| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 12/13/1977 | US4063214 Lens transducer for use in marine sonar doppler apparatus |
| 12/06/1977 | USRE29487 Earplugs |
| 12/06/1977 | US4061934 Vibration pickup unit for sensing vibrations of musical instruments and the like |
| 12/06/1977 | US4061877 Speaker system |
| 11/29/1977 | US4060697 Microphone mounting and control system |
| 11/22/1977 | US4059491 Diluents for rubella virus hemagglutination-inhibition test |
| 11/15/1977 | US4058688 Headphone |
| 11/08/1977 | US4057689 High fidelity sound reproduction system and modules thereof |
| 11/08/1977 | US4057124 Sound suppressor |
| 11/01/1977 | US4056165 Sound reproducing apparatus in the inside of a car |
| 10/25/1977 | US4055233 Ear coupler |
| 10/18/1977 | US4054808 Vibration detecting device having a piezoelectric ceramic plate and a method for adapting the same for use in musical instruments |
| 10/18/1977 | US4054758 Mounting of pickup stylus |
| 10/18/1977 | US4054750 Full range rotatable speaker housing with oppositely directed speakers |
| 10/18/1977 | US4054748 Cardioid electro-acoustic radiator |
| 10/11/1977 | US4053721 Piezoelectric type pickup cartridge for stereo with pressing and intermediate members for coupling |
| 10/04/1977 | US4052561 Lectern with detent-hinged shelf for portable sound system |
| 10/04/1977 | US4051919 High fidelity speaker enclosure |
| 09/27/1977 | US4051330 Hearing aid having adjustable directivity |
| 09/27/1977 | US4050541 Acoustical transformer for horn-type loudspeaker |
| 09/13/1977 | US4048454 Sonic transducer employing rigid radiating member |
| 09/13/1977 | US4047684 Adjustable tilter device used for holding objects such as musical instruments |
| 09/06/1977 | US4047060 Acoustic transducer with elastomeric coupling |
| 08/30/1977 | US4044855 Loudspeaker device |
| 08/23/1977 | US4044379 Method and apparatus for electromechanical recording of short wavelength modulation in a metal master |
| 08/23/1977 | US4044273 Ultrasonic transducer |
| 08/16/1977 | US4042845 Transducer assembly and method for radiating and detecting energy over controlled beam width |
| 08/16/1977 | US4042782 High selectivity radio receiver |
| 08/16/1977 | US4042779 Coincident microphone simulation covering three dimensional space and yielding various directional outputs |
| 08/16/1977 | US4042778 Collapsible speaker assembly |
| 08/16/1977 | US4042307 Joining |
| 08/09/1977 | US4041256 Open-back type headphone with a detachable attachment |
| 08/09/1977 | US4041251 Hearing aid to be worn behind the ear of the user and provided with a pressure-gradient microphone |
| 08/09/1977 | US4040547 Apparatus for holding a microphone |
| 08/09/1977 | US4040503 Horn speaker |
| 08/02/1977 | US4039044 Low frequency electro-acoustic transducer with interconnected diaphragms interleaved with fixed diaphragms |
| 07/26/1977 | US4038502 Acoustic coupling structure for microphone |
| 07/26/1977 | US4038500 Microphone coupler |
| 07/19/1977 | US4037064 Stereo microphone apparatus |
| 07/19/1977 | US4037052 Sound pickup assembly |
| 07/19/1977 | US4037051 Flat baffle speaker system having improved crossover |
| 07/19/1977 | US4036464 Headset hanger |
| 07/12/1977 | US4035590 Apparatus for electromechanical recording of short wavelength modulation in a metal master |
| 07/05/1977 | US4034165 Transducer with rearwardly disposed damping elements |
| 07/05/1977 | US4033431 Acoustic crossover speaker enclosure |
