| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 06/24/1981 | EP0030758A1 An electrodynamic transducer with a mechanical filter |
| 06/02/1981 | US4271490 Ultrasonic detection system |
| 06/02/1981 | CA1102246A1 Phonograph cartridge replaceable stylus assembly |
| 05/28/1981 | WO1981001492A1 Speaker and speaker system |
| 05/26/1981 | US4270023 Cylindrical speaker mechanism |
| 05/26/1981 | US4269416 Head shell for record player tonearms |
| 05/26/1981 | US4269066 Ultrasonic sensing apparatus |
| 05/19/1981 | US4268719 Loudspeaker arrangements |
| 05/19/1981 | US4267993 Arrangement for mounting speaker unit to vehicle panel |
| 05/12/1981 | CA1100884A1 Device for increasing the compliance of a speaker enclosure |
| 05/12/1981 | CA1100883A1 Loudspeaker system using a fluid tight enclosure |
| 05/05/1981 | US4266092 Loudspeaker system with broad image source |
| 05/05/1981 | CA1100621A1 Artificial ear for telephonometric measurements |
| 04/28/1981 | US4264790 Directional microphone |
| 04/28/1981 | US4264789 Voice coil assembly for a speaker |
| 04/28/1981 | CA1100049A1 Speaker system |
| 04/21/1981 | US4263484 Microphone unit |
| 04/14/1981 | US4261432 Airline earphone structure |
| 04/07/1981 | US4260928 Electro-acoustic transducer with horn and reflector |
| 04/01/1981 | EP0025955A1 Piezo-electric ringing transducer |
| 03/31/1981 | US4259550 Acoustic device with floating vibrating means |
| 03/31/1981 | CA1098450A1 Small dimension low frequency folded exponential horn loudspeaker with unitary sound path and loudspeaker system including same |
| 03/24/1981 | US4258235 Pressure gradient electret microphone |
| 03/24/1981 | US4258229 Body vibration pickup |
| 03/24/1981 | US4257325 Mouting of a substantially planar diaphragm defining a sound transducer |
| 03/18/1981 | EP0025118A1 Arrangement for the acoustic reproduction of signals, presented by means of a right and a left stereo-channel |
| 03/17/1981 | US4256930 Loudspeaker having improved magnetic assembly |
| 03/17/1981 | US4256922 Stereophonic effect speaker arrangement |
| 03/17/1981 | US4256917 Anhydrous L-lysine monohydrochloride in α-cyrstalline form and preparation thereof |
| 03/17/1981 | US4256198 Urethane foam absorber |
| 03/11/1981 | EP0024461A1 Loudspeaker arrangement for ceiling and wall mounting and system encasing for electrical apparatuses for ceiling and wall mounting |
| 03/05/1981 | WO1981000661A1 Reproduction of super low frequencies by bass weight |
| 03/05/1981 | WO1981000660A1 Orthodynamic head-phones |
| 03/03/1981 | US4253368 Universal pulsato unit |
| 02/24/1981 | US4252211 Loudspeaker |
| 02/17/1981 | US4251687 Stereophonic sound reproducing system |
| 02/17/1981 | US4251045 Method and apparatus for reducing undesired transmission of acoustic energy from a loudspeaker cabinet and for acoustically isolating high fidelity sets therefrom |
| 02/10/1981 | US4249747 Phonograph pick-up cartridge |
| 02/04/1981 | EP0023435A1 Phonograph pick-up cartridge |
| 02/03/1981 | US4249037 Pyramid loudspeakers with twin cross-phased mid-range speakers |
| 01/27/1981 | CA1094458A1 Speaker cabinet with improved baffle plate |
| 01/21/1981 | EP0022759A1 Support for loudspeaker boxes |
| 01/21/1981 | EP0022544A1 Electrodynamic transducer, in particular for telephonic apparatus |
| 01/13/1981 | US4245136 Monitor ampliphones |
| 01/13/1981 | US4244096 Speaker box manufacturing method |
| 01/07/1981 | EP0021945A1 Monomode fibre-optic hydrophone functioning by the elasto-optic effect |
| 01/07/1981 | EP0021455A1 Loudspeaker enclosure |
