| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 12/26/1978 | US4131180 Speaker system |
| 12/26/1978 | US4131179 High fidelity speaker system |
| 12/19/1978 | US4130803 Radio equipped protective helmet |
| 12/19/1978 | US4130174 Loudspeaker |
| 12/19/1978 | CA1044610A1 Loudspeaker systems |
| 12/12/1978 | US4129851 Electroacoustic transducer with a magnetostrictive core |
| 12/12/1978 | US4129754 Reporting device |
| 12/12/1978 | US4129752 Shock resistant loudspeaker enclosure |
| 12/05/1978 | US4128738 Compact transmission line loudspeaker system |
| 11/28/1978 | US4127751 Loudspeaker with rigid foamed back-cavity |
| 11/28/1978 | US4127252 Suspension support unit for large objects |
| 11/28/1978 | CA1043270A1 Method and apparatus for electromechanical recording of short wavelength modulation in a metal master |
| 11/28/1978 | CA1043269A1 Stethoscope |
| 11/28/1978 | CA1043268A1 Loudspeaker protective grille |
| 11/21/1978 | US4126827 Steering wheel microphone bracket assembly |
| 11/21/1978 | US4126204 Speaker system |
| 11/21/1978 | CA1042812A1 Sound reproduction system and device |
| 11/07/1978 | US4124783 Phonographic pickup |
| 10/31/1978 | US4123622 Protective cover for sound transducers located in face masks of divers |
| 10/31/1978 | US4123621 Acoustical speaker device |
| 10/31/1978 | US4123067 Stylus vibrating mechanism in pickup cartridge |
| 10/31/1978 | US4122911 Loudspeaker assembly |
| 10/31/1978 | US4122910 Omniphonic microphone and loudspeaker system |
| 10/24/1978 | US4122315 Compact, multiple-element speaker system |
| 10/24/1978 | US4122302 Two way dynamic and electrostatic speaker enclosure with side vent for greater high frequency dispersion |
| 10/17/1978 | US4121060 Touch button switch for dictation handset |
| 10/10/1978 | US4119799 Critical alignment loudspeaker system |
| 10/10/1978 | CA1040106A1 Multi-way speaker system |
| 10/03/1978 | US4118606 Acoustical voice transmitting headset |
| 09/26/1978 | US4117275 Non-directional electret microphone with an air passage to balance pressures on opposite sides of the diaphragm |
| 09/26/1978 | US4116302 Horn loudspeaker |
| 09/19/1978 | US4114896 Phonographic pick-up cartridge |
| 09/12/1978 | US4113999 Hand held communications microphone |
| 09/05/1978 | US4112411 Device for echography by means of focussed ultrasonic beams |
| 09/05/1978 | US4112256 Loudspeaker and stereophonic loudspeaker system |
| 08/29/1978 | US4110583 Earphone construction |
| 08/29/1978 | US4110017 Low-frequency sound program generation |
| 08/29/1978 | US4109983 Speaker cabinet |
| 08/22/1978 | US4109116 Hearing aid receiver with plural transducers |
| 08/22/1978 | US4109105 Earphone mounting in safety helmet for motorcycle riders |
| 08/22/1978 | CA1036947A1 Water-proof sound apparatus |
| 08/15/1978 | US4107479 Electro-acoustic transducer |
| 08/15/1978 | CA1036503A1 Special effects generation and control system for motion pictures |
| 08/08/1978 | US4104945 Sound resonator for amplifying sound waves |
| 07/25/1978 | US4103116 Pickup cartridge with moving magnet armature |
| 07/18/1978 | US4101865 Sonic echo-sounder for the measurement of levels of substances |
| 07/18/1978 | US4101736 Device for increasing the compliance of a speaker enclosure |
| 07/18/1978 | US4101109 Loudspeaker harness |
| 07/18/1978 | US4100653 Device for attaching a microphone-speaker to an article of clothing |
| 07/11/1978 | US4100372 Audio console system for home and vehicle |
