| Patents for H04R 7 - Diaphragms for electromechanical transducers; Cones (6,555) |
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| 09/22/1992 | US5149470 Graphite crystals in binder |
| 09/15/1992 | US5148493 Loudspeaker structure |
| 09/15/1992 | US5148492 Diaphragm of dynamic microphone |
| 09/02/1992 | CN1018142B Acoustic material |
| 09/01/1992 | US5143169 Loudspeaker diaphragm provided with a rear load |
| 07/08/1992 | EP0493450A1 Planar speakers |
| 07/08/1992 | CN2109677U Wired (cable) broadcast television compatible device |
| 07/01/1992 | EP0492914A2 Loudspeaker cone and surround assembly |
| 06/30/1992 | US5127060 Centering device for speaker diaphragm |
| 06/30/1992 | US5125473 Speaker damper configuration |
| 06/24/1992 | EP0491139A2 Diaphragm for electroacoustic transducer with discontinuous variation of the aperture angle |
| 06/16/1992 | US5123053 Loudspeaker suspension |
| 05/19/1992 | US5115474 Speaker system |
| 05/06/1992 | EP0483185A1 Electrodynamic sound generator for a hearing aid |
| 05/05/1992 | US5111510 Speaker and manufacturing method therefor |
| 04/30/1992 | WO1992007449A1 Sound output device |
| 04/29/1992 | CN1060754A Ball type vibration membrane loudspeaker |
| 04/15/1992 | EP0480160A2 Dome-shaped high-frequency loudspeaker |
| 04/08/1992 | EP0479317A2 Method of manufacturing a loudspeaker damper and loudspeakerdämper resulting from such method |
| 04/07/1992 | US5102729 Reinforced polyamide |
| 04/01/1992 | EP0477500A2 Diaphragm for cone loudspeaker |
| 03/31/1992 | US5099949 Speaker and manufacturing method therefor |
| 03/25/1992 | CN1016038B Loud speakers |
| 03/24/1992 | US5098976 Polyethylene and paraffin wax blend |
| 03/18/1992 | EP0475208A2 Electroacoustic piezoelectric transducer |
| 02/25/1992 | US5091958 Wiring structure of loudspeaker |
| 02/20/1992 | WO1992003024A1 Panel-form loudspeaker |
| 02/06/1992 | WO1992002108A1 Method for preparing membranes for acoustic applications in particular for loudspeakers, and membranes obtained by such method |
| 02/06/1992 | CA2087432A1 Method for preparing membranes for acoustic applications in particular for loudspeakers and membranes obtained by sudh method |
| 01/16/1992 | DE4021000A1 HI=FI loudspeaker with sprung coupling member - has mechanical oscillation element controlled by movement of electrical conductor within magnetic field |
| 01/15/1992 | CN2093491U Permeable non-woven fabric applicable to audio-frequency apparatus or acoustics |
| 01/14/1992 | US5081684 Shallow loudspeaker with slotted magnet structure |
| 01/14/1992 | US5080743 Process for preparation of a wholly carbonaceous diaphragm for acoustic equipment use |
| 01/12/1992 | WO1992001359A1 Loudspeaker suspension |
| 01/01/1992 | CN2092172U Dual-layer oscillation membrane |
| 12/27/1991 | EP0313560B1 Membrane system with flexion-resistant rotationally symmetric plate for use as a sound reflecting or receiving element |
| 12/17/1991 | US5073946 Thin speaker having an enclosure with an open portion and a closed portion |
| 12/17/1991 | US5072806 Carbon base and silicon carbide surface film; improved sound v elocity and tensile strength |
| 12/15/1991 | WO1991020109A1 Microwave antennas |
| 12/15/1991 | CA2085131A1 Microwave antennas |
| 12/12/1991 | WO1991019408A1 Loudspeaker assembly with multi-cellar diaphragm |
| 12/12/1991 | WO1991019405A1 Loudspeaker with a diaphragm having an air conduit |
| 11/21/1991 | EP0457474A2 Method of producing an acoustic diaphragm |
| 11/19/1991 | CA1292307C Cone loudspeakers |
| 11/14/1991 | WO1991017636A1 Improvements in or relating to loudspeakers |
| 11/13/1991 | CN1056180A Thin-thickness type recording disk reproducing apparatus |
| 11/12/1991 | US5064019 Pyrolytic graphite film with discontinuous resin layer; high strength |
| 10/29/1991 | CA1291558C Diaphragm for loudspeakers |
| 10/15/1991 | US5056617 Diaphragm for loudspeaker |
| 09/18/1991 | EP0446515A2 Dynamic microphone and method of making the same |
