| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 11/13/1979 | US4174111 Compressive pivot suspension system for an electromagnetic cartridge |
| 11/06/1979 | US4173267 Speaker cabinet |
| 11/06/1979 | US4173266 Loudspeaker enclosure |
| 10/31/1979 | EP0005037A2 Acoustic speaker |
| 10/23/1979 | CA1065046A1 Acceleration balanced hydrophone |
| 10/16/1979 | CA1064400A1 Headphone apparatus with reverberation circuits |
| 10/09/1979 | US4170721 Microphone with molded block amplifier electrostatic |
| 10/09/1979 | US4170275 Ear cushion |
| 10/02/1979 | US4169516 Speaker system |
| 09/25/1979 | US4168762 Loudspeaker enclosure |
| 09/25/1979 | US4168761 Symmetrical air friction enclosure for speakers |
| 09/19/1979 | EP0004158A1 Pick-up |
| 09/18/1979 | US4167985 Speaker system |
| 09/11/1979 | US4167223 Mechanically operable acoustic filter |
| 09/11/1979 | CA1062360A1 Suppression of out-of-focus echoes in ultrasonic scanning |
| 09/11/1979 | CA1062169A1 Speaker mounting |
| 09/06/1979 | WO1979000636A1 Acoustic pressure(or charge)regulator |
| 09/04/1979 | US4166933 Rear deck mounting adapter for car speaker |
| 08/28/1979 | US4165797 Adjustable high frequency sound dispersion system |
| 08/28/1979 | CA1061447A1 Electroacoustic projector element |
| 08/21/1979 | US4165195 Recirculating ball bearing spline joint |
| 08/21/1979 | US4164988 Fine tuned, column speaker system |
| 08/14/1979 | US4164631 Horn loudspeaker with acoustic lens |
| 08/14/1979 | CA1060350A1 Omniphonic microphone and loudspeaker system |
| 08/07/1979 | CA1060120A1 Sonic transducer |
| 08/07/1979 | CA1059920A1 Speaker enclosure |
| 07/17/1979 | US4161632 Pneumatic acoustic transducer with ferromagnetic fluid valve |
| 07/17/1979 | US4161230 Loudspeaker equipment |
| 07/17/1979 | US4161122 Apparatus for examining bodies through scanning by means of ultrasound |
| 07/03/1979 | US4160135 Closed earphone construction |
| 07/03/1979 | CA1057669A1 Dual function sound pick-up device |
| 06/26/1979 | US4159472 Electronic buzzer |
| 06/19/1979 | US4158753 Headphone of circumaural design |
| 06/19/1979 | US4158400 Sound reproducing system |
| 06/13/1979 | EP0002413A1 Method and apparatus for recording sound in a room |
| 06/12/1979 | US4157741 Phase plug |
| 05/29/1979 | US4156800 Piezoelectric transducer |
| 05/29/1979 | CA1055401A Loudspeaker system with broad image source |
| 05/22/1979 | US4156118 Audiometric headset |
| 05/22/1979 | US4156117 Speaker system |
| 05/22/1979 | CA1054948A1 Reversible anti-noise microphone |
| 05/15/1979 | US4155066 Transducer structure |
| 05/15/1979 | US4154979 Woofer efficiency |
| 05/15/1979 | CA1054527A1 Electrodynamic transducer with annular gap in flux path |
| 05/08/1979 | CA1053945A1 Vibrating membrane horns |
| 05/01/1979 | US4152690 Flexible transducer mount |
| 05/01/1979 | US4152555 Artificial ear for telephonometric measurements |
| 05/01/1979 | US4152552 Horn speaker and method for producing low distortion sound |
| 05/01/1979 | US4152544 Speaker supporting device |
| 05/01/1979 | US4151971 Speaker mounting system |
| 04/24/1979 | US4151468 Microphone holder attachment and switch control therefor |
| 04/24/1979 | US4151467 Switched microphone hang-up bracket |
| 04/24/1979 | US4151378 Electrostatic microphone with damping to improve omnidirectionality, flatten frequency response, reduce wind noise |
