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| Patents for H04R 25 - Deaf-aid sets (22,418) |
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| 01/11/1977 | US4002863 Transducer and method of making same | | 01/04/1977 | US4001694 Automatic gain control circuit arrangements having a plurality of stages of amplification | | 12/14/1976 | US3997849 Push-pull amplifier | | 11/30/1976 | US3995114 Ultra low current amplifier | | 11/02/1976 | US3989904 Method and apparatus for setting an aural prosthesis to provide specific auditory deficiency corrections | | 09/28/1976 | US3983336 Directional self containing ear mounted hearing aid | | 09/07/1976 | US3979567 Microphone coupler for hearing aid having inverted conical end configuration | | 08/24/1976 | US3976848 Disposable noise reducing hearing aid attachment | | 08/17/1976 | US3975599 Non-directional hearing aid | | 06/15/1976 | US3963881 Unidirectional condenser microphone | | 05/04/1976 | US3955024 Epoxy-polyester resin | | 04/20/1976 | US3952158 Ear protection and hearing device | | 03/23/1976 | US3946168 Directional hearing aids | | 01/27/1976 | US3935401 Earpiece for acoustic headset | | 01/27/1976 | US3935398 Transducer with improved armature and yoke construction | | 01/20/1976 | US3934100 Acoustic coupler for use with auditory equipment | | 01/20/1976 | US3934067 Laminar structure having an impregnated fibrous web | | 01/06/1976 | US3930560 Damping element |
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