| 01/06/1981 | US4243851 Ear cushioning device for headphones |
| 12/30/1980 | US4242744 Fixing of sonic transducer to a container |
| 12/23/1980 | US4241432 Transducer-reflector system |
| 12/23/1980 | US4241241 Electromechanical record disk dynamic range expander |
| 12/16/1980 | US4240003 Apparatus and method for suppressing mass/spring mode in acoustic imaging transducers |
| 12/16/1980 | US4239945 Sealed headphone |
| 12/16/1980 | CA1091588A1 Receiving system having a pre-selected directional rejection characteristic |
| 12/10/1980 | EP0019838A1 Microphone/receiver assembly detachedly securable to a protective helmet |
| 12/09/1980 | US4238646 Pickup cartridge for reproducing signals recorded on a 45--45 stereophonic record disk |
| 12/09/1980 | US4238101 Support stand for high fidelity speaker |
| 12/02/1980 | US4237340 Crossover network for optimizing efficiency and improving response of loudspeaker system |
| 11/25/1980 | US4235301 Folded column speaker enclosure |
| 11/18/1980 | US4234766 Speaker assembly |
| 11/11/1980 | US4233472 Loudspeaker combination, comprising a plurality of dynamic loudspeakers, which are arranged adjacent each other in substantially one continuous plane |
| 11/11/1980 | US4232869 Pickup cartridge |
| 11/04/1980 | US4232205 Microphone mount |
| 11/04/1980 | US4232204 High fidelity loudspeaker |
| 11/04/1980 | US4231446 Resonating chamber |
| 11/04/1980 | US4231445 Acoustic lens speaker cabinet |
| 10/15/1980 | EP0017216A2 Ultrasonic transducer |
| 10/14/1980 | US4228379 Diaphragm type piezoelectric electroacoustic transducer |
| 10/14/1980 | US4227669 Hanger and method for sound speakers |
| 10/14/1980 | US4227590 Grille for loudspeaker cabinet |
| 10/07/1980 | US4227051 Loud speaker and enclosure system |
| 10/07/1980 | US4227050 Virtual sound source system |
| 10/07/1980 | CA1087104A2 Multiple driver loudspeaker system |
| 09/30/1980 | US4225965 Wrist-mounted communication device |
| 09/30/1980 | US4225010 Loudspeaker system |
| 09/23/1980 | US4224470 Headset with limiter circuit |
| 09/23/1980 | US4224469 Stereo speaker system |
| 09/23/1980 | US4224467 Corner mounted sound reproduction speaker apparatus |
| 09/23/1980 | US4223760 Loudspeaker assembly |
| 09/16/1980 | US4223189 Sound dampening earplug mounting device |
| 09/16/1980 | CA1085745A1 Loudspeaker horn |
| 09/16/1980 | CA1085744A1 Loudspeaker system with heat pipe means |
| 09/16/1980 | CA1085742A1 Ear pads with earphones |
| 09/09/1980 | US4221929 Speaker system |
| 09/09/1980 | CA1085504A1 Acoustical transformer for horn-type loudspeaker |
| 09/09/1980 | CA1085308A1 Speaker system |
| 09/03/1980 | EP0015245A1 A sound diffusion plant with very low directivity |
| 09/03/1980 | EP0015186A1 Three-channel acoustic system |
| 09/02/1980 | US4220832 Two-way speaker with transformer-coupled split coil |
| 09/02/1980 | US4220831 Intrusion sensing device |
| 09/02/1980 | US4220341 Pickup |
| 09/02/1980 | US4220220 Loudspeaker equipment |
| 08/26/1980 | US4219099 Acoustic reproduction transducer enclosure |
| 08/19/1980 | US4218591 Phonograph cartridge with very hard metal ceramic frame |
| 08/19/1980 | US4218583 Varying loudspeaker spatial characteristics |
| 08/19/1980 | CA1083972A1 Multiple driver loudspeaker system |
| 08/19/1980 | CA1083971A1 Pivoted loudspeaker enclosure with visual indicator |
| 08/12/1980 | US4216647 Electronic timepiece |
| 08/12/1980 | CA1083489A1 Touch button switch for dictation handset |
| 08/05/1980 | US4215761 Bass sound projection systems |