure characteristic with temperature of an electoacoustic transducer |
| 09/28/1993 | CA1322588C Audio transducer with controlled flexibility diaphragm |
| 06/30/1993 | EP0548579A1 Balanced armature transducers with transverse gap |
| 10/22/1991 | US5058569 Apparatus for generating focused shockwaves having a cylindrical coil and a paraboloid of revolution reflector |
| 02/13/1991 | EP0412202A1 Shock wave generator to produce focused shock waves with a reflector shaped as a paraboloid of revolution |
| 01/29/1991 | US4989187 Acoustic apparatus |
| 01/22/1991 | US4987564 Acoustic apparatus |
| 02/20/1990 | US4903308 Audio transducer with controlled flexibility diaphragm |
| 02/13/1990 | US4901357 Electromagnetic transducer |
| 09/26/1989 | CA1261462A1 Audio-frequency electromechanical vibrator |
| 08/24/1989 | WO1989007876A1 Improved audio transducer with controlled flexibility diaphragm |
| 07/05/1989 | EP0322686A2 Acoustic apparatus |
| 07/05/1989 | EP0322679A2 Acoustic apparatus |
| 11/02/1988 | EP0289264A1 Electromagnetic sounding device |
| 10/01/1987 | DE3709461A1 Electrical connector arrangement |
| 07/14/1987 | US4680492 Audio-frequency electromechanical vibrator |
| 10/07/1986 | CA1212451A1 Ceramic microphone |
| 03/25/1986 | US4578808 Electro-acoustic transducers |
| 02/04/1986 | CA1200307A1 Electro-acoustic transducers |
| 01/14/1986 | CA1199398A1 Electromagnetic transducer |
| 12/17/1985 | US4559418 Ceramic microphone |
| 03/12/1985 | CA1183706A1 Electric horn with means for controlling curvature of the striker carrier |
| 12/27/1984 | CA1180099A Device for adjusting a movable electro-acoustic sound transducer |
| 10/02/1984 | CA1175548A1 Telephone transducers |
| 04/25/1984 | EP0106631A1 Ceramic microphone |
| 04/17/1984 | US4443667 Electromagnetic transducer |
| 01/24/1984 | US4427958 Telephone transducers |
| 10/18/1983 | US4410881 Electric horn with means for controlling curvature of the striker carrier |
| 07/06/1983 | EP0083174A1 Electro-acoustic transducers |
| 05/31/1983 | US4386244 Electromagnetic transducer |
| 03/23/1983 | EP0074818A1 Improvements in or relating to telephone transducers |
| 02/01/1983 | CA1140666A1 Electroacoustic device |
| 11/23/1982 | US4360711 Magnetic electro-acoustic transducer construction |
| 11/09/1982 | US4358642 Electro-magnetic type electric acoustic transducer |
| 06/01/1982 | CA1124560A1 Eletromagnetic acoustic transducer with its air gap established at assembly by counteracting springs |
| 05/18/1982 | US4330878 Sound producing device for watches |
| 04/27/1982 | CA1122694A1 Telephone transducer assembly and method of making same |
| 06/16/1981 | CA1103067A1 Composition, processing and devices including magnetic alloy |
| 04/07/1981 | CA1099015A1 Malfunction detector for a dictation system |
| 03/24/1981 | US4258234 Made from an alloy of iron, chromium, and cobalt, and a second alloy of iron and aluminum |
| 03/17/1981 | US4257036 Tone generator |
| 07/03/1979 | US4160132 Electromagnetic acoustic transducer with its air gap established at assembly by counteracting springs |
| 06/26/1979 | US4159472 Electronic buzzer |
| 06/05/1979 | CA1056048A1 Concave diaphragm for electro-acoustic transducer |
| 01/09/1979 | US4133243 Electric pickup |