| Patents for H04R 7 - Diaphragms for electromechanical transducers; Cones (6,555) |
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| 04/03/1979 | US4147899 Broadband electromagnetic sound source with differently tuned diaphragms |
| 03/27/1979 | US4146756 Moving voice coil transducer with diaphragm having concentric sections of opposite curvature |
| 03/06/1979 | CA1050156A1 Membrane for electroacoustic converter systems |
| 02/20/1979 | US4140203 Tetramethylene glycol, ethylene glycol, diphenylmethane diisocyanate/4,4*-/, polyetherurethane copolymers, frequency response, efficiency, tensile strength, loudspeakers |
| 02/13/1979 | US4139733 Electro acoustic transducer with improved diaphragm |
| 02/06/1979 | CA1048088A1 Noise reduction device for a chain drive mechanism |
| 01/23/1979 | US4135601 Boron coated diaphragm for use in a loud speaker |
| 01/02/1979 | US4132872 Ribbed conical-central dome diaphragm with tapered thickness components |
| 12/12/1978 | US4129195 Porous metal |
| 12/05/1978 | US4128138 Diaphragm for speaker |
| 11/28/1978 | US4127749 Microphone capable of cancelling mechanical generated noise |
| 11/21/1978 | US4126769 Moving armature transducer with reinforced and pivoted diaphragm |
| 11/14/1978 | CA1042544A2 Broad-band acoustic speaker |
| 11/14/1978 | CA1042543A2 Broad-band acoustic speaker |
| 10/24/1978 | US4122314 Loudspeaker having a laminate diaphragm of three layers |
| 09/19/1978 | US4115667 Loudspeaker voice coil bearing |
| 09/05/1978 | US4112168 High stiffness speaker cone |
| 08/15/1978 | US4107479 Electro-acoustic transducer |
| 08/08/1978 | US4105877 Electrostatic loudspeaker having elastic diaphragm spacer elements cured in situ |
| 07/18/1978 | US4100992 Loudspeaker |
| 04/25/1978 | US4086450 Variable thickness cone for a dynamic speaker and quality control inspection method therefor |
| 04/25/1978 | US4086449 Pulp fibers, condensation product of ammonium polyphosphate and polyethyleneimine, neoprene rubber latex |
| 04/18/1978 | US4085297 Spring force biasing means for electroacoustical transducer components |
| 03/28/1978 | US4081627 Electromagnetic bipolar loud speaker |
| 03/28/1978 | US4081626 Electrostatic transducer having narrowed directional characteristic |
| 02/28/1978 | US4076098 Loudspeaker diaphragm |
| 12/20/1977 | US4064365 Loudspeaker assembly with restructured diaphragm including a tweeter driven by a bass amplifier |
| 12/13/1977 | US4063049 Piezoelectric electroacoustic transducer |
| 12/06/1977 | US4061890 Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate |
| 11/08/1977 | US4057694 Speaker diaphragm having flat response curve |
| 11/01/1977 | US4056697 Movable diaphragm connector method flexible hinge diaphragm surround and electro-acoustic transducer with folded diaphragm with intermediate flexible portions |
| 08/16/1977 | US4042438 Method of assembling a diaphragm assembly for an electro-acoustic transducer |
| 08/02/1977 | US4039044 Low frequency electro-acoustic transducer with interconnected diaphragms interleaved with fixed diaphragms |
| 07/05/1977 | US4033180 Ultrasonic microphone for operating with an accumulated layer of mud over its vibratile surface without change in sensitivity within its prescribed frequency range |
| 06/14/1977 | US4029911 Electro-acoustic transducer and method of manufacturing such a transducer |
| 06/14/1977 | US4029910 Wide dispersion loudspeaker with flexing diaphragm |
| 06/14/1977 | US4029171 Membrane for electroacoustic converter systems |
| 05/31/1977 | US4026384 Reconstituted mica acoustic diaphragm |
| 05/17/1977 | US4024355 Piezoelectric electro-acoustic transducer with non-uniform backing |
| 04/26/1977 | US4020299 Electro-acoustic transducer diaphragms |
| 04/05/1977 | US4016376 Concave diaphragm for electro-acoustic transducer |
| 01/25/1977 | US4004409 Watch having a piezo electric buzzer mechanism |
| 01/18/1977 | US4003449 Planar diaphragm |
| 12/14/1976 | US3997023 Loudspeaker with improved surround |
| 10/12/1976 | US3985201 Infinite sound reproduction chamber |
| 09/28/1976 | US3983337 Broad-band acoustic speaker |
| 09/14/1976 | US3980841 Speaker edge |
| 05/25/1976 | US3958662 Tensioned diaphragm mounting for an electroacoustic transducer |
| 05/04/1976 | US3955055 Dynamic loudspeaker |
| 03/30/1976 | US3946832 Diaphragm for loud speaker |
| 02/24/1976 | US3940576 Loudspeaker having sound funnelling element |
| 02/24/1976 | US3939942 Electroacoustic transducers |
| 02/10/1976 | US3937905 Moving voice coil transducer having a flat diaphragm of an impregnated knit |
| 02/03/1976 | US3935924 Vibratory material of paper pulp and carbon fibers |
| 01/27/1976 | US3935400 Oval dome type speaker |