| 04/24/1979 | CA1053156A1 Low range loudspeaker system |
| 04/17/1979 | US4150262 Piezoelectric bone conductive in ear voice sounds transmitting and receiving apparatus |
| 04/17/1979 | US4149610 Acoustic headsets |
| 04/17/1979 | CA1052704A1 Phonograph cartridge replaceable stylus assembly |
| 04/10/1979 | CA1052468A1 Pick up and mounting arm for video disc reproduction |
| 04/03/1979 | US4147904 Microphone with channel selector and push-to-talk button interlock |
| 04/03/1979 | US4147899 Broadband electromagnetic sound source with differently tuned diaphragms |
| 04/03/1979 | US4147229 Vibratile mode speaker cabinet |
| 03/27/1979 | US4146757 Finger ring microphone |
| 03/27/1979 | US4146745 Loudspeaker enclosure with multiple acoustically isolated drivers and a common port |
| 03/27/1979 | US4146744 Low q multiple in phase high compliance driver ported loudspeaker enclosure |
| 03/27/1979 | US4146111 Speaker system |
| 03/27/1979 | US4146110 Speaker apparatus |
| 03/27/1979 | CA1051542A1 Lens transducer for use in marine sonar doppler apparatus |
| 03/27/1979 | CA1051352A1 Acoustical communications headset |
| 03/20/1979 | US4145571 Loudspeaker enclosure with acoustically coupled loudspeaker damper |
| 03/20/1979 | US4144701 Apparatus for setting nip pressure of belts in false twister |
| 03/13/1979 | US4143738 Loudspeaker driver unit |
| 03/13/1979 | CA1050655A1 Microphone apparatus |
| 03/06/1979 | US4143249 Rear deck mounting adapter for car speaker |
| 03/06/1979 | US4142604 Speaker structure |
| 03/06/1979 | US4142603 Adjustable speaker cabinet |
| 03/06/1979 | CA1050154A1 Telephone conferencing apparatus |
| 02/27/1979 | US4142072 Directional/omnidirectional hearing aid microphone with support |
| 02/20/1979 | US4140321 Phonograph cartridge replaceable stylus assembly |
| 02/20/1979 | CA1049135A1 Communications headset with rotatable and tiltable electrical connector |
| 02/20/1979 | CA1049134A1 Stereo microphone apparatus |
| 02/20/1979 | CA1049133A1 Loudspeaker |
| 02/20/1979 | CA1048987A1 Headset hanger |
| 02/13/1979 | US4139744 Reversible hand-held microphone |
| 02/13/1979 | US4139734 Pivoted loudspeaker enclosure with visual indicator of optimum listening position |
| 02/13/1979 | US4139076 Loudspeaker enclosure with enhanched bass response |
| 02/13/1979 | US4139075 Loudspeaker device |
| 02/06/1979 | US4138598 Headset construction |
| 02/06/1979 | US4138594 Small dimension low frequency folded exponential horn loudspeaker with unitary sound path and loudspeaker system including same |
| 02/06/1979 | US4138122 Pickup |
| 02/06/1979 | CA1047943A1 Head phone |
| 01/30/1979 | US4136884 Electromagnet type pickup device |
| 01/23/1979 | US4136265 Hand-held microphone assembly |
| 01/23/1979 | US4135600 Loudspeaker system |
| 01/16/1979 | US4134471 Narrow angle cylindrical wave full range loudspeaker system |
| 01/09/1979 | US4133984 Plug-type hearing device |
| 01/09/1979 | US4133975 Loudspeaker system with broad image source with directionality control for the tweeter |
| 01/09/1979 | US4133243 Electric pickup |
| 01/09/1979 | US4133053 Ear-pads and assembly procedure |
| 01/09/1979 | CA1045985A1 Loudspeaker system with broad image source |
| 01/02/1979 | CA1045559A1 Phonograph pick-up with plurality of piezoelectric elements |