| 09/10/1991 | US5047191 Method for manufacturing loudspeaker diaphragm |
| 09/04/1991 | EP0444034A1 Electrodynamic transducer structure |
| 09/04/1991 | EP0441881A4 Shallow loudspeaker with slotted magnet structure |
| 08/28/1991 | CN1013726B Loudspeaker |
| 08/28/1991 | CN1013725B Plate loudspeaker |
| 08/27/1991 | US5043185 Method for fabricating a graphite film for use as an electroacoustic diaphragm |
| 08/21/1991 | EP0441881A1 Shallow loudspeaker with slotted magnet structure. |
| 08/21/1991 | CN1013635B Loudspeaker |
| 07/17/1991 | EP0436615A1 Diaphragm system |
| 07/16/1991 | US5033093 Compact microphone and method of manufacture |
| 07/16/1991 | US5031720 Speaker diaphragm |
| 07/09/1991 | US5031222 Piezoelectric speaker |
| 07/03/1991 | CN1013075B Vibrating diaphragm of loudspeaker |
| 06/28/1991 | EP0444034A4 Electrodynamic transducer structure. |
| 06/25/1991 | US5027411 High frequency loudspeaker |
| 06/18/1991 | US5025474 Speaker system with image projection screen |
| 06/11/1991 | CA1284837C Audio transducer |
| 06/04/1991 | US5022084 Speaker |
| 05/30/1991 | WO1991007742A1 Improved audio transducer with controlled flexibility diaphragm |
| 05/02/1991 | EP0424841A2 Speaker diaphragm and method for making it |
| 05/02/1991 | DE3935786A1 Vibrating part for dume loudspeaker - comprises flexible pliable dome-shaped metallic membrane for middle of high frequency range |
| 04/04/1991 | WO1991004643A1 Planar speakers |
| 04/03/1991 | CN1012316B Wide-band loudspeaker |
| 03/07/1991 | DE3929601A1 Flexible collar retaining edge of loudspeaker diaphragm - has wall thickness related to radial coordinate perpendicular to rotation symmetry axis |
| 03/05/1991 | US4997058 Sound transducer |
| 02/28/1991 | DE4007656C1 Rotationally symmetrical loudspeaker membrane - acts as piston oscillator, its inner edge providing fixing zone for electromagnetic drive acting along membrane axis |
| 02/26/1991 | US4996119 Metal phosphide, boride or carbide reinforced by hot isostatic pressing |
| 02/05/1991 | US4990816 Piezoelectric capsule with resilient conducting holding means |
| 01/29/1991 | US4989254 Electro-acoustic transducer and manufacturing process |
| 01/24/1991 | DE3923189A1 Bass loudspeaker leaving large area of diaphragm free to vibrate - separates flexible connected profile |
| 01/23/1991 | EP0409144A1 Speaker diaphragm and process for producing the same |
| 01/22/1991 | US4987002 Process for forming a crystalline diamond film |
| 01/16/1991 | EP0408329A2 Acoustic vibrational material |
| 01/09/1991 | EP0406832A2 Method of manufacturing an acustic diaphragm |
| 01/07/1991 | WO1991001075A1 Electrodynamic sound generator for a hearing aid |
| 01/07/1991 | CA2062796A1 Electrodynamic sound generator for hearing aid |
| 12/20/1990 | DE4007657C1 Coupling mfg. for loudspeaker - has inner section connector to diaphragm and outer section connected to loudspeaker box |
| 12/18/1990 | US4978880 Piezoelectric capsule with flat supporting surface and resilient holding means |
| 12/13/1990 | DE3918774A1 Verfahren zur herstellung eines diaphragmas fuer einen lautsprecher aus voll kohlenstoffhaltigen materialien Process for the manufacture of a diaphragm for a speaker of fully carbonaceous materials |
| 12/06/1990 | DE3917477A1 Parabolic loudspeaker membrane - is made of aluminium foil and has oscillator coil on outside of membrane |
| 12/04/1990 | US4975965 Loudspeaker design |
| 12/04/1990 | US4975318 Improved acoustic carbon diaphragm |
| 11/22/1990 | EP0398257A2 A speaker diaphragm |
| 11/21/1990 | CN1010543B Loud-speaker diaphragm of simple sound reproducer |
| 11/14/1990 | EP0397621A2 Movable-coil electrodynamic transducer with a diaphragm |
| 11/11/1990 | CA2016478A1 Movable-coil electrodynamic transducer diaphragm |
| 11/06/1990 | US4968551 Acoustic vibrator member and method of manufacturing |
| 10/25/1990 | DE4005849A1 Konuslautsprecher Cone speaker |
| 09/27/1990 | DE3909353A1 Electrodynamic transducer |
| 09/25/1990 | US4959185 Process for producing acoustic carbon diaphragm |