| 07/11/1978 | US4100371 Loudspeaker system with phase difference compensation |
| 07/04/1978 | US4099026 Loudspeaker for vehicles |
| 07/04/1978 | US4098370 Vibration masking noise system |
| 06/06/1978 | US4093833 Moving coil cartridge with magnetic means to affix stylus holder to cartridge casing |
| 05/30/1978 | US4091962 Panel hole closure |
| 05/30/1978 | US4091891 Horn speaker |
| 05/23/1978 | US4091067 Process for producing an aural communications receiving device |
| 05/23/1978 | US4090582 Speaker protector |
| 05/16/1978 | US4090044 Container for positioning a disinfectant-impregnated member in a telephone mouthpiece |
| 05/16/1978 | US4090042 Acoustical communications headset |
| 05/16/1978 | US4090040 Hearing aid with acoustical frequency response modification |
| 05/16/1978 | US4090039 Electrodynamic transducer |
| 05/09/1978 | US4088915 Curved polymeric piezoelectric electro-acoustic transducer |
| 05/09/1978 | US4088849 Headphone unit incorporating microphones for binaural recording |
| 05/02/1978 | US4087652 Microphone switch key |
| 05/02/1978 | US4087631 Projected sound localization headphone apparatus |
| 04/25/1978 | US4086445 Telephone handset transmitter with improved output response |
| 04/18/1978 | US4085289 Loudspeaker system |
| 04/11/1978 | US4083426 Loud speaker apparatus |
| 04/04/1978 | US4082159 Ceramic speaker enclosure |
| 03/28/1978 | US4081628 Microphone, particularly for body sounds, with slip coupling to the transducer element |
| 03/07/1978 | US4078155 Telephone apparatus for use in a conference room |
| 02/28/1978 | US4076097 Augmented passive radiator loudspeaker |
| 02/21/1978 | US4074883 Speaker mounting system |
| 02/14/1978 | US4074224 Acoustic wave transducer with automatic compensation of the static pressure variations |
| 02/14/1978 | US4073365 Speaker system |
| 02/07/1978 | US4072831 Voice transmitting apparatus for a breathing mask |
| 02/07/1978 | US4072829 Attachment for loudspeaker |
| 01/31/1978 | US4071717 Headphone earpiece |
| 01/31/1978 | US4071112 Horn loudspeaker |
| 01/31/1978 | US4071111 Weatherproof loudspeaker assembly and method of making same |
| 01/31/1978 | US4071110 Underwater voice communicator |
| 01/24/1978 | US4070553 Personal audio listening system |
| 01/24/1978 | US4070547 One-point stereo microphone |
| 01/24/1978 | US4070546 Portable stereo audio apparatus |
| 01/17/1978 | US4069467 Suppression of out-of-focus echoes in ultrasonic scanning |
| 01/17/1978 | US4069401 Acoustical frictional resistance construction and apparatus for manufacturing an acoustical resistance and an associated magnetic system |
| 01/10/1978 | US4068209 Electroacoustic transducer for deep submersion |
| 01/10/1978 | US4068103 Loudspeaker solderless connector system and method of setting correct pigtail length |
| 01/10/1978 | US4068091 Binaural sound pickup |
| 01/10/1978 | US4067582 Stylus suspension |
| 01/03/1978 | US4066849 Rotary-type control for headphone earpiece |
| 12/27/1977 | US4065648 Microphone screen |
| 12/27/1977 | US4065645 Headset |
| 12/27/1977 | US4064966 Loudspeaker apparatus |
| 12/27/1977 | US4064781 Guitar pick |
| 12/20/1977 | US4064376 Sound reproduction system and device |
| 12/20/1977 | US4063614 Combination loudspeaker and sign holder |
| 12/20/1977 | US4063387 Hanging planter pot speaker enclosure |
| 12/13/1977 | US4063285 Pickup device with a composite compliance arm |