| 07/05/1977 | US4033430 Speaker enclosure |
| 06/28/1977 | US4032725 Speaker mounting |
| 06/21/1977 | US4031503 Anti-corrosion ultrasonic transducer |
| 06/21/1977 | US4031418 Low frequency acoustical piezo-electric transducer |
| 06/21/1977 | US4031337 Loudspeaker |
| 06/21/1977 | US4031318 High fidelity loudspeaker system |
| 06/21/1977 | US4030564 Loud speaker with stable damping |
| 06/21/1977 | US4030563 Speaker system of cubic configuration |
| 06/14/1977 | US4029170 Radial sound port speaker |
| 06/07/1977 | US4028504 Acoustic amplifier combined with transducer shock mount |
| 06/07/1977 | US4028491 Transducer switching system |
| 05/31/1977 | US4027117 Headphone |
| 05/31/1977 | US4027116 Headphone |
| 05/31/1977 | US4027115 Electroacoustic sound generator |
| 05/31/1977 | US4027113 Headphone |
| 05/31/1977 | US4027112 Head-rest and loudspeaker combination |
| 05/31/1977 | US4027111 Ribbon loudspeaker |
| 05/24/1977 | USRE29232 Magnetic stereophonic phonograph pickup |
| 05/24/1977 | US4025734 Ambient noise shielded ear transceiver |
| 05/17/1977 | US4024355 Piezoelectric electro-acoustic transducer with non-uniform backing |
| 04/26/1977 | US4020297 Adjustable headset |
| 04/26/1977 | US4020284 Speaker system |
| 04/26/1977 | US4019708 Latchable swivel mount for loudspeaker |
| 04/12/1977 | US4017797 Headset for receiving and transmitting signals |
| 04/12/1977 | US4017685 Planetary acoustic phase shift mechanism |
| 04/12/1977 | US4016953 Push-pull transducer system |
| 03/29/1977 | US4015227 Electromagnetic transducer |
| 03/29/1977 | US4015089 Linear phase response multi-way speaker system |
| 03/29/1977 | US4014597 Speaker enclosures |
| 03/22/1977 | US4013992 Diver's piezoelectric microphone with integral agc preamplifier |
| 03/15/1977 | US4012605 Input/output transducer with damping arrangement |
| 03/15/1977 | US4011925 Stethoscope |
| 03/08/1977 | US4010821 Omnidirectional sympathetically driven sound reproduction device |
| 03/01/1977 | US4010335 Microphone apparatus |
| 03/01/1977 | US4010334 Moving magnet contact acoustic transducer |
| 03/01/1977 | US4009885 Stereo phonograph pick-up cartridge |
| 02/22/1977 | US4009355 Reversible anti-noise microphone |
| 02/15/1977 | US4008408 Piezoelectric electro-acoustic transducer |
| 02/15/1977 | US4008374 Loudspeaker systems |
| 02/08/1977 | US4006796 Earpiece which substantially consists of a thin-walled flexible capsule filled with a liquid medium |
| 02/01/1977 | US4006371 Electroacoustical transducer comprising piezoelectric element |
| 02/01/1977 | US4006318 Inertial microphone system |
| 02/01/1977 | US4006317 Electrostatic transducer and acoustic and electric signal integrator |
| 02/01/1977 | US4006311 Stereophonic sound reproducing apparatus |
| 02/01/1977 | US4006308 Loudspeaker arrangement |
| 02/01/1977 | US4005761 Car loud speaker |
| 01/25/1977 | US4005278 Headphone |
| 01/25/1977 | US4005267 Arrangement for converting oscillations in headphones |
| 01/25/1977 | US4004309 Hydrodynamic stabilizing device |
| 01/18/1977 | US4004229 Ear attachable miniaturized radio receiver |
| 01/18/1977 | US4004094 Enclosure system for sound generators |
| 01/11/1977 | USRE29113 Triangular piezoelectric transducer for recording video information |
| 01/11/1977 | US4002863 Transducer and method of making same |
| 01/11/1977 | US4002859 Multi-mode electrostatic microphone construction |
| 01/04/1977 | US4001519 Pick-up cartridges for gramophone records |